I would like to know that how to implementation to show the Latitude and Longiitude with mouse move on north-polar stereo map (WKID : 102018) and south-polar stereo map (WKID : 102021) other than calling a geometry service.

I have tried the below code, but can't get correct value.

Please teach me a correct expression.

I have tried the below code, but can't get correct value.

Please teach me a correct expression.

private void map1_MouseMove(object sender, MouseEventArgs e) { if (map1.SpatialReference.WKID == 102018) { System.Windows.Point screenPoint = e.GetPosition(map1); MapPoint mapPoint = map1.ScreenToMap(screenPoint); Double p = Math.Sqrt((mapPoint.Y * mapPoint.Y) + (mapPoint.X * mapPoint.X)); Double lat = Math.Acos(mapPoint.X / p); lat = lat * 180 / Math.PI + 90; Double lon = Math.PI / 2 - Math.Atan(p / (2 * 6378.137 * 1000)); lon = lon * 180 / Math.PI / 2; LatitudeTextBlock.Text = string.Format("Latitude: Y = {0}", lat); LongiitudeTextBlock.Text = string.Format("Longiitude: X = {0}", lon); } }

http://help.arcgis.com/en/webapi/silverlight/samples/start.htm#MouseCoords

That gives you the coordinates, and you will have to add some code to project the coordinates using:

http://help.arcgis.com/en/webapi/silverlight/samples/start.htm#Project

Chris