[mapguide-users] MapGuide WMS Requests are Always in ESSG:4326 ?

[Jackie Ng]

Hi Crispin,

Could you attach or send me a .mgp of the WMS feature source and its
current configuration document so we have a baseline from which to
determine who/what is at fault and what can be done? I want to eliminate
the possibility that following your setup steps results in a
different feature source + config doc combination.

- Jackie

You wrote:

Hi,

I have a client with Map and MapGuide connecting to a WMS service for
UK maps. AutoCAD Map makes a request OK using similar FDO WMS provider
... but the MG logs showed a InvalidCRS message when MGServer makes a
map request.

I realised (via a public WMS and a helpful blog on using Fiddler) that
the issue is that MG is requests always using EPSG:4326 within the
Request=GetMap.

When I set my .MapDefinition up I used a British EPSG:27700 that is
listed as supported in the GetCapabilities but the request does not
use this native projection.
In the  case of the problem service it ONLY published on EPSG:27700
and a few others and NOT on the most common EPSG:4326 – and as such
returns an InvalidSRS response when MG sends it's converted request in
using 4326.

A solution, obvs, is to get the provider to add the CRS into the
GetCapabilities, however I think this is a bug (is there a workaround
with the configuration document?) as there is no obvious requirement
for this when working with projected maps and the projection is
published in the WMS.

Example:

  1.
Create a new WMS .FeatureSource to
https://map.bgs.ac.uk/arcgis/services/BGS_Detailed_Geology/MapServer/WMSServer?service=WMS&version=1.3.0


  1.
Create a new layer to "BGS 50k Bedrock" (a Maestro bug does not list
all layers, edit XML by hand)
  2.
Create a New Map, using EPSG:27700, add the layer
  3.
Create a New layout and set initial view to centre on 300000,600000
and zoom scale 40000
  4.
Map will preview OK but the underlying request shows similar to below
https://map.bgs.ac.uk/arcgis/services/BGS_Detailed_Geology/MapServer/WmsServer?version=1.3.0&service=WMS&REQUEST=GetMap&EXCEPTIONS=XML&LAYERS=BGS.50k.Bedrock&STYLES=&CRS=EPSG:4326&SRS=EPSG:4326&FORMAT=image/png&BBOX=56.211896,-3.973780,56.281919,-3.810279&HEIGHT=782&WIDTH=1032&TRANSPARENT=FALSE&BGCOLOR=0xFFFFFF



 Many thanks,

  Crispin

Crispin Hoult
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