Extent/InitialExtent Behavior

Question

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 thatMyMap.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

chuckyboy81070 · Answer

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?

SomeGISGuy · Answer

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.