ZoomTo layer extent

Question

I have two different layers that I add to my Map control, one with a spatial reference of 102100 and another with spatial reference of 26910.

I thought the Map Control would automatically reproject additional layers to the first added layer (102100 in this case) but when i try to call the following code the ZoomTo fails because the second layer still has the original spatial reference (26910).

Note that the ZoomTo functionality is based upon the code in the ZoomToLayerAction of the Esri library.            if (layer != null && layer.FullExtent != null)             {                 if ((layer.FullExtent.Width > 0.0) || (layer.FullExtent.Height > 0.0))                 {                     this.maplegend.Map.ZoomTo(layer.FullExtent);                 }                 else                 {                     this.maplegend.Map.PanTo(layer.FullExtent.GetCenter());                 }             }

Do I need to use GeometryService to convert the extent to that of the original layer ?

Thanks for clarifying this.

MichaelBranscomb · Accepted Answer

Hi,

The Map control will re-project graphics layers and feature layers but for all other types of service layer the reprojection is handled on the server. The spatial reference of the service itself and the spatial reference of the full extent property remain unaffected and it is just the image rendered by the server which is re-projected. This means you will need to consider getting the envelope and using a LocalGeometryService or online GeometryServer to perform the reprojection before calling zoom to.

Cheers

Mike