topic Extent/InitialExtent Behavior in ArcGIS API for Silverlight Questions

Extent/InitialExtent Behavior

LanceCrumbliss — Sun, 11 Apr 2010 15:49:11 GMT

hi all,

what is the easiest way to set the extent of MyMap (that has a set SpatialReference due to MyMap.Layers(0) being a Bing.TileLayer) to the InitialExtent of an ArcGISDynamicMapServiceLayer contained within it (say, MyMap.Layers(1) for example) that has a different SpatialReference? I was hoping that

MyMap.Extent = (dynamicServiceLayer.InitialExtent)

would take into account and SpatialReference conversions necessary, but that's not the case (understandable, since it's all client-side code. still, i could hope...).

will i need to create a new Envelope and do the conversions using a GeometryService or am i missing something?

lance

Extent/InitialExtent Behavior

dotMorten_esri — Mon, 12 Apr 2010 14:30:13 GMT

Yes you will need to use a GeometryService to project the envelope.
You could write the projection logic yourself on the client, which for Mercator is pretty simple. It's even simpler if your data is in WGS84 geographic coordinates (epsg:4326). In that case you can just use the ESRI.ArcGIS.Client.Bing.Transform classes.

Extent/InitialExtent Behavior

LanceCrumbliss — Wed, 14 Apr 2010 01:31:47 GMT

Yes you will need to use a GeometryService to project the envelope.
You could write the projection logic yourself on the client, which for Mercator is pretty simple. It's even simpler if your data is in WGS84 geographic coordinates (epsg:4326). In that case you can just use the ESRI.ArcGIS.Client.Bing.Transform classes.

thanks morten. on a related note, what if the layer has a custom projection (WKID=0) defined? maybe use the SOAP API for that?