Real size in Buffers

[EnriqueIbarra]

I'm using the Geometry Service to create Buffers:

gmtrySrvcBuffers = new GeometryService("http://tasks.arcgisonline.com/ArcGIS/rest/services/Geometry/GeometryServer");                 gmtrySrvcBuffers.BufferCompleted += gmtrySrvcBuffers_BufferCompleted;                 BufferParameters bufferParams = new BufferParameters() { BufferSpatialReference = Variables.Mapa.SpatialReference, OutSpatialReference = Variables.Mapa.SpatialReference, Unit = LinearUnit.Meter };

Note that the spatial references are defined from the base Map.

And the MeasureAction to display the radio of a circle:

<esri:MeasureAction AreaUnit="SquareMeters" DisplayTotals="True" DistanceUnit="Meters" MapUnits="Meters" MeasureMode="Radius" FillSymbol="{StaticResource DefaultFillSymbol}" TargetName="MyMap" />

in both cases the units are Meters.

Once buffer created (with a value of 1000, from a text of a TextBox converted to Double, for the radio), I use the MeasureAction and the result is:

[ATTACH=CONFIG]23608[/ATTACH]

What I'm doing wrong? why the measures aren't equals?'

[DominiqueBroux]

With these buffer params, the geometry service is doing euclidian 2D calculation.
So it's not taking care of the Web Mercator distorsion (about cos(latitude)).

From 3.1, the Geometry Service has a new geodesic parameter  in order to generate a buffer polygon using a geodesic distance (but your coordinates have also to be in GCS)

[EnriqueIbarra · Accepted solution]

Thanks Dominique! I've solved the problem. Just used the Spatial Reference of the sample http://resources.arcgis.com/en/help/silverlight-api/samples/start.htm#BufferQuery