On Mon, Aug 11, 2014 at 4:51 PM, Ben Khoo <[email protected]> wrote:
> Hi, > > I'd just like to check my understanding of > https://jira.codehaus.org/browse/GEOS-6420 (WMS GetFeatureInfo does > reproject the featureMember geometry in GeoServer 2.5) > > According to the issue and documentation > http://docs.geoserver.org/latest/en/user/services/wms/reference.html it > appears that the returned geometry should be reprojected into the specified > SRS no matter the projection of the layer in Geoserver. > Nope, neither the docs nor the ticket state that explicitly. The ticket was about a layer in EPSG:2157, with a request in EPSG:2157, with GetFeatureInfo apparenlty returning coordinates in lat/lon (I say apparently, because what they were actually getting were screen coordinates, in pixels). The documentation does not contain an example of reprojection either. If we go down to the OGC specification, they only say: ------------------------------ Because the WMS protocol is stateless, the GetFeatureInfo request indicates to the WMS what map the user is viewing by including most of the original GetMap request parameters (all but VERSION and REQUEST). From the spatial context information (BBOX, CRS, WIDTH, HEIGHT) in that GetMap request, along with the I,J position the user chose, the WMS can (possibly) return additional information about that position. *The actual semantics of how a WMS decides what to return more information about, or what exactly to return, are* *left up to the WMS provider.* ------------------------------ If you look at the GeoServer history, none of "vector" GetFeatureInfo output formats ever reprojected the geometries in the requested CRS, all of them always returned the geometries in the layer native SRS. Now, I'm not saying this behavior is correct, but it has been around for almost 10 years now, which means it cannot be changed lightly, as it would break existing clients. Now, given than most clients using GetFeatureInfo GML/JSON outputs are verticals (since a generic WMS client cannot be assuming any such output format), I believe what we could do is to add either a request parameter, or a admin level setting in the WMS panel (ideally both), to make the GetFeatureInfo reproject the results to the GetMap target projection (contributions/sponsorship to implement this are welcomed as usual :-p ) Cheers Andrea -- == GeoServer Professional Services from the experts! Visit http://goo.gl/NWWaa2 for more information. == Ing. Andrea Aime @geowolf Technical Lead GeoSolutions S.A.S. Via Poggio alle Viti 1187 55054 Massarosa (LU) Italy phone: +39 0584 962313 fax: +39 0584 1660272 mob: +39 339 8844549 http://www.geo-solutions.it http://twitter.com/geosolutions_it -------------------------------------------------------
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