[mapserver-users] Using a CRS not indexed by the IOGP

[Passmore, James H.]

Hi Jukka

> I guess the WMS 1.3.0 standard, page 15:

> “Every Layer CRS has an identifier that is a character string. Two types of Layer CRS identifiers are permitted:
> “label” and “URL” identifiers:
> ⎯ Label: The identifier includes a namespace prefix, a colon, a numeric or string code, and in some instances a comma followed by additional parameters. This International Standard defines three namespaces: CRS, EPSG and AUTO2, as discussed below.
> ⎯ URL: The identifier is a fully-qualified URL that references a publicly-accessible file containing a definition of the CRS that is compliant with ISO 19111.

So I can see the reasoning behind MapServer reporting in a GetMap error message that it only supports CRS, EPSG and AUTO2, but the same WMS page also says "This international standard does not mandate support for any particular Layer CRS(s).  I take that to read that it should be possible to add support for other CRS outside of those CRS authorities, so ArcGIS WMS might support CRS from ESRI: namespace (CRS authority) for example.

The reason I say GetMap and not GetCapabilities is that it is possible to create a new authority, and reference it in a map file, such that the GetCapabilities response can report it supports a user defined CRS and work out the bounding box extents, it's just when you make a GetMap request, it doesn't work.   This is probably the makings of an enhancement request, but perhaps rather than saying MapServer should support any named CRS authority we could suggest to have a user: authority for all custom systems.  User: is used by QGIS for example.

James






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