topic Re: Does Silverlight API support on the fly Datum Transformation.... in ArcGIS API for Silverlight Questions

Does Silverlight API support on the fly Datum Transformation....

caseycupp — Wed, 20 Mar 2013 18:07:08 GMT

I am attempting to use the esri steet map as my first map service.. thus setting my Map Control to a spatial Reference of 102100 (Web Mercator)

When I attempt to display an arcgis dynamic layer with a spatial reference of 26745. (NAD_1927_StatePlane_California_V_FIPS_0405) It appears the layer is off by approximately 100 yards.

Is the Map Service with the silverlight API support a datum transformation... and is there a way to specifiy a specific transformation?

Casey

I am drawing a select rectangle, which appears to be based on the base map... as it is selecting items approximately 100 yards to the west of the drawn location.

casey

Re: Does Silverlight API support on the fly Datum Transformation....

caseycupp — Wed, 20 Mar 2013 18:23:23 GMT

Meant to add... this is my primary resource - http://help.arcgis.com/en/webapi/silverlight/apiref/ESRI.ArcGIS.Client~ESRI.ArcGIS.Client.Map~SpatialReference.html

Re: Does Silverlight API support on the fly Datum Transformation....

ChristopherHill — Thu, 21 Mar 2013 16:55:29 GMT

Yes, Silverlight supports datum transform using the projection geometry service, you can consult Silverlight API Reference link below for a detailed example of using projection with datum transform.

http://resources.arcgis.com/en/help/silverlight-api/apiref/ESRI.ArcGIS.Client~ESRI.ArcGIS.Client.Tasks.GeometryService~ProjectAsync(IEnumerable%7BGraphic%7D,SpatialReference,DatumTransform,Boolean,Object).html

Re: Does Silverlight API support on the fly Datum Transformation....

caseycupp — Fri, 22 Mar 2013 16:59:58 GMT

Right, but that is for graphics... that doesn't help me display my Nad27 map service on top of the esri base maps (webmercator from wgs84).... Right???

casey