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Tip
titleRule

Each ICAO obstacle data set shall be provided together with metadata giving the geographical extent of the data set

...

.

Info
titleRecommendation

Each ICAO data set, other than obstacle data sets, 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.

...

is fulfilled by including a geographic description (GeographicDescription) as a clear, textual description of the data set's geographical extent.


Tip
titleBest practice
The inclusion of a bounding box (GeographicBoundingBox) or a polygon (BoundingPolygon) is a good practice in the GIS world. They are useful for applications that represent the data graphically, to set the initial window size. They are also facilitate the evaluation of the geographical coverage of a data set without having to parse and decode the full data set.

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.

 

 

for obstacle data sets. Optional for other ICAO data sets. If provided:

  • GeographicDescription is mandatory.
  • Either GeographicBoundingBox or BoundingPolygon is recommended.

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:geographicIdentifier/gmd:MD_Identifier/gmd:code/gco:CharacterString

 

 

Data type

CharacterString

 

 

Domain

Free Text

 

 

Example

Belgium and Luxembourg

 

Implementing Instructions

 

 


-

 
Code Block

...

language

...

xml

...

 

...

Not applicable

...

 

titleExample
<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.
 
 
for obstacle data sets. Optional for other ICAO data sets. If provided:
  • GeographicDescription is mandatory.
  • Either GeographicBoundingBox or BoundingPolygon is recommended.
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
 
 

-
 
 Code Block
...
language
...
 
...
 
...
Not applicable
...
 
xml
titleExample
<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. 
for obstacle data sets. Optional for other ICAO data sets. If provided:
  • GeographicDescription is mandatory.
  • Either GeographicBoundingBox or BoundingPolygon is recommended.
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
 

-
-
 Code Block
...
language
...
xml
...
titleExample
...
<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"
...
.</gmd:polygon>
     </gmd:EX_BoundingPolygon>
    </gmd:geographicElement>
   </gmd:extent>
  </gmd:DataIdentification>
 <gmd:identificationInfo>
...
</gmd:MD_Metadata>
...