topic Projection Question in ArcGIS API for Silverlight Questions

Projection Question

PaulHuppé — Wed, 08 Sep 2010 14:46:03 GMT

Hi,
I am using the Selection Tool and for some layers, the selected polygons appear way off the map. During debugging, I noticed that the features selected come from a layer which has a different WKID than the map. That is the features.Geometry.SpatialRefenrence is not equal to the Map.SpatialRefenrence.

My question is how do I project the features from their SpatialRefenrence to the map's SpatialReference so that they show up in the correct location on the graphics layer?

Thanks,
Paul

Re: Projection Question

AliMirzabeigi — Wed, 08 Sep 2010 21:07:59 GMT

What if you set the map SpatialReference to what is defined in your GraphicsLayer? You can do so by setting the SpatialReference in your map's initial extent; please see the following sample to get the whole idea:
http://help.arcgis.com/en/webapi/silverlight/samples/start.htm#DefineMapProjection

Re: Projection Question

dotMorten_esri — Wed, 08 Sep 2010 21:13:07 GMT

If you are using the QueryTask, did you set the OutputSpatialReference property to match that of the map?

Re: Projection Question

PaulHuppé — Thu, 09 Sep 2010 10:40:40 GMT

Hi,

I was using the QueryTask, so setting the QueryTask's spatial reference to be equal to the Map's spatial reference worked.

Thanks,
Paul