specification of CRS
Hello all,
I have just joined this group (it took some time to get through the subscription process). I hope the group will come to life soon, I think its subject is both interesting and important.
Here is one thing that I think would be good to share our thoughts on: the method of specification of the Coordinate Reference System (CRS), also known as the Spatial Reference System (SRS), in spatial Linked Data. I have been following and commenting on the GeoSPARQL specification, and this is one thing that I think I wish would have been different: In GeoSPARQL The CRS can be indicated by a URI (which is good), but that URI is concatenated with the coordinates in the literal that describes the geometry. I think it would have been much nicer if the CRS could be published as a separate triple. For one thing, it would allow consumers of data to use the CRS as a filter in SPARQL queries.
I wonder what the other group members think of this issue.
Greetings,
Frans
but that URI is concatenated with the coordinates in the literal that describes the geometry??!!!
That happens when the CRS is not CRS84, like the example on page 12 of the GeoSPARQL document. As you can see, the URI identifying the CRS is in the same text string as the WKT.
Unfortunately I can not reproduce that example here because URI are removed from my message when I post it.