This document presents metadata that supports the mission of the National Oceanic and Atmospheric Administration (NOAA) for acquisition, archiving, and dissemination of ocean passive acoustic data.
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Introduction

Passive acoustics is a rapidly emerging field of marine biology that since recently has received a lot of attention from fisheries scientists and managers. Passive Acoustic Monitoring (PAM) can serve as a useful monitoring tool that complements traditional survey methodologies (aerial, visual, trawl, etc.).

Many biologists that are interested in documenting marine animals and fish habitat and following their movements and behavior have used acoustic tags. However, because marine mammals and many fish species are highly adapted for producing and perceiving sounds in the ocean, these low-frequency (<10 kHz), species-specific sounds can be used as natural acoustic tags, and passive acoustic approach (monitoring sound-producing fish species with hydrophones) show great promise for gathering data in a noninvasive and continuous manner.

Passive acoustic methods include the use of low-frequency hydrophones, digital recorders, autonomous recording sonobuoys and data loggers, and towed hydrophone arrays to record fish sounds. These monitoring and recording devices can continuously gather data in conditions that would otherwise limit survey effort. The data gathered from these units provides scientists with information on the acoustic presence of a species of interest with known species specific signals.

In the light of increasing activities around passive acoustic monitoring and mounting demands to incorporating PAM data into habitat modeling and marine spatial planning, the U.S. IOOS, among other goals, aim to improve interoperability of PAM data among various data centers by means of enhanced and standardized acoustic metadata.

Background

Metadata is data that describes data. A metadata convention is a systemic set of metadata attributes that have been developed to describe a particular genre or type of data. This document attempts to create a host metadata list that is necessary to describe passive acoustic datasets from various platforms and sensors from NOAA’s different line offices. The metadata list will further be used to develop a “machine-readable” metadata template to be tested among passive acoustic data holders and the community. Hopefully it will eventually be adopted as the NOAA metadata standard for passive acoustic recordings. The terms “metadata convention” and “metadata standard” are often used interchangeable. This document details a “convention” which may be followed, as against a “standard” that is more stringent and must be adhered to. The goal of the eventual development of such a standard will facilitate discovery and exchange of passive acoustic recording data while ensuring its archivability and longevity.

Summary of Metadata Categories

Mission / project metadata

This is the metadata that gives a high level description of the overarching initiative (e.g., mission, project, ocean observing system) under which passive acoustic data are collected.

Platform metadata

This metadata set includes vessel, glider, drifting buoy, and fixed platform (buoy-moored sensor, suspended sensor, and bottom-mounted sensor, etc.). This metadata describes the platform used to collect passive acoustic data.

Recording equipment metadata

This metadata include instruments involved in passive acoustic data collection. The category includes instrumentation, which describes a collection of the instrument package, and each separate component of the instrument package: hydrophone / sensor, pre-amplifier, analogue/digital converter, and recorder.


Definition of Attributes for Passive Acoustic Recordings Metadata

Category I: Mission and Project

Metadata name Definition Data type [1] Unit Authority
project_ID ID number of mission or project, if exists S    
project_name Name of mission or project S    
project_abstract Free text description of the mission or project, its purpose, scientific objectives and area of operation. Other instruments and experiments within the mission or project which may or may not relate directly to the passive acoustic data can be included S    
project_purpose Free text description of the purpose or objective of the project or mission      
data_acknowledgement Any users (including re-packagers) of this data are required to clearly acknowledge the source of the material in this format. E.g., acknowledge contribution of the datasets S    
principal_investigator Name of the principal investigator in charge of the mission or project S    
organizationName Name and address of the organization, facility, or agency where the original data were produced S   ISO 19115-2:2009(E)
principal_investigator_position Position and title of the principal investigator S    
principal_investigator_phone Principal investigator’s phone number S    
principal_investigator_fax Principal investigator’s facsimile number S    
principal_investigator_address Principal investigator’s address line S    
principal_investigator_city Principal investigator’s address city S    
principal_investigator_state Principal investigator’s state/province or region S    
principal_investigator_zip Principal investigator’s ZIP or postal code S    
principal_investigator_country Principal investigator’s country S    
principal_investigator_email Principal investigator’s e-mail address S    
contact_instruction Description on how to contact the PI for data S    
data_update_frequency How often the acoustic data get updated N    
last_data_update The date when acoustic data were updated N    
data_update_note Notes for data updates S    
data_center_contact_name Name of the contact person at the data center S    
data_center Data center in charge of the data management or party who distributed the resource S    
data_center_contact_position Position and title of the contact person at the data center S    
data_center_phone Data center phone number S    
data_center_fax Data center facsimile number S    
data_center_address Address line of the data center S    
data_center_city City where the data center is located S    
data_center_state State or province where the data center is located S    
data_center_zip ZIP code or postal code of the data center S    
data_center_country Country where the data center is located S    
data_center_e-mail e-mail address of the data center S    
data_center_website Web site of the data center      
data_center_hours Hours of service of the data center S    
contact_instruction_data_center Description on how to contact the data center S    
data_file_name File name of the acoustic data      
data_file_version File version of the acoustic data      
data_type Type of acoustic data (.wav, mp3, etc.)      
compression_technique Acoustic data compression technique, if any      
ambient_noise Place keyword for ambient noise      
animal_sound Place keyword for animal sound      
anthropogenic_noise Place keyword for anthropogenic noise      
Pacific_Ocean Place keyword for Pacific Ocean     GCMD, keywords vs 8.0
Atlantic_Ocean Place keyword for Atlantic Ocean     GCMD, keywords vs 8.0
Arctic_Ocean Place keyword for Arctic Ocean     GCMD, keywords vs 8.0
Indian_Ocean Place keyword for Indian Ocean     GCMD, keywords vs 8.0
place Keywords for places      
vessel Platform keyword for vessel      
glider Platform keyword for glider     IOOS Platform Vocabulary
drifting_buoy Platform keyword for drifting buoy     IOOS Platform Vocabulary
moored_buoy Platform keyword for moored buoy     IOOS Platform Vocabulary
bottom_mounted Platform keyword for bottom-mounted platform      
platform Keywords for platforms     IOOS Platform Vocabulary
hydrophone_pressure_sensor Instrument keyword for pressure sensor hydrophone      
hydrophone_vector_sensor Instrument keyword for vector sensor hydrophone      
preamplifier Instrument keyword for pre-amplifier      
AD_converter Instrument keyword for A/D converter      
recorder_analogue Instrument keyword for analogue recorder      
recorder_digital Instrument keyword for digital recorder      
other_signal_conditioning Instrument keyword for other signal conditioning devices      
instrument Keywords for instrument      
NEFSC dataCenter keyword for NEFSC      
SEFSC dataCenter keyword for SEFSC      
NWFSC dataCenter keyword for NWFSC      
SWFSC dataCenter keyword for SWFSC      
AFSC dataCenter keyword for AFSC      
PIFSC dataCenter keyword for PIFSC      
dataCenter Keywords for data centers      
data_restriction Restriction of data distribution S    
language Language S    
project_area_description Description of the project area S    
project_geospatial_longitude_minimum Westernmost longitude of bounding box. A value between -180 and 180 decimal degrees East. Note it is possible for the numeric value of the “geospatial longitude maximum” to be less than the numeric value of the “geospatial longitude minimum.” In that instance the bounding box will have crossed the 180 degree longitude boundary between West and East. N degrees_east CF
project_geospatial_longitude_maximum Easternmost longitude of bounding box. A value between -180 and 180 decimal degrees East. Note it is possible for the numeric value of the “geospatial longitude maximum” to be less than the numeric value of the “geospatial longitude minimum.” In that instance the bounding box will have crossed the 180 degree longitude boundary between West and East. N degrees_east CF
project_geospatial_latitude_minimum Southernmost latitude of bounding box. A value between -90 and 90 decimal degrees North N degrees_north CF
project_geospatial_latitude_maximum Northernmost latitude of bounding box. A value between -90 and 90 decimal degrees North. N degrees_north CF
project_start_date Start data of mission or project in ISO 8601 format including local time zone. For example, a local time of 18:00 on the 24th of October 2008 would be represented as 2008-10-24T08:00:00Z+10 (local). S    
project_end_date As per mission_start_date S    
minimum_sensor_depth Minimum sensor depth in m      
maximum_sensor_depth Maximum sensor depth in m      
         
supplemental_info Additional info      

Category II: Platform

Metadata name Definition Data type [1]
vessel_id ID number of the vessel, if it exists S
acoustic_sampling_start_date Start data of acoustic data collection in ISO 8601 format including local time zone. For example, a local time of 18:00 on the 24th of October 2008 would be represented as 2008-10-24T08:00:00Z+10 (local).  
platform_detail Free field provide detailed description of the platform, include tow speed (for towed hydrophone or hydrophone array), number of sensors, array directivity in housing, array geometry, array beamwidth, platform noise signature, platform synchronization, and platform manufacture date, etc.  
     
glider_name Name of the glider that was used to collect passive acoustic data. S
glider_id ID number of the glider, if it exists S
acoustic_sampling_start_date Start data of acoustic data collection in ISO 8601 format including local time zone. For example, a local time of 18:00 on the 24th of October 2008 would be represented as 2008-10-24T08:00:00Z+10 (local).  
platform_detail Free field provide detailed description of the platform, include number of sensors, array directivity in housing, array geometry, array beamwidth, platform noise signature, platform synchronization, and platform manufacture date, etc.  
     
drifting_buoy_name Name of the drifting buoy that was used to collect passive acoustic data. S
drifting_buoy_id ID number of the drifting buoy, if it exists S
acoustic_sampling_start_date Start data of acoustic data collection in ISO 8601 format including local time zone. For example, a local time of 18:00 on the 24th of October 2008 would be represented as 2008-10-24T08:00:00Z+10 (local).  
platform_detail Free field provide detailed description of the platform, include tow speed (for towed hydrophone or hydrophone array), number of sensors, array directivity in housing, array geometry, array beamwidth, platform noise signature, platform synchronization, and platform manufacture date, etc.  
     
moored_buoy_name Name of the moored buoy that was used to collect passive acoustic data. S
moored_buoy_id ID number of the moored buoy, if it exists S
acoustic_sampling_start_date Start data of acoustic data collection in ISO 8601 format including local time zone. For example, a local time of 18:00 on the 24th of October 2008 would be represented as 2008-10-24T08:00:00Z+10 (local).  
platform_detail Free field provide detailed description of the platform, include tow speed (for towed hydrophone or hydrophone array), number of sensors, array directivity in housing, array geometry, array beamwidth, platform noise signature, platform synchronization, and platform manufacture date, etc.  
     
suspended_platform_name Name of the suspended platform that was used to collect passive acoustic data. S
suspended_platform_id ID number of the suspended platform, if it exists S
acoustic_sampling_start_date Start data of acoustic data collection in ISO 8601 format including local time zone. For example, a local time of 18:00 on the 24th of October 2008 would be represented as 2008-10-24T08:00:00Z+10 (local).  
platform_detail Free field provide detailed description of the platform, include tow speed (for towed hydrophone or hydrophone array), number of sensors, array directivity in housing, array geometry, array beamwidth, platform noise signature, platform synchronization, and platform manufacture date, etc.  
     
bottom_mounted_platform_name Name of the bottom-mounted platform that was used to collect passive acoustic data. S
bottom_mounted_platform_id ID number of the bottom-mounted platform, if it exists S
acoustic_sampling_start_date Start data of acoustic data collection in ISO 8601 format including local time zone. For example, a local time of 18:00 on the 24th of October 2008 would be represented as 2008-10-24T08:00:00Z+10 (local).  
platform_detail Free field provide detailed description of the platform, include tow speed (for towed hydrophone or hydrophone array), number of sensors, array directivity in housing, array geometry, array beamwidth, platform noise signature, platform synchronization, and platform manufacture date, etc.  

Category III: Recording Equipment (sensor, pre-amplifier, A/D converter, additional signal conditioning)

Metadata name Definition Data type [1] Units Authority
hydrophone_type pressure sensor or vector sensor S    
hydrophone_id ID number of the hydrophone if it exists      
hydrophone_maker_model Maker or manufacture of the hydrophone that was used to collect passive acoustic data      
hydrophone_sensitivity Sensitivity of hydrophone and calibration method N    
calibration_date        
other_info List noise floor, directivity, and resonance frequency of hydrophone N    
         
preamplifier_id ID number of the pre-amplifier if it exists      
preamplifier_maker_model Maker or manufacture of the preamplifier that was used to collect passive acoustic data      
preamplifier_gain For pre-amplifier, A/D converter, and signal conditioning only N    
other_info Other info related to the pre-amplifier, such as noise floor, low- and high-pass filter specification, etc., if available.      
         
AD_converter_id ID number of the AD converter if it exists      
AD_converter_maker_model        
sample_rate        
other_info Additional info related to the AD converter, such as gain, noise floor, and bit rate, etc.      
         
recorder_type analogue vs. digital recorder S    
recorder_id ID number of the recorder if it exists      
recorder_maker_model Maker or manufacture of the recorder that was used to collect passive acoustic data      
recorder_gain Signal gain of the recorder N    
other_info Additional info related to the recorder, such as noise floor, etc.      
         
additional_signal_con_type Types of additional signal conditioning device, if available S    
device_id ID number of the instrument if it exists      
device_maker_model Maker or manufacture of the device that was used to collect passive acoustic data      
device_function Functionality of the device      
other_info Additional info related to the device, such as signal gain, noise floor, etc. N    

ISO 19115 XML Template for NOAA Passive Acoustic Recordings


<!-- <gmd:metadataStandardName>
     <gco:CharacterString>METADATA CONVENTION FOR IOOS PASSIVE ACOUSTIC RECORDINGS</gco:CharacterString>
     version 1.0 2013/08/13 Shane Guan (NMFS, Silver Spring, MD), Hassan Moustahfid (US IOOS, Silver Spring, MD) and Anna Milan (NOAA NGDC, Boulder, CO), Jacqueline Mize (NOAA NCDDC, Stennis, MS)-->

<?xml-stylesheet type="text/css" href="http://www.ngdc.noaa.gov/metadata/published/views/ISO.css"?>
<gmi:MI_Metadata xmlns:gmi="http://www.isotc211.org/2005/gmi" xmlns:gmd="http://www.isotc211.org/2005/gmd" xmlns:gco="http://www.isotc211.org/2005/gco" xmlns:xlink="http://www.w3.org/1999/xlink" xmlns:gml="http://www.opengis.net/gml/3.2" xmlns:srv="http://www.isotc211.org/2005/srv" xmlns:gmx="http://www.isotc211.org/2005/gmx" xmlns:gss="http://www.isotc211.org/2005/gss" xmlns:gsr="http://www.isotc211.org/2005/gsr" xmlns:gts="http://www.isotc211.org/2005/gts" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://www.isotc211.org/2005/gmi http://www.ngdc.noaa.gov/metadata/published/xsd/schema.xsd">
  <gmd:fileIdentifier>
    <gco:CharacterString>project_ID</gco:CharacterString>
  </gmd:fileIdentifier>
  <gmd:language>
    <gco:CharacterString>eng; USA</gco:CharacterString>
  </gmd:language>
  <gmd:contact>
    <gmd:CI_ResponsibleParty>
      <gmd:individualName>
        <gco:CharacterString>template</gco:CharacterString>
      </gmd:individualName>
      <gmd:organisationName>
        <gco:CharacterString>template</gco:CharacterString>
      </gmd:organisationName>
      <gmd:positionName>
        <gco:CharacterString>template</gco:CharacterString>
      </gmd:positionName>
      <gmd:contactInfo>
        <gmd:CI_Contact>
          <gmd:phone>
            <gmd:CI_Telephone>
              <gmd:voice>
                <gco:CharacterString>template</gco:CharacterString>
              </gmd:voice>
              <gmd:facsimile>
                <gco:CharacterString>template</gco:CharacterString>
              </gmd:facsimile>
            </gmd:CI_Telephone>
          </gmd:phone>
          <gmd:address>
            <gmd:CI_Address>
              <gmd:deliveryPoint>
                <gco:CharacterString>template</gco:CharacterString>
              </gmd:deliveryPoint>
              <gmd:city>
                <gco:CharacterString>template</gco:CharacterString>
              </gmd:city>
              <gmd:administrativeArea>
                <gco:CharacterString>template</gco:CharacterString>
              </gmd:administrativeArea>
              <gmd:postalCode>
                <gco:CharacterString>template</gco:CharacterString>
              </gmd:postalCode>
              <gmd:country>
                <gco:CharacterString>template</gco:CharacterString>
              </gmd:country>
              <gmd:electronicMailAddress>
                <gco:CharacterString>template</gco:CharacterString>
              </gmd:electronicMailAddress>
            </gmd:CI_Address>
          </gmd:address>
          <gmd:hoursOfService>
            <gco:CharacterString>template</gco:CharacterString>
          </gmd:hoursOfService>
          <gmd:contactInstructions>
            <gco:CharacterString>template</gco:CharacterString>
          </gmd:contactInstructions>
        </gmd:CI_Contact>
      </gmd:contactInfo>
      <gmd:role>
        <gmd:CI_RoleCode codeList="http://www.ngdc.noaa.gov/metadata/published/xsd/schema/resources/Codelist/gmxCodelists.xml#CI_RoleCode" codeListValue="code">code</gmd:CI_RoleCode>
      </gmd:role>
    </gmd:CI_ResponsibleParty>
  </gmd:contact>
  <gmd:dateStamp>
    <gco:Date>2013-08-28</gco:Date>
  </gmd:dateStamp>
  <gmd:metadataStandardName>
    <gco:CharacterString>ISO 19115-2 Geographic Information - Metadata - Part 2: Extensions for Imagery and Gridded Data</gco:CharacterString>
  </gmd:metadataStandardName>
  <gmd:metadataStandardVersion>
    <gco:CharacterString>ISO 19115-2:2009(E)</gco:CharacterString>
  </gmd:metadataStandardVersion>
<!--insert spatial information if needed as example below details-->
<gmd:referenceSystemInfo>
<gmd:MD_ReferenceSystem uuid="895cc120-95ed-11e0-aa80-0800200c9a66">
    <gmd:referenceSystemIdentifier>
      <gmd:RS_Identifier>
        <gmd:authority>
          <gmd:CI_Citation>
            <gmd:title>
              <gco:CharacterString>WGS 84 / World Mercator</gco:CharacterString>
            </gmd:title>
            <gmd:date>
              <gmd:CI_Date>
                <gmd:date>
                  <gco:Date>2006-06-02</gco:Date>
                </gmd:date>
                <gmd:dateType>
                  <gmd:CI_DateTypeCode codeList="http://www.isotc211.org/2005/resources/Codelist/gmxCodelists.xml#CI_DateTypeCode" codeListValue="revision">revision</gmd:CI_DateTypeCode>
                </gmd:dateType>
              </gmd:CI_Date>
            </gmd:date>
            <gmd:citedResponsibleParty>
              <gmd:CI_ResponsibleParty>
                <gmd:contactInfo>
                  <gmd:CI_Contact>
                    <gmd:onlineResource>
                      <gmd:CI_OnlineResource>
                        <gmd:linkage>
                          <gmd:URL>
                            http://www.epsg-registry.org/export.htm?gml=urn:ogc:def:crs:EPSG::3395
                          </gmd:URL>
                        </gmd:linkage>
                      </gmd:CI_OnlineResource>
                    </gmd:onlineResource>
                  </gmd:CI_Contact>
                </gmd:contactInfo>
                <gmd:role>
                  <gmd:CI_RoleCode codeList="http://www.isotc211.org/2005/resources/Codelist/gmxCodelists.xml#CI_RoleCode" codeListValue="resourceProvider" codeSpace="001">resourceProvider</gmd:CI_RoleCode>
                </gmd:role>
              </gmd:CI_ResponsibleParty>
            </gmd:citedResponsibleParty>
          </gmd:CI_Citation>
        </gmd:authority>
        <gmd:code>
          <gco:CharacterString>urn:ogc:def:crs:EPSG::3395</gco:CharacterString>
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      </gmd:RS_Identifier>
    </gmd:referenceSystemIdentifier>
  </gmd:MD_ReferenceSystem>
</gmd:referenceSystemInfo>
  <gmd:identificationInfo>
    <gmd:MD_DataIdentification>
      <gmd:citation>
        <gmd:CI_Citation>
          <gmd:title>
            <gco:CharacterString>project_name</gco:CharacterString>
          </gmd:title>
          <gmd:date>
            <gmd:CI_Date>
              <gmd:date>
                <gco:Date>9999-01-01</gco:Date>
              </gmd:date>
              <gmd:dateType>
                <gmd:CI_DateTypeCode codeList="http://www.ngdc.noaa.gov/metadata/published/xsd/schema/resources/Codelist/gmxCodelists.xml#CI_DateTypeCode" codeListValue="creation">creation</gmd:CI_DateTypeCode>
              </gmd:dateType>
            </gmd:CI_Date>
          </gmd:date>
          <!-- last_data_update -->
          <gmd:date>
            <gmd:CI_Date>
              <gmd:date>
                <gco:Date>9999-01-01</gco:Date>
              </gmd:date>
              <gmd:dateType>
                <gmd:CI_DateTypeCode codeList="http://www.ngdc.noaa.gov/metadata/published/xsd/schema/resources/Codelist/gmxCodelists.xml#CI_DateTypeCode" codeListValue="revision">revision</gmd:CI_DateTypeCode>
              </gmd:dateType>
            </gmd:CI_Date>
          </gmd:date>
        </gmd:CI_Citation>
      </gmd:citation>
      <gmd:abstract>
        <gco:CharacterString>project_abstract</gco:CharacterString>
      </gmd:abstract>
      <gmd:purpose>
        <gco:CharacterString>project_purpose</gco:CharacterString>
      </gmd:purpose>
      <gmd:credit>
        <gco:CharacterString>data_acknowledgement</gco:CharacterString>
      </gmd:credit>
      <gmd:pointOfContact>
        <gmd:CI_ResponsibleParty>
          <gmd:individualName>
            <gco:CharacterString>principal_investigator</gco:CharacterString>
          </gmd:individualName>
          <gmd:organisationName>
            <gco:CharacterString>organization</gco:CharacterString>
          </gmd:organisationName>
          <gmd:positionName>
            <gco:CharacterString>principal_investigator_position</gco:CharacterString>
          </gmd:positionName>
          <gmd:contactInfo>
            <gmd:CI_Contact>
              <gmd:phone>
                <gmd:CI_Telephone>
                  <gmd:voice>
                    <gco:CharacterString>principal_investigator_phone</gco:CharacterString>
                  </gmd:voice>
                  <gmd:facsimile>
                    <gco:CharacterString>principal_investigator_fax</gco:CharacterString>
                  </gmd:facsimile>
                </gmd:CI_Telephone>
              </gmd:phone>
              <gmd:address>
                <gmd:CI_Address>
                  <gmd:city>
                    <gco:CharacterString>principal_investigator_city</gco:CharacterString>
                  </gmd:city>
                  <gmd:administrativeArea>
                    <gco:CharacterString>principal_investigator_state</gco:CharacterString>
                  </gmd:administrativeArea>
                  <gmd:postalCode>
                    <gco:CharacterString>principal_investigator_zip</gco:CharacterString>
                  </gmd:postalCode>
                  <gmd:country>
                    <gco:CharacterString>principal_investigator_country</gco:CharacterString>
                  </gmd:country>
                  <gmd:electronicMailAddress>
                    <gco:CharacterString>principal_investigator_address</gco:CharacterString>
                  </gmd:electronicMailAddress>
                </gmd:CI_Address>
              </gmd:address>
              <gmd:hoursOfService>
                <gco:CharacterString>template</gco:CharacterString>
              </gmd:hoursOfService>
              <gmd:contactInstructions>
                <gco:CharacterString>contact_instruction</gco:CharacterString>
              </gmd:contactInstructions>
            </gmd:CI_Contact>
          </gmd:contactInfo>
          <gmd:role>
            <gmd:CI_RoleCode codeList="http://www.ngdc.noaa.gov/metadata/published/xsd/schema/resources/Codelist/gmxCodelists.xml#CI_RoleCode" codeListValue="principalInvestigator">principalInvestigator</gmd:CI_RoleCode>
          </gmd:role>
        </gmd:CI_ResponsibleParty>
      </gmd:pointOfContact>
      <gmd:resourceMaintenance>
        <gmd:MD_MaintenanceInformation>
          <gmd:maintenanceAndUpdateFrequency>
            <!-- data_update_frequency will need to conform to the codelist values -->
            <gmd:MD_MaintenanceFrequencyCode codeList="http://www.ngdc.noaa.gov/metadata/published/xsd/schema/resources/Codelist/gmxCodelists.xml#MD_MaintenanceFrequencyCode" codeListValue="code">data_update_frequency</gmd:MD_MaintenanceFrequencyCode>
          </gmd:maintenanceAndUpdateFrequency>
          <gmd:dateOfNextUpdate>
            <gco:Date>9999-01-01</gco:Date>
          </gmd:dateOfNextUpdate>
          <gmd:maintenanceNote>
            <gco:CharacterString>data_update_note</gco:CharacterString>
          </gmd:maintenanceNote>
          <gmd:contact>
            <gmd:CI_ResponsibleParty>
              <gmd:individualName>
                <gco:CharacterString>data_center_contact_name</gco:CharacterString>
              </gmd:individualName>
              <gmd:organisationName>
                <gco:CharacterString>data_center</gco:CharacterString>
              </gmd:organisationName>
              <gmd:positionName>
                <gco:CharacterString>data_center_contact_position</gco:CharacterString>
              </gmd:positionName>
              <gmd:contactInfo>
                <gmd:CI_Contact>
                  <gmd:phone>
                    <gmd:CI_Telephone>
                      <gmd:voice>
                        <gco:CharacterString>data_center_phone</gco:CharacterString>
                      </gmd:voice>
                      <gmd:facsimile>
                        <gco:CharacterString>data_center_fax</gco:CharacterString>
                      </gmd:facsimile>
                    </gmd:CI_Telephone>
                  </gmd:phone>
                  <gmd:address>
                    <gmd:CI_Address>
                      <gmd:deliveryPoint>
                        <gco:CharacterString>template</gco:CharacterString>
                      </gmd:deliveryPoint>
                      <gmd:city>
                        <gco:CharacterString>data_center_city</gco:CharacterString>
                      </gmd:city>
                      <gmd:administrativeArea>
                        <gco:CharacterString>data_center_state</gco:CharacterString>
                      </gmd:administrativeArea>
                      <gmd:postalCode>
                        <gco:CharacterString>data_center_zip</gco:CharacterString>
                      </gmd:postalCode>
                      <gmd:country>
                        <gco:CharacterString>data_center_country</gco:CharacterString>
                      </gmd:country>
                      <gmd:electronicMailAddress>
                        <gco:CharacterString>data_center_address</gco:CharacterString>
                      </gmd:electronicMailAddress>
                    </gmd:CI_Address>
                  </gmd:address>
                  <gmd:onlineResource>
                    <gmd:CI_OnlineResource>
                      <gmd:linkage>
                        <gmd:URL>data_center_website</gmd:URL>
                      </gmd:linkage>
                    </gmd:CI_OnlineResource>
                  </gmd:onlineResource>
                  <gmd:hoursOfService>
                    <gco:CharacterString>data_center_hours</gco:CharacterString>
                  </gmd:hoursOfService>
                  <gmd:contactInstructions>
                    <gco:CharacterString>contact_instruction_data_center</gco:CharacterString>
                  </gmd:contactInstructions>
                </gmd:CI_Contact>
              </gmd:contactInfo>
              <gmd:role>
                <gmd:CI_RoleCode codeList="http://www.ngdc.noaa.gov/metadata/published/xsd/schema/resources/Codelist/gmxCodelists.xml#CI_RoleCode" codeListValue="code">code</gmd:CI_RoleCode>
              </gmd:role>
            </gmd:CI_ResponsibleParty>
          </gmd:contact>
        </gmd:MD_MaintenanceInformation>
      </gmd:resourceMaintenance>
      <gmd:resourceFormat>
        <gmd:MD_Format>
          <gmd:name>
            <gco:CharacterString>data_type</gco:CharacterString>
          </gmd:name>
          <gmd:version>
            <gco:CharacterString>data_file_version</gco:CharacterString>
          </gmd:version>
          <gmd:specification>
            <gco:CharacterString>data_file_name</gco:CharacterString>
          </gmd:specification>
          <gmd:fileDecompressionTechnique>
            <gco:CharacterString>compression_technique</gco:CharacterString>
          </gmd:fileDecompressionTechnique>
        </gmd:MD_Format>
      </gmd:resourceFormat>
      <!-- ARE THERE CONTROLLED VOCABULARIES TO REPRESENT THESE VALUES? -->
      <gmd:descriptiveKeywords>
        <gmd:MD_Keywords>
          <gmd:keyword>
            <gco:CharacterString>ambient_noise</gco:CharacterString>
          </gmd:keyword>
          <gmd:keyword>
            <gco:CharacterString>animal_sound</gco:CharacterString>
          </gmd:keyword>
          <gmd:keyword>
            <gco:CharacterString>anthropogenic_noise</gco:CharacterString>
          </gmd:keyword>
          <!--add type of keyword-->
          <gmd:type>
			  <gmd:MD_KeywordTypeCode codeList="http://www.isotc211.org/2005/resources/Codelist/gmxCodelists.xml#MD_KeywordTypeCode" codeListValue="theme" codeSpace="005">theme</gmd:MD_KeywordTypeCode>
		</gmd:type>
          <!--add name of thesaurus that these values come from...if none or user defined use citation as below-->
          <gmd:thesaurusName>
			  <gmd:CI_Citation>
				<gmd:title>
					<gco:CharacterString>None</gco:CharacterString>
				</gmd:title>
				<gmd:date gco:nilReason="unknown"/>
			 </gmd:CI_Citation>
		  </gmd:thesaurusName>
        </gmd:MD_Keywords>
      </gmd:descriptiveKeywords>
      <!-- HOW ARE THESE VALUES DETERMINED? -->
      <gmd:descriptiveKeywords>
        <gmd:MD_Keywords>
          <gmd:keyword>
            <!-- GET A LIST OF LOCATION KEYWORDS FROM GCMD -->
            <gco:CharacterString>Pacific_Ocean</gco:CharacterString>
          </gmd:keyword>
          <gmd:keyword>
            <gco:CharacterString>Atlantic_Ocean</gco:CharacterString>
          </gmd:keyword>
          <gmd:keyword>
            <gco:CharacterString>Arctic_Ocean</gco:CharacterString>
          </gmd:keyword>
          <gmd:keyword>
            <gco:CharacterString>Indian_Ocean</gco:CharacterString>
          </gmd:keyword>
          <gmd:type>
            <gmd:MD_KeywordTypeCode codeList="http://www.ngdc.noaa.gov/metadata/published/xsd/schema/resources/Codelist/gmxCodelists.xml#MD_KeywordTypeCode" codeListValue="place">place</gmd:MD_KeywordTypeCode>
          </gmd:type>
        </gmd:MD_Keywords>
      </gmd:descriptiveKeywords>
      <!-- WOULD IT BE ALL OF THESE VALUES OR SOME? -->
      <gmd:descriptiveKeywords>
        <gmd:MD_Keywords>
          <gmd:keyword>
            <gco:CharacterString>vessel</gco:CharacterString>
          </gmd:keyword>
          <gmd:keyword>
            <gco:CharacterString>glider</gco:CharacterString>
          </gmd:keyword>
          <gmd:keyword>
            <gco:CharacterString>drifting_buoy</gco:CharacterString>
          </gmd:keyword>
          <gmd:keyword>
            <gco:CharacterString>moored_buoy</gco:CharacterString>
          </gmd:keyword>
          <gmd:keyword>
            <gco:CharacterString>bottom_mounted</gco:CharacterString>
          </gmd:keyword>
          <gmd:type>
            <gmd:MD_KeywordTypeCode codeList="http://www.ngdc.noaa.gov/metadata/published/xsd/schema/resources/Codelist/gmxCodelists.xml#MD_KeywordTypeCode" codeListValue="platform">platform</gmd:MD_KeywordTypeCode>
          </gmd:type>
        </gmd:MD_Keywords>
      </gmd:descriptiveKeywords>
      <gmd:descriptiveKeywords>
        <gmd:MD_Keywords>
          <gmd:keyword>
            <gco:CharacterString>hydrophone_pressure_sensor</gco:CharacterString>
          </gmd:keyword>
          <gmd:keyword>
            <gco:CharacterString>hydrophone_vector_sensor</gco:CharacterString>
          </gmd:keyword>
          <gmd:keyword>
            <gco:CharacterString>preamplifier</gco:CharacterString>
          </gmd:keyword>
          <gmd:keyword>
            <gco:CharacterString>AD_converter</gco:CharacterString>
          </gmd:keyword>
          <gmd:keyword>
            <gco:CharacterString>recorder_analogue</gco:CharacterString>
          </gmd:keyword>
          <gmd:keyword>
            <gco:CharacterString>recorder_digital</gco:CharacterString>
          </gmd:keyword>
          <gmd:keyword>
            <gco:CharacterString>other_signal_conditioning</gco:CharacterString>
          </gmd:keyword>
          <gmd:type>
            <gmd:MD_KeywordTypeCode codeList="http://www.ngdc.noaa.gov/metadata/published/xsd/schema/resources/Codelist/gmxCodelists.xml#MD_KeywordTypeCode" codeListValue="instrument">instrument</gmd:MD_KeywordTypeCode>
          </gmd:type>

        </gmd:MD_Keywords>
      </gmd:descriptiveKeywords>

      <gmd:descriptiveKeywords>
        <gmd:MD_Keywords>
          <gmd:keyword>
            <gco:CharacterString>NOAA Northeast Fisheries Science Center</gco:CharacterString>
          </gmd:keyword>
          <gmd:keyword>
            <gco:CharacterString>NOAA Southeast Fisheries Science Center</gco:CharacterString>
          </gmd:keyword>
          <gmd:keyword>
            <gco:CharacterString>NOAA Northwest Fisheries Science Center</gco:CharacterString>
          </gmd:keyword>
          <gmd:keyword>
            <gco:CharacterString>NOAA Southwest Fisheries Science Center</gco:CharacterString>
          </gmd:keyword>
          <gmd:keyword>
            <gco:CharacterString>NOAA Alaska Fisheries Science Center</gco:CharacterString>
          </gmd:keyword>
          <gmd:keyword>
            <gco:CharacterString>NOAA Pacific Islands Fisheries Science Center</gco:CharacterString>
          </gmd:keyword>
          <gmd:type>
            <gmd:MD_KeywordTypeCode codeList="http://www.ngdc.noaa.gov/metadata/published/xsd/schema/resources/Codelist/gmxCodelists.xml#MD_KeywordTypeCode" codeListValue="dataCenter">dataCenter</gmd:MD_KeywordTypeCode>
          </gmd:type>
        </gmd:MD_Keywords>
      </gmd:descriptiveKeywords>
      <gmd:resourceConstraints>
        <gmd:MD_Constraints>
          <gmd:useLimitation>
            <gco:CharacterString>data_restriction</gco:CharacterString>
          </gmd:useLimitation>
        </gmd:MD_Constraints>
      </gmd:resourceConstraints>
      <gmd:language>
        <gco:CharacterString>eng; USA</gco:CharacterString>
      </gmd:language>      

      <gmd:topicCategory>
        <gmd:MD_TopicCategoryCode>oceans</gmd:MD_TopicCategoryCode>
      </gmd:topicCategory>

      <gmd:extent>
        <gmd:EX_Extent id="boundingExtent">
          <gmd:description>
            <gco:CharacterString>project_area_description</gco:CharacterString>
          </gmd:description>
          <gmd:geographicElement>
            <gmd:EX_GeographicBoundingBox>
              <gmd:westBoundLongitude>

                <gco:Decimal>-180</gco:Decimal>
              </gmd:westBoundLongitude>
              <gmd:eastBoundLongitude>

                <gco:Decimal>180</gco:Decimal>
              </gmd:eastBoundLongitude>
              <gmd:southBoundLatitude>

                <gco:Decimal>-90</gco:Decimal>
              </gmd:southBoundLatitude>
              <gmd:northBoundLatitude>

                <gco:Decimal>90</gco:Decimal>
              </gmd:northBoundLatitude>
            </gmd:EX_GeographicBoundingBox>
          </gmd:geographicElement>
          <gmd:temporalElement>
            <gmd:EX_TemporalExtent id="boundingTemporalExtent">
              <gmd:extent>
                <gml:TimePeriod gml:id="ID072">
                  <!--                 project_start_date-->
                  <gml:beginPosition>9999-01-01</gml:beginPosition>
                  <!--                  project_end_date-->
                  <gml:endPosition>9999-01-01</gml:endPosition>
                </gml:TimePeriod>
              </gmd:extent>
            </gmd:EX_TemporalExtent>
          </gmd:temporalElement>
          <gmd:verticalElement>
            <gmd:EX_VerticalExtent>
              <gmd:minimumValue>
                <!--                <gco:Real>minimum_sensor_depth</gco:Real>-->
                <gco:Real>99</gco:Real>
                <!--                <gco:Real>minimum_sensor_depth</gco:Real>-->
              </gmd:minimumValue>
              <gmd:maximumValue>
                <!--                <gco:Real>maximum_sensor_depth</gco:Real>-->
                <gco:Real>99</gco:Real>
                <!--                <gco:Real>maximum_sensor_depth</gco:Real>-->
              </gmd:maximumValue>
              <!-- WHAT ARE THE VERTICAL REFERENCES USUALLY USED? WILL THIS INFO BE AVAILABLE TO POPULATE THE METADATA RECORD? -->
              <gmd:verticalCRS>
                <gml:VerticalCRS gml:id="ID384">
                  <gml:description>template</gml:description>
                  <gml:identifier codeSpace="template">template</gml:identifier>
                  <gml:name>template</gml:name>
                  <gml:remarks>template</gml:remarks>
                  <gml:scope>template</gml:scope>
                  <gml:verticalCS>
                    <gml:VerticalCS gml:id="ID058">
                      <gml:description>template</gml:description>
                      <gml:identifier codeSpace="template">template</gml:identifier>
                      <gml:name>template</gml:name>
                      <gml:remarks>template</gml:remarks>
                      <gml:axis>
                        <gml:CoordinateSystemAxis uom="template" gml:id="ID060">
                          <gml:description>template</gml:description>
                          <gml:identifier codeSpace="template">template</gml:identifier>
                          <gml:name>template</gml:name>
                          <gml:remarks>template</gml:remarks>
                          <gml:axisAbbrev>template</gml:axisAbbrev>
                          <gml:axisDirection codeSpace="template">template</gml:axisDirection>
                          <gml:minimumValue>99</gml:minimumValue>
                          <gml:maximumValue>99</gml:maximumValue>
                          <gml:rangeMeaning codeSpace="template">template</gml:rangeMeaning>
                        </gml:CoordinateSystemAxis>
                      </gml:axis>
                    </gml:VerticalCS>
                  </gml:verticalCS>
                  <gml:verticalDatum>
                    <gml:VerticalDatum gml:id="ID062">
                      <gml:metaDataProperty>
                        <gml:GenericMetaData/>
                      </gml:metaDataProperty>
                      <!--<gml:description>template</gml:description>-->
                      <!--<gml:descriptionReference/>-->
                      <gml:identifier codeSpace="template">template</gml:identifier>
                      <!--<gml:name>template</gml:name>-->
                      <!--<gml:remarks>template</gml:remarks>-->
                      <gml:scope>template</gml:scope>
                    </gml:VerticalDatum>
                  </gml:verticalDatum>
                </gml:VerticalCRS>
              </gmd:verticalCRS>
            </gmd:EX_VerticalExtent>
          </gmd:verticalElement>
        </gmd:EX_Extent>
      </gmd:extent>
      <gmd:supplementalInformation>
        <gco:CharacterString>supplemental_info</gco:CharacterString>
      </gmd:supplementalInformation>
    </gmd:MD_DataIdentification>
  </gmd:identificationInfo>
  <gmi:acquisitionInformation>
    <gmi:MI_AcquisitionInformation>
      <!-- VESSEL -->
      <gmi:platform>
        <!--      vessel_name,acoustic_sampling_start_date-->
        <gmi:MI_Platform>
          <gmi:identifier>
            <gmd:MD_Identifier>
              <gmd:code>
                <gco:CharacterString>vessel_id</gco:CharacterString>
              </gmd:code>
            </gmd:MD_Identifier>
          </gmi:identifier>
          <gmi:description>
            <gco:CharacterString>platform_detail</gco:CharacterString>
          </gmi:description>
          <!-- HYDROPHONE -->
          <gmi:instrument>
            <!-- TO DO: PUT THIS INFO IN CONTENTINFO SECTION: hydrophone_maker_model,calibration_date,hydrophone_sensitivity,hydrophone_id,other_info -->
            <gmi:MI_Instrument>
              <gmi:identifier>
                <gmd:MD_Identifier>
                  <gmd:code>
                    <gco:CharacterString>hydrophone_id</gco:CharacterString>
                  </gmd:code>
                </gmd:MD_Identifier>
              </gmi:identifier>
              <gmi:type>
                <gco:CharacterString>hydrophone_type</gco:CharacterString>
              </gmi:type>
              <gmi:description>
                <gco:CharacterString>hydrophone_maker_model,calibration_date,hydrophone_sensitivity,hydrophone_id,other_info</gco:CharacterString>
              </gmi:description>
            </gmi:MI_Instrument>
          </gmi:instrument>
          <!-- PREAMPLIFIER -->
          <gmi:instrument>
            <gmi:MI_Instrument>
              <gmi:identifier>
                <gmd:MD_Identifier>
                  <gmd:code>
                    <gco:CharacterString>preamplifier_id</gco:CharacterString>
                  </gmd:code>
                </gmd:MD_Identifier>
              </gmi:identifier>
              <gmi:type>
                <gco:CharacterString>preamplifier_maker_model</gco:CharacterString>
              </gmi:type>
              <gmi:description>
                <gco:CharacterString>preamplifier_gain, other_info</gco:CharacterString>
              </gmi:description>
            </gmi:MI_Instrument>
          </gmi:instrument>
          <!-- CONVERTER -->
          <gmi:instrument>
            <!-- AD_converter_maker_model,sample_rate,AD_converter_id,other_info-->
            <gmi:MI_Instrument>
              <gmi:identifier>
                <gmd:MD_Identifier>
                  <gmd:code>
                    <gco:CharacterString>AD_converter_id</gco:CharacterString>
                  </gmd:code>
                </gmd:MD_Identifier>
              </gmi:identifier>
              <gmi:type>
                <gco:CharacterString>AD_converter_maker_model</gco:CharacterString>
              </gmi:type>
              <gmi:description>
                <gco:CharacterString>sample_rate,other_info </gco:CharacterString>
              </gmi:description>
            </gmi:MI_Instrument>
          </gmi:instrument>
          <!-- RECORDER -->
          <gmi:instrument>
            <!--recorder_maker_model-->
            <gmi:MI_Instrument>
              <gmi:identifier>
                <gmd:MD_Identifier>
                  <gmd:code>
                    <gco:CharacterString>recorder_id</gco:CharacterString>
                  </gmd:code>
                </gmd:MD_Identifier>
              </gmi:identifier>
              <gmi:type>
                <gco:CharacterString>recorder_type</gco:CharacterString>
              </gmi:type>
              <gmi:description>
                <gco:CharacterString>recorder_gain, other_info</gco:CharacterString>
              </gmi:description>
            </gmi:MI_Instrument>
          </gmi:instrument>
          <!-- DEVICE -->
          <gmi:instrument>
            <!-- 
              device_maker_model
              device_function              
              other_info
              additional_signal_con_type
            -->
            <gmi:MI_Instrument>
              <gmi:identifier>
                <gmd:MD_Identifier>
                  <gmd:code>
                    <gco:CharacterString>device_id</gco:CharacterString>
                  </gmd:code>
                </gmd:MD_Identifier>
              </gmi:identifier>
              <gmi:type/>
              <gmi:description>
                <gco:CharacterString>device_maker_model, device_function, other_info, additional_signal_con_type</gco:CharacterString>
              </gmi:description>
            </gmi:MI_Instrument>
          </gmi:instrument>

        </gmi:MI_Platform>
      </gmi:platform>
      <!-- GLIDER -->
      <gmi:platform>
        <!-- 
          glider_name,
          acoustic_sampling_start_date,
        -->
        <gmi:MI_Platform>
          <gmi:identifier>
            <gmd:MD_Identifier>
              <gmd:code>
                <gco:CharacterString>glider_id</gco:CharacterString>
              </gmd:code>
            </gmd:MD_Identifier>
          </gmi:identifier>
          <gmi:description>
            <gco:CharacterString>platform_detail</gco:CharacterString>
          </gmi:description>
          <!-- HYDROPHONE -->
          <gmi:instrument>
            <!-- TO DO: PUT THIS INFO IN CONTENTINFO SECTION: hydrophone_maker_model,calibration_date,hydrophone_sensitivity,hydrophone_id,other_info -->
            <gmi:MI_Instrument>
              <gmi:identifier>
                <gmd:MD_Identifier>
                  <gmd:code>
                    <gco:CharacterString>hydrophone_id</gco:CharacterString>
                  </gmd:code>
                </gmd:MD_Identifier>
              </gmi:identifier>
              <gmi:type>
                <gco:CharacterString>hydrophone_type</gco:CharacterString>
              </gmi:type>
              <gmi:description>
                <gco:CharacterString>hydrophone_maker_model,calibration_date,hydrophone_sensitivity,hydrophone_id,other_info</gco:CharacterString>
              </gmi:description>
            </gmi:MI_Instrument>
          </gmi:instrument>
          <!-- PREAMPLIFIER -->
          <gmi:instrument>
            <gmi:MI_Instrument>
              <gmi:identifier>
                <gmd:MD_Identifier>
                  <gmd:code>
                    <gco:CharacterString>preamplifier_id</gco:CharacterString>
                  </gmd:code>
                </gmd:MD_Identifier>
              </gmi:identifier>
              <gmi:type>
                <gco:CharacterString>preamplifier_maker_model</gco:CharacterString>
              </gmi:type>
              <gmi:description>
                <gco:CharacterString>preamplifier_gain, other_info</gco:CharacterString>
              </gmi:description>
            </gmi:MI_Instrument>
          </gmi:instrument>
          <!-- CONVERTER -->
          <gmi:instrument>
            <!-- AD_converter_maker_model,sample_rate,AD_converter_id,other_info-->
            <gmi:MI_Instrument>
              <gmi:identifier>
                <gmd:MD_Identifier>
                  <gmd:code>
                    <gco:CharacterString>AD_converter_id</gco:CharacterString>
                  </gmd:code>
                </gmd:MD_Identifier>
              </gmi:identifier>
              <gmi:type>
                <gco:CharacterString>AD_converter_maker_model</gco:CharacterString>
              </gmi:type>
              <gmi:description>
                <gco:CharacterString>sample_rate,other_info </gco:CharacterString>
              </gmi:description>
            </gmi:MI_Instrument>
          </gmi:instrument>
          <!-- RECORDER -->
          <gmi:instrument>
            <!--recorder_maker_model-->
            <gmi:MI_Instrument>
              <gmi:identifier>
                <gmd:MD_Identifier>
                  <gmd:code>
                    <gco:CharacterString>recorder_id</gco:CharacterString>
                  </gmd:code>
                </gmd:MD_Identifier>
              </gmi:identifier>
              <gmi:type>
                <gco:CharacterString>recorder_type</gco:CharacterString>
              </gmi:type>
              <gmi:description>
                <gco:CharacterString>recorder_gain, other_info</gco:CharacterString>
              </gmi:description>
            </gmi:MI_Instrument>
          </gmi:instrument>
          <!-- DEVICE -->
          <gmi:instrument>
            <!-- 
              device_maker_model
              device_function              
              other_info
              additional_signal_con_type
            -->
            <gmi:MI_Instrument>
              <gmi:identifier>
                <gmd:MD_Identifier>
                  <gmd:code>
                    <gco:CharacterString>device_id</gco:CharacterString>
                  </gmd:code>
                </gmd:MD_Identifier>
              </gmi:identifier>
              <gmi:type/>
              <gmi:description>
                <gco:CharacterString>device_maker_model, device_function, other_info, additional_signal_con_type</gco:CharacterString>
              </gmi:description>
            </gmi:MI_Instrument>
          </gmi:instrument>
        </gmi:MI_Platform>
      </gmi:platform>
      <!-- DRIFITING BUOY -->
      <gmi:platform>
        <!--drifting_buoy_name, 
        acoustic_sampling_start_date-->
        <gmi:MI_Platform>
          <gmi:identifier>
            <gmd:MD_Identifier>
              <gmd:code>
                <gco:CharacterString>drifting_buoy_id</gco:CharacterString>
              </gmd:code>
            </gmd:MD_Identifier>
          </gmi:identifier>
          <gmi:description>
            <gco:CharacterString>platform_detail</gco:CharacterString>
          </gmi:description>
          <!-- HYDROPHONE -->
          <gmi:instrument>
            <!-- TO DO: PUT THIS INFO IN CONTENTINFO SECTION: hydrophone_maker_model,calibration_date,hydrophone_sensitivity,hydrophone_id,other_info -->
            <gmi:MI_Instrument>
              <gmi:identifier>
                <gmd:MD_Identifier>
                  <gmd:code>
                    <gco:CharacterString>hydrophone_id</gco:CharacterString>
                  </gmd:code>
                </gmd:MD_Identifier>
              </gmi:identifier>
              <gmi:type>
                <gco:CharacterString>hydrophone_type</gco:CharacterString>
              </gmi:type>
              <gmi:description>
                <gco:CharacterString>hydrophone_maker_model,calibration_date,hydrophone_sensitivity,hydrophone_id,other_info</gco:CharacterString>
              </gmi:description>
            </gmi:MI_Instrument>
          </gmi:instrument>
          <!-- PREAMPLIFIER -->
          <gmi:instrument>
            <gmi:MI_Instrument>
              <gmi:identifier>
                <gmd:MD_Identifier>
                  <gmd:code>
                    <gco:CharacterString>preamplifier_id</gco:CharacterString>
                  </gmd:code>
                </gmd:MD_Identifier>
              </gmi:identifier>
              <gmi:type>
                <gco:CharacterString>preamplifier_maker_model</gco:CharacterString>
              </gmi:type>
              <gmi:description>
                <gco:CharacterString>preamplifier_gain, other_info</gco:CharacterString>
              </gmi:description>
            </gmi:MI_Instrument>
          </gmi:instrument>
          <!-- CONVERTER -->
          <gmi:instrument>
            <!-- AD_converter_maker_model,sample_rate,AD_converter_id,other_info-->
            <gmi:MI_Instrument>
              <gmi:identifier>
                <gmd:MD_Identifier>
                  <gmd:code>
                    <gco:CharacterString>AD_converter_id</gco:CharacterString>
                  </gmd:code>
                </gmd:MD_Identifier>
              </gmi:identifier>
              <gmi:type>
                <gco:CharacterString>AD_converter_maker_model</gco:CharacterString>
              </gmi:type>
              <gmi:description>
                <gco:CharacterString>sample_rate,other_info </gco:CharacterString>
              </gmi:description>
            </gmi:MI_Instrument>
          </gmi:instrument>
          <!-- RECORDER -->
          <gmi:instrument>
            <!--recorder_maker_model-->
            <gmi:MI_Instrument>
              <gmi:identifier>
                <gmd:MD_Identifier>
                  <gmd:code>
                    <gco:CharacterString>recorder_id</gco:CharacterString>
                  </gmd:code>
                </gmd:MD_Identifier>
              </gmi:identifier>
              <gmi:type>
                <gco:CharacterString>recorder_type</gco:CharacterString>
              </gmi:type>
              <gmi:description>
                <gco:CharacterString>recorder_gain, other_info</gco:CharacterString>
              </gmi:description>
            </gmi:MI_Instrument>
          </gmi:instrument>
          <!-- DEVICE -->
          <gmi:instrument>
            <!-- 
              device_maker_model
              device_function              
              other_info
              additional_signal_con_type
            -->
            <gmi:MI_Instrument>
              <gmi:identifier>
                <gmd:MD_Identifier>
                  <gmd:code>
                    <gco:CharacterString>device_id</gco:CharacterString>
                  </gmd:code>
                </gmd:MD_Identifier>
              </gmi:identifier>
              <gmi:type/>
              <gmi:description>
                <gco:CharacterString>device_maker_model, device_function, other_info, additional_signal_con_type</gco:CharacterString>
              </gmi:description>
            </gmi:MI_Instrument>
          </gmi:instrument>
        </gmi:MI_Platform>
      </gmi:platform>
      <gmi:platform>
        <!--moored_buoy_name
        acoustic_sampling_start_date-->
        <gmi:MI_Platform>
          <gmi:identifier>
            <gmd:MD_Identifier>
              <gmd:code>
                <gco:CharacterString>moored_buoy_id</gco:CharacterString>
              </gmd:code>
            </gmd:MD_Identifier>
          </gmi:identifier>
          <gmi:description>
            <gco:CharacterString>platform_detail</gco:CharacterString>
          </gmi:description>
          <!-- HYDROPHONE -->
          <gmi:instrument>
            <!-- TO DO: PUT THIS INFO IN CONTENTINFO SECTION: hydrophone_maker_model,calibration_date,hydrophone_sensitivity,hydrophone_id,other_info -->
            <gmi:MI_Instrument>
              <gmi:identifier>
                <gmd:MD_Identifier>
                  <gmd:code>
                    <gco:CharacterString>hydrophone_id</gco:CharacterString>
                  </gmd:code>
                </gmd:MD_Identifier>
              </gmi:identifier>
              <gmi:type>
                <gco:CharacterString>hydrophone_type</gco:CharacterString>
              </gmi:type>
              <gmi:description>
                <gco:CharacterString>hydrophone_maker_model,calibration_date,hydrophone_sensitivity,hydrophone_id,other_info</gco:CharacterString>
              </gmi:description>
            </gmi:MI_Instrument>
          </gmi:instrument>
          <!-- PREAMPLIFIER -->
          <gmi:instrument>
            <gmi:MI_Instrument>
              <gmi:identifier>
                <gmd:MD_Identifier>
                  <gmd:code>
                    <gco:CharacterString>preamplifier_id</gco:CharacterString>
                  </gmd:code>
                </gmd:MD_Identifier>
              </gmi:identifier>
              <gmi:type>
                <gco:CharacterString>preamplifier_maker_model</gco:CharacterString>
              </gmi:type>
              <gmi:description>
                <gco:CharacterString>preamplifier_gain, other_info</gco:CharacterString>
              </gmi:description>
            </gmi:MI_Instrument>
          </gmi:instrument>
          <!-- CONVERTER -->
          <gmi:instrument>
            <!-- AD_converter_maker_model,sample_rate,AD_converter_id,other_info-->
            <gmi:MI_Instrument>
              <gmi:identifier>
                <gmd:MD_Identifier>
                  <gmd:code>
                    <gco:CharacterString>AD_converter_id</gco:CharacterString>
                  </gmd:code>
                </gmd:MD_Identifier>
              </gmi:identifier>
              <gmi:type>
                <gco:CharacterString>AD_converter_maker_model</gco:CharacterString>
              </gmi:type>
              <gmi:description>
                <gco:CharacterString>sample_rate,other_info </gco:CharacterString>
              </gmi:description>
            </gmi:MI_Instrument>
          </gmi:instrument>
          <!-- RECORDER -->
          <gmi:instrument>
            <!--recorder_maker_model-->
            <gmi:MI_Instrument>
              <gmi:identifier>
                <gmd:MD_Identifier>
                  <gmd:code>
                    <gco:CharacterString>recorder_id</gco:CharacterString>
                  </gmd:code>
                </gmd:MD_Identifier>
              </gmi:identifier>
              <gmi:type>
                <gco:CharacterString>recorder_type</gco:CharacterString>
              </gmi:type>
              <gmi:description>
                <gco:CharacterString>recorder_gain, other_info</gco:CharacterString>
              </gmi:description>
            </gmi:MI_Instrument>
          </gmi:instrument>
          <!-- DEVICE -->
          <gmi:instrument>
            <!-- 
              device_maker_model
              device_function              
              other_info
              additional_signal_con_type
            -->
            <gmi:MI_Instrument>
              <gmi:identifier>
                <gmd:MD_Identifier>
                  <gmd:code>
                    <gco:CharacterString>device_id</gco:CharacterString>
                  </gmd:code>
                </gmd:MD_Identifier>
              </gmi:identifier>
              <gmi:type/>
              <gmi:description>
                <gco:CharacterString>device_maker_model, device_function, other_info, additional_signal_con_type</gco:CharacterString>
              </gmi:description>
            </gmi:MI_Instrument>
          </gmi:instrument>
        </gmi:MI_Platform>
      </gmi:platform>
      <gmi:platform>
        <!--suspended_platform_name,acoustic_sampling_start_date-->
        <gmi:MI_Platform>
          <gmi:identifier>
            <gmd:MD_Identifier>
              <gmd:code>
                <gco:CharacterString>suspended_platform_id</gco:CharacterString>
              </gmd:code>
            </gmd:MD_Identifier>
          </gmi:identifier>
          <gmi:description>
            <gco:CharacterString>platform_detail</gco:CharacterString>
          </gmi:description>
          <!-- HYDROPHONE -->
          <gmi:instrument>
            <!-- TO DO: PUT THIS INFO IN CONTENTINFO SECTION: hydrophone_maker_model,calibration_date,hydrophone_sensitivity,hydrophone_id,other_info -->
            <gmi:MI_Instrument>
              <gmi:identifier>
                <gmd:MD_Identifier>
                  <gmd:code>
                    <gco:CharacterString>hydrophone_id</gco:CharacterString>
                  </gmd:code>
                </gmd:MD_Identifier>
              </gmi:identifier>
              <gmi:type>
                <gco:CharacterString>hydrophone_type</gco:CharacterString>
              </gmi:type>
              <gmi:description>
                <gco:CharacterString>hydrophone_maker_model,calibration_date,hydrophone_sensitivity,hydrophone_id,other_info</gco:CharacterString>
              </gmi:description>
            </gmi:MI_Instrument>
          </gmi:instrument>
          <!-- PREAMPLIFIER -->
          <gmi:instrument>
            <gmi:MI_Instrument>
              <gmi:identifier>
                <gmd:MD_Identifier>
                  <gmd:code>
                    <gco:CharacterString>preamplifier_id</gco:CharacterString>
                  </gmd:code>
                </gmd:MD_Identifier>
              </gmi:identifier>
              <gmi:type>
                <gco:CharacterString>preamplifier_maker_model</gco:CharacterString>
              </gmi:type>
              <gmi:description>
                <gco:CharacterString>preamplifier_gain, other_info</gco:CharacterString>
              </gmi:description>
            </gmi:MI_Instrument>
          </gmi:instrument>
          <!-- CONVERTER -->
          <gmi:instrument>
            <!-- AD_converter_maker_model,sample_rate,AD_converter_id,other_info-->
            <gmi:MI_Instrument>
              <gmi:identifier>
                <gmd:MD_Identifier>
                  <gmd:code>
                    <gco:CharacterString>AD_converter_id</gco:CharacterString>
                  </gmd:code>
                </gmd:MD_Identifier>
              </gmi:identifier>
              <gmi:type>
                <gco:CharacterString>AD_converter_maker_model</gco:CharacterString>
              </gmi:type>
              <gmi:description>
                <gco:CharacterString>sample_rate,other_info </gco:CharacterString>
              </gmi:description>
            </gmi:MI_Instrument>
          </gmi:instrument>
          <!-- RECORDER -->
          <gmi:instrument>
            <!--recorder_maker_model-->
            <gmi:MI_Instrument>
              <gmi:identifier>
                <gmd:MD_Identifier>
                  <gmd:code>
                    <gco:CharacterString>recorder_id</gco:CharacterString>
                  </gmd:code>
                </gmd:MD_Identifier>
              </gmi:identifier>
              <gmi:type>
                <gco:CharacterString>recorder_type</gco:CharacterString>
              </gmi:type>
              <gmi:description>
                <gco:CharacterString>recorder_gain, other_info</gco:CharacterString>
              </gmi:description>
            </gmi:MI_Instrument>
          </gmi:instrument>
          <!-- DEVICE -->
          <gmi:instrument>
            <!-- 
              device_maker_model
              device_function              
              other_info
              additional_signal_con_type
            -->
            <gmi:MI_Instrument>
              <gmi:identifier>
                <gmd:MD_Identifier>
                  <gmd:code>
                    <gco:CharacterString>device_id</gco:CharacterString>
                  </gmd:code>
                </gmd:MD_Identifier>
              </gmi:identifier>
              <gmi:type/>
              <gmi:description>
                <gco:CharacterString>device_maker_model, device_function, other_info, additional_signal_con_type</gco:CharacterString>
              </gmi:description>
            </gmi:MI_Instrument>
          </gmi:instrument>
        </gmi:MI_Platform>
      </gmi:platform>
      <gmi:platform>
        <!--bottom_mounted_platform_name
        acoustic_sampling_start_date-->
        <gmi:MI_Platform>
          <gmi:identifier>
            <gmd:MD_Identifier>
              <gmd:code>
                <gco:CharacterString>bottom_mounted_platform_id</gco:CharacterString>
              </gmd:code>
            </gmd:MD_Identifier>
          </gmi:identifier>
          <gmi:description>
            <gco:CharacterString>platform_detail</gco:CharacterString>
          </gmi:description>
          <!-- HYDROPHONE -->
          <gmi:instrument>
            <!-- TO DO: PUT THIS INFO IN CONTENTINFO SECTION: hydrophone_maker_model,calibration_date,hydrophone_sensitivity,hydrophone_id,other_info -->
            <gmi:MI_Instrument>
              <gmi:identifier>
                <gmd:MD_Identifier>
                  <gmd:code>
                    <gco:CharacterString>hydrophone_id</gco:CharacterString>
                  </gmd:code>
                </gmd:MD_Identifier>
              </gmi:identifier>
              <gmi:type>
                <gco:CharacterString>hydrophone_type</gco:CharacterString>
              </gmi:type>
              <gmi:description>
                <gco:CharacterString>hydrophone_maker_model,calibration_date,hydrophone_sensitivity,hydrophone_id,other_info</gco:CharacterString>
              </gmi:description>
            </gmi:MI_Instrument>
          </gmi:instrument>
          <!-- PREAMPLIFIER -->
          <gmi:instrument>
            <gmi:MI_Instrument>
              <gmi:identifier>
                <gmd:MD_Identifier>
                  <gmd:code>
                    <gco:CharacterString>preamplifier_id</gco:CharacterString>
                  </gmd:code>
                </gmd:MD_Identifier>
              </gmi:identifier>
              <gmi:type>
                <gco:CharacterString>preamplifier_maker_model</gco:CharacterString>
              </gmi:type>
              <gmi:description>
                <gco:CharacterString>preamplifier_gain, other_info</gco:CharacterString>
              </gmi:description>
            </gmi:MI_Instrument>
          </gmi:instrument>
          <!-- CONVERTER -->
          <gmi:instrument>
            <!-- AD_converter_maker_model,sample_rate,AD_converter_id,other_info-->
            <gmi:MI_Instrument>
              <gmi:identifier>
                <gmd:MD_Identifier>
                  <gmd:code>
                    <gco:CharacterString>AD_converter_id</gco:CharacterString>
                  </gmd:code>
                </gmd:MD_Identifier>
              </gmi:identifier>
              <gmi:type>
                <gco:CharacterString>AD_converter_maker_model</gco:CharacterString>
              </gmi:type>
              <gmi:description>
                <gco:CharacterString>sample_rate,other_info </gco:CharacterString>
              </gmi:description>
            </gmi:MI_Instrument>
          </gmi:instrument>
          <!-- RECORDER -->
          <gmi:instrument>
            <!--recorder_maker_model-->
            <gmi:MI_Instrument>
              <gmi:identifier>
                <gmd:MD_Identifier>
                  <gmd:code>
                    <gco:CharacterString>recorder_id</gco:CharacterString>
                  </gmd:code>
                </gmd:MD_Identifier>
              </gmi:identifier>
              <gmi:type>
                <gco:CharacterString>recorder_type</gco:CharacterString>
              </gmi:type>
              <gmi:description>
                <gco:CharacterString>recorder_gain, other_info</gco:CharacterString>
              </gmi:description>
            </gmi:MI_Instrument>
          </gmi:instrument>
          <!-- DEVICE -->
          <gmi:instrument>
            <!-- 
              device_maker_model
              device_function              
              other_info
              additional_signal_con_type
            -->
            <gmi:MI_Instrument>
              <gmi:identifier>
                <gmd:MD_Identifier>
                  <gmd:code>
                    <gco:CharacterString>device_id</gco:CharacterString>
                  </gmd:code>
                </gmd:MD_Identifier>
              </gmi:identifier>
              <gmi:type/>
              <gmi:description>
                <gco:CharacterString>device_maker_model, device_function, other_info, additional_signal_con_type</gco:CharacterString>
              </gmi:description>
            </gmi:MI_Instrument>
          </gmi:instrument>
        </gmi:MI_Platform>
      </gmi:platform>
    </gmi:MI_AcquisitionInformation>
  </gmi:acquisitionInformation>
</gmi:MI_Metadata>

Reference Information

Contribution

Name Association
Shane Guan NOAA/National Marine Fisheries Service, Office of Protected Resources Silver Spring, MD, USA
Hassan Moustahfid NOAA, U.S. Integrated Ocean Observing System Program Office (corresponding author)
Anna Milan NOAA, National Geophysical Data Center, Boulder, CO, USA
Jacqueline Mize NOAA, National Coastal Data Development Center, Stennis, MS, USA

Validation

Name Association
Zdenka Willis Director of U.S. Integrated Ocean Observing System Program Office

Revisions

Date Version Notes
August 2014 1.0  

Acknowledgments

Special thanks go to Sofia VanParijs (NOAA, NEFSC), Jason Gedamke (NOAA, NMFS OS&T) for comments and suggestions that considerably improved this document content. We also appreciate the support from Jolie Harrison (NOAA, NMFS OPR), Zdenka Willis (US IOOS), Charlie Alexander (IOOS), and Dr. Christopher Fox (NGDC) for supporting this joint effort.

Endorsement Disclaimer

Mention of a commercial company or product does not constitute an endorsement by NOAA. Use of information from this publication for publicity or advertising purposes concerning proprietary products or the tests of such products is not authorized.

Citation

 

  1. “S” denotes the entry is a text value, while “N” denotes the entry is a numeric value.  2 3