topic Re: WMS-layer problem in .NET Maps SDK Questions

WMS-layer problem

TuukkaJärvinen — Sat, 11 Dec 2021 20:10:57 GMT

Hi,

I would like to show a layer from a WMS-service on my map but somehow it draws nothing. The WmsLayer.ServiceInfo is loaded correctly after initialization. I try to add it to my map with the following code where "vaki2011_1km" is the layer name from service ( http://geo.stat.fi/geoserver/vaestoruutu/wms?service=wms&%20version=1.3.0&request=GetCapabilities ).

            var wmslayer = new WmsLayer(new Uri("http://geo.stat.fi/geoserver/vaestoruutu/wms?"))
            {
                DisplayName = "Väestöruutuaineisto",
                IsVisible = true,
              
            };
            
            wmslayer.Layers = new[] {"vaki2011_1km"};
            wmslayer.ImageFormat = "image/png";
            await wmslayer.InitializeAsync();
           
            Map.Layers.Insert(0, wmslayer);

My map spatial reference is EPSG:3067 and the WMS Service supports it. What can possibly go wrong here? I tried to publish a simple own WMS service on ArcGIS server and added it to my map same way and it worked fine.

Re: WMS-layer problem

DominiqueBroux — Fri, 13 Feb 2015 15:02:35 GMT

Looks like a server issue when using the SR 3067 which is supposed to be supported.

With the geographic SR 4326, the server returns the correct image.

With SR 3067, it returns a blank image.

The workaround might be to use a map in geographic coordinates.

Re: WMS-layer problem

TuukkaJärvinen — Mon, 16 Feb 2015 08:24:08 GMT

The server returns correct image with SR 3067 if the bounding box is set correctly.

http://geoserv.stat.fi:8080/geoserver/vaestoruutu/ows?SERVICE=WMS&REQUEST=GetMap&WIDTH=1921&HEIGHT=1018&FORMAT=image%2Fpng&LAYERS=vaki2011_1km&STYLES=&BGCOLOR=0xFFFFFF&TRANSPARENT=TRUE&VERSION=1.3.0&CRS=EPSG:3067&BBOX=46167.837979319,6629395.36843484,762231.492641991,7810900.49878568

I'm still wondering what causes it not to be drawn on the map after adding it as WmsLayer.

Re: WMS-layer problem

TuukkaJärvinen — Mon, 16 Feb 2015 11:22:37 GMT

I actually noticed that the API calls WMS with the following:

http://geoserv.stat.fi:8080/geoserver/vaestoruutu/ows?SERVICE=WMS&SERVICE=WMS&REQUEST=GetMap&WIDTH=1185&HEIGHT=588&FORMAT=image%2Fpng&LAYERS=vaki2011_1km&STYLES=&BGCOLOR=0xFFFFFF&TRANSPARENT=TRUE&VERSION=1.3.0&CRS=EPSG:102139&BBOX=185176.859238558,6948504.12867242,773049.442264974,7240207.99265514

which returns this:

"Error occurred decoding the espg code urn:x-ogc:def:crs:EPSG:102139 No code "EPSG:102139" from authority "European Petroleum Survey Group" found for object of type "IdentifiedObject"."

If it would send the request with EPSG:3067 which is the spatial reference of my map, the request would work like this:

http://geoserv.stat.fi:8080/geoserver/vaestoruutu/ows?SERVICE=WMS&SERVICE=WMS&REQUEST=GetMap&WIDTH=1185&HEIGHT=588&FORMAT=image%2Fpng&LAYERS=vaki2011_1km&STYLES=&BGCOLOR=0xFFFFFF&TRANSPARENT=TRUE&VERSION=1.3.0&CRS=EPSG:3067&BBOX=185176.859238558,6948504.12867242,773049.442264974,7240207.99265514

Is there any way to make it use correct SR in the request?

Re: WMS-layer problem

DominiqueBroux — Mon, 16 Feb 2015 14:55:11 GMT

Oh you are right.

Looks like there is a mismatch between 2 equivalent SR (3067 and 102139).

How did you set the map SR?

Re: WMS-layer problem

TuukkaJärvinen — Tue, 17 Feb 2015 10:23:05 GMT

After further testing I actually noticed that the request SR is not dependent on Map.SpatialReference but MapView.SpatialReference. The MapView gets SpatialReference from the first layer that gets added, right? For some reason, if I add FeatureLayer from ArcGIS server that has spatial reference WKID 3067 the MapView.SpatialReference is set to WKID 3067. But when I add ArcGISDynamicMapService layer with the same WKID 3067, the MapView.SpatialReference is set to WKID 102139. Both layers have their spatial references marked as "Spatial Reference: 102139 (3067)" on ArcGIS Server.

What would be the best way to make sure that the MapView.SpatialReference is always 3067?

Re: WMS-layer problem

AnttiKajanus1 — Tue, 17 Feb 2015 10:28:35 GMT

Hey Tuukka,

Can you try to force the SR and see what happens.

MyMapView.Map.SpatialReference = SpatialReference.Create(3067);