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GeoDCAT-AP [PR]: Coordinate Reference System - Separate into horizontal and vertical CRS values

Anonymous (not verified)
Published on: 26/08/2015 Discussion Archived

References

This issue has been reported by Trevor Alcorn.

http://joinup.ec.europa.eu/mailman/archives/dcat_application_profile-geo/2015-August/000187.html

 

Explanation

The proposal is to separate the coordinate reference system into 'horizontal' and 'vertical' CRS values where implemented in ISO 19139 INSPIRE values.

  • Horizontal
    • ​EPSG::4326
    • EPSG::4258
  • Vertical - 128 Global Vertical Datum (3 examples provided below)
    • EPSG::5715 (MSL depth)
    • EPSG::5714 (MSL height)
    • EPSG::5100 (Mean Sea Level)
Draft 6 of the GeoDCAT-AP specification proposes to specify the coordinate reference system by using the corresponding URIs from the “EPSG coordinate reference systems” register, which is documented by a code.

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Documentation

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Comments

Andrea PEREGO
Andrea PEREGO Tue, 08/12/2015 - 15:25

See reply in: http://joinup.ec.europa.eu/mailman/archives/dcat_application_profile-geo/2015-September/000209.html

 

Quoting:

This is very much related to an open issue in GeoDCAT-AP, concerning how to model the specification of the reference systems used.
The current proposal, that might be revised in the final version of GeoDCAT-AP, is to use dct:conformsTo as a provisional solution, with the intention to replace it with mode appropriate predicates, when available in de jure / de facto standards. BTW, this is one of the issues discussed in the framework of the joint W3C/OGC Spatial Data on the Web (SDW) WG.
stijngoedertier (not verified) Tue, 22/12/2015 - 08:45

The separation into horizontal and vertical coordinate reference systems (CRS) is something to be handled at the level of the controlled vocabulary, i.e. the EPSG coordinate system register. 

 

A vertical and horizontal CRS can be combined to create a customised compound coordinate reference system (The horizontal CRS contains two dimensions, such as X and Y or longitude and latitude, and the vertical CRS contains the third dimension, such as Z or height or mean sea level height.). The EPSG register seems to contain such compound CRSs (e.g. EPSG::7404).

 

For the encoding of coordinate reference system, see also issue: https://joinup.ec.europa.eu/node/144711 .

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