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Recommendation

Each ICAO data set should be provided together with metadata giving the geographical extent of the data set.
This requirement can be fulfilled in one of three ways:

  • GeographicDescription; or
  • GeographicBoundingBox; or
  • BoundingPolygon.

Geographic Description

Requirement

Reference

DS-META-007



Element Name

Geographical extent of the data set



Obligation / Condition

Mandatory. One of the three options must be provided.



Multiplicity

1..*


ISO 19115 (2003)

Number

349



Name

geographicIdentifier



Definition

identifier used to represent a geographic area



XPath

gmd:MD_Metadata/gmd:identificationInfo/gmd:MD_DataIdentification/gmd:extent/gmd:EX_Extent/gmd:geographicElement/gmd:EX_GeographicDescription/gmd:MD_Identifier/gmd:code/gco:CharacterString



Data type

CharacterString



Domain

Free Text



Example

Belgium and Luxembourg


Implementing Instructions



-

Trace to ICAO



Not applicable

Example
<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>Belgium and Luxembourg</gco:CharacterString></gmd:code>
        </gmd:MD_Identifier>
       </gmd:geographicIdentifier>
      </gmd:EX_GeographicDescription>
     </gmd:geographicElement>
    </gmd:EX_Extent>
   </gmd:extent>
  </gmd:MD_DataIdentification>
 </gmd:identificationInfo>
...
</gmd:MD_Metadata>

Geographic Bounding Box

Requirement

Reference

DS-META-007



Element Name

Geographical extent of the data set



Obligation / Condition

Mandatory. One of the three options must be provided.



Multiplicity

1..*


ISO 19115

Number

344



Name

westBoundLongitude



Definition

Western-most coordinate of the limit of the dataset extent, expressed in longitude in decimal degrees (positive east)



XPath

gmd:MD_Metadata/gmd:identificationInfo/gmd:MD_DataIdentification/gmd:extent/gmd:EX_Extent/gmd:geographicElement/gmd:EX_GeographicBoundingBox/gmd:westBoundLongitude/gco:Decimal



Data type

Decimal



Domain

-180.00 <= West Bounding Longitude Value <= 180.00



Example

3.93


ISO 19115

Number

345



Name

eastBoundLongitude



Definition

Eastern-most coordinate of the limit of the dataset extent, expressed in longitude in decimal degrees (positive east)



XPath

gmd:MD_Metadata/gmd:identificationInfo/gmd:MD_DataIdentification/gmd:extent/gmd:EX_Extent/gmd:geographicElement/gmd:EX_GeographicBoundingBox/gmd:eastBoundLongitude/gco:Decimal



Data type

Decimal



Domain

-180.00 <= East Bounding Longitude Value <= 180.00



Example

7.57


ISO 19115

Number

346



Name

southBoundLatitude



Definition

Southern-most coordinate of the limit of the dataset extent, expressed in latitude in decimal degrees (positive north)



XPath

gmd:MD_Metadata/gmd:identificationInfo/gmd:MD_DataIdentification/gmd:extent/gmd:EX_Extent/gmd:geographicElement/gmd:EX_GeographicBoundingBox/gmd:southBoundLatitude/gco:Decimal



Data type

Decimal



Domain

-90.00 <= South Bounding Latitude Value <= North Bounding Latitude Value



Example

52.10


ISO 19115

Number

347



Name

northBoundLatitude



Definition

Northern-most coordinate of the limit of the dataset extent, expressed in latitude in decimal degrees (positive north)



XPath

gmd:MD_Metadata/gmd:identificationInfo/gmd:MD_DataIdentification/gmd:extent/gmd:EX_Extent/gmd:geographicElement/gmd:EX_GeographicBoundingBox/gmd:northBoundLatitude/gco:Decimal



Data type

Decimal



Domain

South Bounding Latitude Value <= North Bounding Latitude Value <= 90.00



Example

54.10


Implementing Instructions



-

Trace to ICAO



Not applicable

Example
<gmd:MD_Metadata>
...
 <gmd:identificationInfo>
  <gmd:MD_DataIdentification>
   <gmd:extent>
    <gmd:EX_Extent>
     <gmd:geographicElement>
      <gmd:EX_GeographicBoundingBox>
       <gmd:westBoundLongitude><gco:Decimal>3.93</gco:Decimal></gmd:westBoundLongitude>
       <gmd:eastBoundLongitude><gco:Decimal>7.57</gco:Decimal></gmd:eastBoundLongitude>
       <gmd:southBoundLatitude><gco:Decimal>52.10</gco:Decimal></gmd:southBoundLatitude>
       <gmd:northBoundLatitude><gco:Decimal>54.10</gco:Decimal></gmd:northBoundLatitude>
      </gmd:EX_GeographicBoundingBox>
     </gmd:geographicElement>
    </gmd:EX_Extent>
   </gmd:extent>
  </gmd:MD_DataIdentification>
 </gmd:identificationInfo>
...
</gmd:MD_Metadata>


BoundingPolygon

Requirement

Reference

DS-META-007


Element Name

Geographical extent of the data set


Obligation / Condition

Mandatory. One of the three options must be provided.


Multiplicity

1..*

ISO 19115 (2003)

Number

342


Name

polygon


Definition

set of points defining the bounding polygon


XPath

gmd:MetaData/gmd:identificationInfo/gmd:DataIdentification/gmd:extent/gmd:EX_Extent/gmd:geographicElement/gmd:EX_BoundingPolygon/gmd:polygon


Data type

Class


Domain

GM_Object


Example

30 30 30 40 60 40 60 30

Implementing Instructions


-

Trace to ICAO


Not applicable

Example
<gmd:MD_Metadata>
...
 <gmd:identificationInfo>
  <gmd:DataIdentification>
   <gmd:extent>
    <gmd:geographicElement>
     <gmd:EX_BoundingPolygon>
      <gmd:polygon> - various options exist for completing the polygon. Please refer to the ¿Guidance and Profile of GML for use with Aviation Data¿ [5].</gmd:polygon>
     </gmd:EX_BoundingPolygon>
    </gmd:geographicElement>
   </gmd:extent>
  </gmd:DataIdentification>
 <gmd:identificationInfo>
...
</gmd:MD_Metadata>



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