Extent Documentation

From Federation of Earth Science Information Partners


I need to define the spatial, temporal, and vertical extents of resources associated with my metadata.


Overview

This basic extent information supports spatial/temporal searches that are increasingly important as the number of map based search interfaces increases. Many of the attributes included in this guidance spiral can be calculated from the data if the file is compliant with the NetCDF Climate and Forecast (CF) Metadata Convention. Describes a simple latitude, longitude, vertical and temporal bounding box. For a more detailed geospatial coverage, see the suggested geospatial attributes. Further refinement of the geospatial bounding box can be provided by using these units and resolution attributes. Many of these extent attributes are calculated using the CF-Conventions.

Implementation

Content Standard for Digital Geospatial Metadata (CSDGM)

Structure


Spatial and Vertical Extent <pre<noinclude> style="white-space: pre-wrap; white-space: -moz-pre-wrap; white-space: -pre-wrap; white-space: -o-pre-wrap; word-wrap: break-word;"><spref>

   <horizsys>
       <geograph>
           <latres>/metadata/spref/horizsys/geograph/latres</latres>
           <longres>/metadata/spref/horizsys/geograph/longres</longres>
           <geogunit>/metadata/spref/horizsys/geograph/geogunit</geogunit>
       </geograph>
       <geodetic>
           <horizdn>/metadata/spref/horizsys/geodetic/horizdn</horizdn>
           <ellips>/metadata/spref/horizsys/geodetic/ellips</ellips>
           <semiaxis>/metadata/spref/horizsys/geodetic/semiaxis</semiaxis>
           <denflat>/metadata/spref/horizsys/geodetic/denflat</denflat>
       </geodetic>
   </horizsys>
   <vertdef>
       <altsys>
           <altdatum>/metadata/spref/vertdef/altsys/altdatum</altdatum>
           <altres>/metadata/spref/vertdef/altsys/altres</altres>
           <altunits>/metadata/spref/vertdef/altsys/altunits</altunits>
           <altenc>/metadata/spref/vertdef/altsys/altenc</altenc>
       </altsys>
       <depthsys>
           <depthdn>/metadata/spref/vertdef/depthsys/depthdn</depthdn>
           <depthres>/metadata/spref/vertdef/depthsys/depthres</depthres>
           <depthdu>/metadata/spref/vertdef/depthsys/depthdu</depthdu>
           <depthem>/metadata/spref/vertdef/depthsys/depthem</depthem>
       </depthsys>
   </vertdef>

</spref>

Temporal Extent <pre<noinclude> style="white-space: pre-wrap; white-space: -moz-pre-wrap; white-space: -pre-wrap; white-space: -o-pre-wrap; word-wrap: break-word;"><timeperd>

   <timeinfo>
       <rngdates>
           <begdate>/metadata/idinfo/timeperd/timeinfo/rngdates/begdate</begdate>
           <begtime>/metadata/idinfo/timeperd/timeinfo/rngdates/begtime</begtime>
           <enddate>/metadata/idinfo/timeperd/timeinfo/rngdates/enddate</enddate>
           <endtime>/metadata/idinfo/timeperd/timeinfo/rngdates/endtime</endtime>
       </rngdates>
   </timeinfo>
   <current>/metadata/idinfo/timeperd/current</current>

</timeperd>

Place and Time Keywords <pre<noinclude> style="white-space: pre-wrap; white-space: -moz-pre-wrap; white-space: -pre-wrap; white-space: -o-pre-wrap; word-wrap: break-word;"> <keywords>

  <place>
    <placekt>/metadata/idinfo/keywords/place/placekt</placekt>
    <placekey>/metadata/idinfo/keywords/place/placekey</placekey>
  </place>

</keywords>

<pre<noinclude>> <keywords>

  <temporal>
    <tempkt>/metadata/idinfo/keywords/temporal/tempkt</tempkt>
    <tempkey>/metadata/idinfo/keywords/temporal/tempkey</tempkey>
  </temporal>

</keywords>

Bounding Box <pre<noinclude>> <spdom>

   <bounding>
       <westbc>metadata/idinfo/spdom/bounding/westbc</westbc>
       <eastbc>metadata/idinfo/spdom/bounding/eastbc</eastbc>
       <northbc>metadata/idinfo/spdom/bounding/northbc</northbc>
       <southbc>metadata/idinfo/spdom/bounding/southbc</southbc>
   </bounding>

</spdom>

Usage


UsageDescriptionXpath
Horizontal ExtentLocation information for the data collected./metadata/spref/horizsys
Vertical ExtentRange of heights the data was collected in./metadata/spref/vertdef
Temporal ExtentThe period of time the data in the resource was collected./metadata/idinfo/timeperd/timeinfo/rngdates
Place KeywordKeyword that gives the location of the resource./metadata/idinfo/keywords/place
Temporal KeywordKeyword identifies a time period related to the resource./metadata/idinfo/keywords/temporal
Bounding Boxset of four elements that define the outer edges of the area data collection took place/metadata/idinfo/spdom/bounding/westbc
and
/metadata/idinfo/spdom/bounding/eastbc
and
/metadata/idinfo/spdom/bounding/northbc
and
/metadata/idinfo/spdom/bounding/southbc

The CSDGM graphical interface is a useful resource in understanding the hierarchy of this metadata dialect

Directory Interchange Format (DIF)

Structure


Bounding Box and Vertical Extent <pre<noinclude> style="white-space: pre-wrap; white-space: -moz-pre-wrap; white-space: -pre-wrap; white-space: -o-pre-wrap; word-wrap: break-word;"><Spatial_Coverage>

   <Southernmost_Latitude>-90.0</Southernmost_Latitude>
   <Northernmost_Latitude>90.0</Northernmost_Latitude>
   <Westernmost_Longitude>-180.0</Westernmost_Longitude>
   <Easternmost_Longitude>180.0</Easternmost_Longitude>
   <Minimum_Altitude>0 KM</Minimum_Altitude>
   <Maximum_Altitude>33 KM</Maximum_Altitude>

</Spatial_Coverage>

Temporal Extent

<Temporal_Coverage>
    <Start_Date>/DIF/Temporal_Coverage/Start_Date</Start_Date>
    <Stop_Date>/DIF/Temporal_Coverage/Stop_Date</Stop_Date>
</Temporal_Coverage>

Paleo Temporal Extent

<Paleo_Temporal_Coverage>
    <Paleo_Start_Date>/DIF/Paleo_Temporal_Coverage/Paleo_Start_Date</Paleo_Start_Date>
    <Paleo_Stop_Date>/DIF/Paleo_Temporal_Coverage/Paleo_Stop_Date</Paleo_Stop_Date>
    <Chronostratigraphic_Unit uuid="uuid11">
        <Eon>/DIF/Paleo_Temporal_Coverage/Chronostratigraphic_Unit/Eon</Eon>
        <Era>/DIF/Paleo_Temporal_Coverage/Chronostratigraphic_Unit/Era</Era>
        <Period>/DIF/Paleo_Temporal_Coverage/Chronostratigraphic_Unit/Period</Period>
        <Epoch>/DIF/Paleo_Temporal_Coverage/Chronostratigraphic_Unit/Epoch</Epoch>
        <Stage>/DIF/Paleo_Temporal_Coverage/Chronostratigraphic_Unit/Stage</Stage>
        <Detailed_Classification>/DIF/Paleo_Temporal_Coverage/Chronostratigraphic_Unit/Detailed_Classification</Detailed_Classification>
    </Chronostratigraphic_Unit>
</Paleo_Temporal_Coverage>

Place Keywords <pre<noinclude> style="white-space: pre-wrap; white-space: -moz-pre-wrap; white-space: -pre-wrap; white-space: -o-pre-wrap; word-wrap: break-word;"> <Location>

   <Location_Category>/DIF/Location/Location_Category</Location_Category>
   <Location_Type>/DIF/Location/Location_Type</Location_Type>
   <Location_Subregion1>/DIF/Location/Location_Subregion1</Location_Subregion1>
   <Location_Subregion2>/DIF/Location/Location_Subregion2</Location_Subregion2>
   <Location_Subregion3>/DIF/Location/Location_Subregion3</Location_Subregion3>
   <Detailed_Location>/DIF/Location/Detailed_Location</Detailed_Location>

</Location>

Usage

UsageDescriptionXpath
Horizontal ExtentLocation information for the data collected./metadata/spref/horizsys
Vertical ExtentRange of heights the data was collected in./DIF/Spatial_Coverage/Minimum_Altitude
and
/DIF/Spatial_Coverage/Maximum_Altitude
Temporal ExtentThe period of time the data in the resource was collected./DIF/Temporal_Coverage
Place KeywordKeyword that gives the location of the resource./DIF/Location
Paleo TemporalIdentifies a time period related to the resource./DIF/Paleo_Temporal_Coverage

The DIF Writer's Guide is a valuable resource for documentation in this metadata dialect.

EOS Clearinghouse (ECHO)

Structure


Spatial <pre<noinclude> style="white-space: pre-wrap; white-space: -moz-pre-wrap; white-space: -pre-wrap; white-space: -o-pre-wrap; word-wrap: break-word;"><Spatial>

   <SpatialCoverageType>/*/Spatial/SpatialCoverageType</SpatialCoverageType>
   <HorizontalSpatialDomain>
       <ZoneIdentifier>/*/Spatial/HorizontalSpatialDomain/ZoneIdentifier</ZoneIdentifier>
       <Geometry>
           <CoordinateSystem>/*/Spatial/HorizontalSpatialDomain/Geometry/CoordinateSystem</CoordinateSystem>
           <Point>
               <PointLongitude>/*/Spatial/HorizontalSpatialDomain/Geometry/Point/PointLongitude</PointLongitude>
               <PointLatitude>/*/Spatial/HorizontalSpatialDomain/Geometry/Point/PointLatitude</PointLatitude>
           </Point>
           <BoundingRectangle>
               <WestBoundingCoordinate>/*/Spatial/HorizontalSpatialDomain/Geometry/BoundingRectangle/WestBoundingCoordinate</WestBoundingCoordinate>
               <NorthBoundingCoordinate>/*/Spatial/HorizontalSpatialDomain/Geometry/BoundingRectangle/NorthBoundingCoordinate</NorthBoundingCoordinate>
               <EastBoundingCoordinate>/*/Spatial/HorizontalSpatialDomain/Geometry/BoundingRectangle/EastBoundingCoordinate</EastBoundingCoordinate>
               <SouthBoundingCoordinate>/*/Spatial/HorizontalSpatialDomain/Geometry/BoundingRectangle/SouthBoundingCoordinate</SouthBoundingCoordinate>
               <CenterPoint>
                   <PointLongitude>/*/Spatial/HorizontalSpatialDomain/Geometry/BoundingRectangle/CenterPoint/PointLongitude</PointLongitude>
                   <PointLatitude>/*/Spatial/HorizontalSpatialDomain/Geometry/BoundingRectangle/CenterPoint/PointLatitude</PointLatitude>
               </CenterPoint>
           </BoundingRectangle>
           <GPolygon>
               <Boundary>
                   <Point>
                       <PointLongitude>/*/Spatial/HorizontalSpatialDomain/Geometry/GPolygon/Boundary/Point[1]/PointLongitude</PointLongitude>
                       <PointLatitude>/*/Spatial/HorizontalSpatialDomain/Geometry/GPolygon/Boundary/Point[1]/PointLatitude</PointLatitude>
                   </Point>
                   <Point>
                       <PointLongitude>/*/Spatial/HorizontalSpatialDomain/Geometry/GPolygon/Boundary/Point[2]/PointLongitude</PointLongitude>
                       <PointLatitude>/*/Spatial/HorizontalSpatialDomain/Geometry/GPolygon/Boundary/Point[2]/PointLatitude</PointLatitude>
                   </Point>
                   <Point>
                       <PointLongitude>/*/Spatial/HorizontalSpatialDomain/Geometry/GPolygon/Boundary/Point[3]/PointLongitude</PointLongitude>
                       <PointLatitude>/*/Spatial/HorizontalSpatialDomain/Geometry/GPolygon/Boundary/Point[3]/PointLatitude</PointLatitude>
                   </Point>
               </Boundary>
               <CenterPoint>
                   <PointLongitude>/*/Spatial/HorizontalSpatialDomain/Geometry/GPolygon/CenterPoint/PointLongitude</PointLongitude>
                   <PointLatitude>/*/Spatial/HorizontalSpatialDomain/Geometry/GPolygon/CenterPoint/PointLongitude</PointLatitude>
               </CenterPoint>
           </GPolygon>
           <Line>
               <Point>
                   <PointLongitude>40</PointLongitude>
                   <PointLatitude>50</PointLatitude>
               </Point>
               <Point>
                   <PointLongitude>60</PointLongitude>
                   <PointLatitude>70</PointLatitude>
               </Point>
           </Line>
       </Geometry>
   </HorizontalSpatialDomain>
   <VerticalSpatialDomain>
       <Type>/*/Spatial/VerticalSpatialDomain/Type</Type>
       <Value>/*/Spatial/VerticalSpatialDomain/Value</Value>
   </VerticalSpatialDomain>
   <VerticalSpatialDomain>
       <Type>/*/Spatial/VerticalSpatialDomain[2]/Type</Type>
       <Value>/*/Spatial/VerticalSpatialDomain[2]/Value</Value>
   </VerticalSpatialDomain>
   <VerticalSpatialDomain>
       <Type>Minimum Altitude</Type>
       <Value>22222</Value>
   </VerticalSpatialDomain>
   <VerticalSpatialDomain>
       <Type>Maximum Altitude</Type>
       <Value>33333</Value>
   </VerticalSpatialDomain>
   <OrbitParameters>
       <SwathWidth>/*/Spatial/OrbitParameters/SwathWidth</SwathWidth>
       <Period>/*/Spatial/OrbitParameters/Period</Period>
       <InclinationAngle>/*/Spatial/OrbitParameters/InclinationAngle</InclinationAngle>
       <NumberOfOrbits>/*/Spatial/OrbitParameters/NumberOfOrbits</NumberOfOrbits>
       <StartCircularLatitude>/*/Spatial/OrbitParameters/StartCircularLatitude</StartCircularLatitude>
   </OrbitParameters>
   <GranuleSpatialRepresentation>/*/Spatial/GranuleSpatialRepresentation</GranuleSpatialRepresentation>

</Spatial>

Temporal <pre<noinclude> style="white-space: pre-wrap; white-space: -moz-pre-wrap; white-space: -pre-wrap; white-space: -o-pre-wrap; word-wrap: break-word;"><Temporal>

   <TimeType>/*/Temporal/TimeType</TimeType>
   <DateType>/*/Temporal/DateType</DateType>
   <TemporalRangeType>/*/Temporal/TemporalRangeType</TemporalRangeType>
   <PrecisionOfSeconds>/*/Temporal/PrecisionOfSeconds</PrecisionOfSeconds>
   <EndsAtPresentFlag>/*/Temporal/EndsAtPresentFlag</EndsAtPresentFlag>
   <SingleDateTime>/*/Temporal/SingleDateTime</SingleDateTime>
   <RangeDateTime>
       <BeginningDateTime>/*/Temporal/RangeDateTime/BeginningDateTime</BeginningDateTime>
       <EndingDateTime>/*/Temporal/RangeDateTime/EndingDateTime</EndingDateTime>
   </RangeDateTime>

</Temporal>

Place Keywords <pre<noinclude> style="white-space: pre-wrap; white-space: -moz-pre-wrap; white-space: -pre-wrap; white-space: -o-pre-wrap; word-wrap: break-word;"><SpatialKeywords>

   <Keyword>/*/SpatialKeywords/Keyword</Keyword>

</SpatialKeywords>

Temporal Keywords

<TemporalKeywords>
    <Keyword>/*/TemporalKeywords/Keyword</Keyword>
</TemporalKeywords>

Usage

UsageDescriptionXpath
Horizontal ExtentLocation information for the data collected./metadata/spref/horizsys
Vertical ExtentRange of heights the data was collected in./metadata/spref/vertdef
Temporal ExtentThe period of time the data in the resource was collected./metadata/idinfo/timeperd/timeinfo/rngdates
Place KeywordKeyword that gives the location of the resource./metadata/idinfo/keywords/place
Temporal KeywordKeyword identifies a time period related to the resource./metadata/idinfo/keywords/temporal

The ECHO metadata standard as well as various user guides can be found here.

International Organization for Standardization 19115 (ISO19115)

Structure


Extents

<pre<noinclude> style="white-space: pre-wrap; white-space: -moz-pre-wrap; white-space: -pre-wrap; white-space: -o-pre-wrap; word-wrap: break-word;"> <gmd:extent>

   <gmd:EX_Extent id="boundingExtent">
       <gmd:geographicElement>
           <gmd:EX_GeographicBoundingBox id="boundingGeographicBoundingBox">
               <gmd:extentTypeCode>
                   <gco:Boolean>true</gco:Boolean>
               </gmd:extentTypeCode>
               <gmd:westBoundLongitude>\<!comment>
                   <gco:Decimal>-178</gco:Decimal>
               </gmd:westBoundLongitude>
               <gmd:eastBoundLongitude>
                   <gco:Decimal>180</gco:Decimal>                    
               </gmd:eastBoundLongitude>
               <gmd:southBoundLatitude>
                   <gco:Decimal>-78</gco:Decimal>
               </gmd:southBoundLatitude>
               <gmd:northBoundLatitude>
                   <gco:Decimal>75</gco:Decimal>
               </gmd:northBoundLatitude>
           </gmd:EX_GeographicBoundingBox>           
       </gmd:geographicElement>
       <gmd:geographicElement>
           <gmd:EX_GeographicDescription>
               <gmd:geographicIdentifier>
                   <gmd:MD_Identifier>
                       <gmd:authority>
                           <gmd:CI_Citation>
                               <gmd:title>
                                   <gco:CharacterString>NASA/GCMD Location Keywords</gco:CharacterString>
                               </gmd:title>
                               <gmd:date>
                                   <gmd:CI_Date>
                                       <gmd:date>
                                           <gco:Date>2009-01-01</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:CI_Citation>
                       </gmd:authority>
                       <gmd:code>
                           <gco:CharacterString>Location > Geographic Region > Global Ocean</gco:CharacterString>
                       </gmd:code>
                   </gmd:MD_Identifier>
               </gmd:geographicIdentifier>
           </gmd:EX_GeographicDescription>
       </gmd:geographicElement>
       <gmd:temporalElement>
           <gmd:EX_TemporalExtent id="boundingTemporalExtent">
               <gmd:extent>
                   <gml:TimePeriod gml:id="someTimeID">
                       <gml:beginPosition>1846</gml:beginPosition>
                       <gml:endPosition indeterminatePosition="now"/>
                   </gml:TimePeriod>                    
               </gmd:extent>
           </gmd:EX_TemporalExtent>
       </gmd:temporalElement>
       <gmd:verticalElement>
           <gmd:EX_VerticalExtent>
             <gmd:minimumValue>
               <gco:Real>10</gco:Real>
             </gmd:minimumValue>
             <gmd:maximumValue>
               <gco:Real>2810</gco:Real>
             </gmd:maximumValue>
             <gmd:verticalCRS gco:nilReason="unknown"/>
           </gmd:EX_VerticalExtent>
         </gmd:verticalElement>
       </gmd:EX_Extent>
   </gmd:EX_Extent>

</gmd:extent>

Usage

UsageDescriptionXpath
Dataset or Service ExtentThe EX_Extent object in MD_DataIdentification and SV_ServiceIdentification defines extents associated with a dataset or service./*/gmd:identificationInfo//gmd:extent/gmd:EX_Extent
Source Extent of Process StepThe EX_Extent object within LI_Source defines extents associated with data production sources. These sources are the inputs or outputs of data processing steps utilized to produce the data product./*/gmd:dataQualityInfo/gmd:DQ_DataQuality/gmd:lineage/gmd:LI_Lineage/gmd:source/gmd:LI_Source/gmd:sourceExtent/gmd:EX_Extent
Scope ExtentThe EX_Extent object within DQ_Scope defines extents associated with scope codes. Examples include collectionHardware, collectionSession, dataset, series, service, model, etc./*/gmd:dataQualityInfo/gmd:DQ_DataQuality/gmd:scope/gmd:DQ_Scope/gmd:extent/gmd:EX_Extent
Reference System ExtentThe EX_Extent object within RS_ReferenceSystem defines the valid range of values for the reference system./*/gmd:referenceSystemInfo/gmd:RS_ReferenceSystem/gmd:domainOfValidity/gmd:EX_Extent

The ISO EX_Extent object is used to describe the spatial, temporal and vertical extent of resources, responsibilities, processing, quality reports, or maintenance.

The EX_Extent object supports multiple geographic and temporal extents within a single object.  This capability is quite useful for describing datasets created from observations collected at different locations and times.  For example, a dataset that includes observations collected at different locations each field season.

Bounding Extent. The ISO metadata standards allow multiple extents to be associated with a resource. This capability can be very important as spatial and temporal observatory deployments become more complex. Many metadata tools require a single bounding extent in order to support simple spatial and temporal discovery. In order to easily and unambiguously identify the bounding extent for a resource, we recommend identifying it with an xml id = 'boundingExtent'.

Two-Dimensional Tiling Systems. Several NASA metadata standards include the capability to describe spatial extents of resources using two-dimensional tiling systems. The tile numbers in these systems are standard geographic identifiers that can be used to improve performance of spatial searches. MENDS recommended syntax for these tile identifiers in ISO.

ISO 19115 combines spatial and temporal extents into a single object, called an EX_Extent, that includes temporal, vertical, and geographic extents. The temporal and vertical extents are simple descriptions of temporal or vertical ranges. The geographic extent can be described in three ways.

The first option is a simple bounding box for recording the north, south, east and west bounding coordinates.

The second option generalizes the bounding box to a bounding polygon. This covers a large number of cases which might involve natural shapes, such as watersheds, or political shapes, like county forecast zones, rather than rectangles.

The final option allows specification of an identifier of a geographic region. This identifier includes a namespace and a name, and allows the use of named spatial objects, like counties, to describe spatial extents.


 

Crosswalks

Rubric Spatial and Temporal Search

This basic extent information supports spatial/temporal searches that are increasingly important as the number of map based search interfaces increases. Many of the attributes included in this spiral can be calculated from the data if the file is compliant with the NetCDF Climate and Forecast (CF) Metadata Convention. Describes a simple latitude, longitude, vertical and temporal bounding box. For a more detailed geospatial coverage, see the suggested geospatial attributes. Further refinement of the geospatial bounding box can be provided by using these units and resolution attributes. Many of these extent attributes are calculated using the CF-Conventions.
ConceptDescriptionDialect (Fit) Paths
Bounding BoxA bounding box for identifying a geographic area of interest

Note: This concept is called "Coverage" in the CSW Specification
CSDGM /metadata/idinfo/spdom/bounding
DIF /DIF/Spatial_Coverage
ECHO /*/echo:Spatial/echo:HorizontalSpatialDomain/echo:Geometry/echo:BoundingRectangle
ISO /*/gmd:identificationInfo/gmd:MD_DataIdentification/gmd:extent/gmd:EX_Extent/gmd:geographicElement/gmd:EX_GeographicBoundingBox
ISO /*/gmd:identificationInfo/srv:SV_ServiceIdentification/srv:extent/gmd:EX_Extent/gmd:geographicElement/gmd:EX_GeographicBoundingBox
Southernmost LatitudeThe southernmost latitude of the bounding rectangle.

Note: OGC-SOS offering lists may not include the entire dataset. A gml:id attribute can be used to identify the bounding offering.
CSDGM /metadata/idinfo/spdom/bounding/southbc
DIF (1) /DIF/Spatial_Coverage/Southernmost_Latitude
ECHO (1) /*/echo:Spatial/echo:HorizontalSpatialDomain/echo:Geometry/echo:BoundingRectangle/echo:SouthBoundingCoordinate
ISO (1) /*/gmd:identificationInfo/*/gmd:extent/gmd:EX_Extent/gmd:geographicElement/gmd:EX_GeographicBoundingBox/gmd:southBoundLatitude/gco:Decimal
Northernmost LatitudeThe northernmost latitude of the bounding rectangle.

Note: OGC-SOS offering lists may not include the entire dataset. A gml:id attribute (e.g. gml:id="network-all") can be used to identify the bounding offering.
CSDGM /metadata/idinfo/spdom/bounding/northbc
DIF (1) /DIF/Spatial_Coverage/Northernmost_Latitude
ECHO (1) /*/echo:Spatial/echo:HorizontalSpatialDomain/echo:Geometry/echo:BoundingRectangle/echo:NorthBoundingCoordinate
ISO (1) /*/gmd:identificationInfo/*/gmd:extent/gmd:EX_Extent/gmd:geographicElement/gmd:EX_GeographicBoundingBox/gmd:northBoundLatitude/gco:Decimal
Westernmost LongitudeThe westernmost longitude of the bounding rectangle.

Note: OGC-SOS offering lists may not include the entire dataset. A gml:id attribute can be used to identify the bounding offering.
CSDGM /metadata/idinfo/spdom/bounding/westbc
DIF (1) /DIF/Spatial_Coverage/Westernmost_Longitude
ECHO (1) /*/echo:Spatial/echo:HorizontalSpatialDomain/echo:Geometry/echo:BoundingRectangle/echo:WestBoundingCoordinate
ISO (1) /*/gmd:identificationInfo/*/gmd:extent/gmd:EX_Extent/gmd:geographicElement/gmd:EX_GeographicBoundingBox/gmd:westBoundLongitude/gco:Decimal
Easternmost LongitudeThe easternmost longitude of the bounding rectangle.

Note: OGC-SOS offering lists may not include the entire dataset. A gml:id attribute can be used to identify the bounding offering.
CSDGM /metadata/idinfo/spdom/bounding/eastbc
DIF (1) /DIF/Spatial_Coverage/Easternmost_Longitude
ECHO (1) /*/echo:Spatial/echo:HorizontalSpatialDomain/echo:Geometry/echo:BoundingRectangle/echo:WestBoundingCoordinate
ISO (1) /*/gmd:identificationInfo/*/gmd:extent/gmd:EX_Extent/gmd:geographicElement/gmd:EX_GeographicBoundingBox/gmd:eastBoundLongitude/gco:Decimal
Temporal ExtentThe temporal extent of the resourceCSDGM /metadata/idinfo/timeperd/timeinfo/rngdates
DIF /TemporalCoverage
ECHO /*/Temporal/RangeDateTime
ISO /*/gmd:MD_DataIdentification/gmd:extent/gmd:EX_Extent/gmd:temporalElement/gmd:EX_TemporalExtent
Start TimeThe start of the bounding time periodDIF /DIF/Temporal_Coverage/Start_Date
ECHO /*/echo:Temporal/echo:RangeDateTime/echo:BeginningDateTime
ISO /*/gmd:identificationInfo/*/gmd:extent/gmd:EX_Extent/gmd:temporalElement/gmd:EX_TemporalExtent/gmd:extent/gml:TimePeriod/gml:beginPosition
End TimeThe end of the bounding time periodDIF /DIF/Temporal_Coverage/Stop_Date
ECHO /*/echo:Temporal/echo:RangeDateTime/echo:EndingDateTime
ECHO /*/echo:Temporal/echo:EndsAtPresentFlag
ISO /*/gmd:identificationInfo/*/gmd:extent/gmd:EX_Extent/gmd:temporalElement/gmd:EX_TemporalExtent/gmd:extent/gml:TimePeriod/gml:endPosition
Vertical ExtentThe vertical extent of the resourceDIF /SpatialCoverage
ISO /*/gmd:MD_DataIdentification/gmd:extent/gmd:EX_Extent/gmd:verticalElement/gmd:EX_VerticalExtent
Vertical MinimumThe minimum height of the bounding rectangleDIF /DIF/Spatial_Coverage/Minimum_Altitude
DIF /DIF/Spatial_Coverage/Minimum_Depth
ISO /*/gmd:identificationInfo/*/gmd:extent/gmd:EX_Extent/gmd:verticalElement/gmd:EX_VerticalExtent/gmd:minimumValue/gco:Real
Vertical MaximumThe maximum height of the bounding rectangleDIF /DIF/Spatial_Coverage/Maximum_Altitude
DIF /DIF/Spatial_Coverage/Maximum_Depth
ISO /*/gmd:identificationInfo/*/gmd:extent/gmd:EX_Extent/gmd:verticalElement/gmd:EX_VerticalExtent/gmd:maximumValue/gco:Real
Place KeywordA comma separated list of key words and phrases that give the location of the resource.

Note: Some dialects include keywords, but they do not include mechanisms for identifying the type. In those cases it is difficult to unambiguously identify place keywords.
CSDGM /metadata/idinfo/keywords/place/placekey
DIF /DIF/Location/Location_Category
DIF /DIF/Location/Location_Type
DIF /DIF/Location/Location_Subregion1
DIF /DIF/Location/Location_Subregion2
DIF /DIF/Location/Location_Subregion3
DIF /DIF/Location/Detailed_Location
ISO /*/gmd:identificationInfo/*/gmd:descriptiveKeywords/gmd:MD_Keywords[normalize-space(gmd:type/gmd:MD_KeywordTypeCode)='place']/gmd:keyword/gco:CharacterString
ISO /gmd:MD_Metadata/gmd:identificationInfo/gmd:MD_DataIdentification/gmd:extent/gmd:EX_Extent/gmd:geographicElement/gmd:EX_GeographicDescription/gmd:geographicIdentifier/gmd:MD_Identifier/gmd:code/gco:CharacterString
Place Keyword VocabularyIf you are following a guideline for the place words/phrases in your "keywords" attribute, put the name of that guideline here.CSDGM /metadata/idinfo/keywords/place/placekt
ISO /*/gmd:identificationInfo/*/gmd:descriptiveKeywords/gmd:MD_Keywords[normalize-space(gmd:type/gmd:MD_KeywordTypeCode)='place']/gmd:thesaurusName/gmd:CI_Citation/gmd:title/gco:CharacterString

Notes

This table reflects the MENDS voting recommendations pertaining to the mapping of ECHO bounding coordinates to ISO.

ECHO AttributeISO Equivalent
/*/Spatial/HorizontalSpatialDomain/Geometry/BoundingRectangle/CenterPoint/PointLatitude/gmi:MI_Metadata/gmd:identificationInfo/gmd:MD_DataIdentification/gmd:extent/gmd:EX_Extent/gmd:geographicElement/gmd:EX_BoundingPolygon/gmd:polygon/gml:LineString/gml:posList
/*/Spatial/HorizontalSpatialDomain/Geometry/BoundingRectangle/CenterPoint/PointLongitude/gmi:MI_Metadata/gmd:identificationInfo/gmd:MD_DataIdentification/gmd:extent/gmd:EX_Extent/gmd:geographicElement/gmd:EX_BoundingPolygon/gmd:polygon/gml:LineString/gml:posList
/*/Spatial/HorizontalSpatialDomain/Geometry/BoundingRectangle/EastBoundingCoordinate/gmi:MI_Metadata/gmd:identificationInfo/gmd:MD_DataIdentification/gmd:extent/gmd:EX_Extent/gmd:geographicElement/gmd:EX_GeographicBoundingBox/gmd:eastBoundLongitude/gco:Decimal
/*/Spatial/HorizontalSpatialDomain/Geometry/BoundingRectangle/NorthBoundingCoordinate/gmi:MI_Metadata/gmd:identificationInfo/gmd:MD_DataIdentification/gmd:extent/gmd:EX_Extent/gmd:geographicElement/gmd:EX_GeographicBoundingBox/gmd:northBoundLatitude/gco:Decimal
/*/Spatial/HorizontalSpatialDomain/Geometry/BoundingRectangle/SouthBoundingCoordinate/gmi:MI_Metadata/gmd:identificationInfo/gmd:MD_DataIdentification/gmd:extent/gmd:EX_Extent/gmd:geographicElement/gmd:EX_GeographicBoundingBox/gmd:southBoundLatitude/gco:Decimal
/*/Spatial/HorizontalSpatialDomain/Geometry/BoundingRectangle/WestBoundingCoordinate/gmi:MI_Metadata/gmd:identificationInfo/gmd:MD_DataIdentification/gmd:extent/gmd:EX_Extent/gmd:geographicElement/gmd:EX_GeographicBoundingBox/gmd:westBoundLongitude/gco:Decimal
/*/Spatial/HorizontalSpatialDomain/Geometry/GPolygon/Boundary/Point/PointLatitude/gmi:MI_Metadata/gmd:identificationInfo/gmd:MD_DataIdentification/gmd:extent/gmd:EX_Extent/gmd:geographicElement/gmd:EX_BoundingPolygon/gmd:polygon/gml:LineString/gml:posList
/*/Spatial/HorizontalSpatialDomain/Geometry/GPolygon/Boundary/Point/PointLongitude/gmi:MI_Metadata/gmd:identificationInfo/gmd:MD_DataIdentification/gmd:extent/gmd:EX_Extent/gmd:geographicElement/gmd:EX_BoundingPolygon/gmd:polygon/gml:LineString/gml:posList
/*/Spatial/HorizontalSpatialDomain/Geometry/GPolygon/CenterPoint/PointLatitude/gmi:MI_Metadata/gmd:identificationInfo/gmd:MD_DataIdentification/gmd:extent/gmd:EX_Extent/gmd:geographicElement/gmd:EX_BoundingPolygon/gmd:polygon/gml:LineString/gml:posList
/*/Spatial/HorizontalSpatialDomain/Geometry/GPolygon/CenterPoint/PointLongitude/gmi:MI_Metadata/gmd:identificationInfo/gmd:MD_DataIdentification/gmd:extent/gmd:EX_Extent/gmd:geographicElement/gmd:EX_BoundingPolygon/gmd:polygon/gml:LineString/gml:posList
/*/Spatial/HorizontalSpatialDomain/Geometry/Line/Point/PointLatitude/gmi:MI_Metadata/gmd:identificationInfo/gmd:MD_DataIdentification/gmd:extent/gmd:EX_Extent/gmd:geographicElement/gmd:EX_GeographicBoundingBox/gmd:northBoundLatitude/gco:Decimal
/*/Spatial/HorizontalSpatialDomain/Geometry/Line/Point/PointLongitude/gmi:MI_Metadata/gmd:identificationInfo/gmd:MD_DataIdentification/gmd:extent/gmd:EX_Extent/gmd:geographicElement/gmd:EX_GeographicBoundingBox/gmd:westBoundLongitude/gco:Decimal
/*/Spatial/HorizontalSpatialDomain/Geometry/Point/PointLatitude/gmi:MI_Metadata/gmd:identificationInfo/gmd:MD_DataIdentification/gmd:extent/gmd:EX_Extent/gmd:geographicElement/gmd:EX_GeographicBoundingBox/gmd:northBoundLatitude/gco:Decimal
/*/Spatial/HorizontalSpatialDomain/Geometry/Point/PointLatitude/gmi:MI_Metadata/gmd:identificationInfo/gmd:MD_DataIdentification/gmd:extent/gmd:EX_Extent/gmd:geographicElement/gmd:EX_GeographicBoundingBox/gmd:southBoundLatitude/gco:Decimal
/*/Spatial/HorizontalSpatialDomain/Geometry/Point/PointLongitude/gmi:MI_Metadata/gmd:identificationInfo/gmd:MD_DataIdentification/gmd:extent/gmd:EX_Extent/gmd:geographicElement/gmd:EX_GeographicBoundingBox/gmd:eastBoundLongitude/gco:Decimal
/*/Spatial/HorizontalSpatialDomain/Geometry/Point/PointLongitude/gmi:MI_Metadata/gmd:identificationInfo/gmd:MD_DataIdentification/gmd:extent/gmd:EX_Extent/gmd:geographicElement/gmd:EX_GeographicBoundingBox/gmd:westBoundLongitude/gco:Decima