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Coordinate Converters

Updated on Mar 26, 2026

By default all of built-in RadMap providers (such as OpenStreetMap) use the standard Mercator projection. When reading shape files with different projections, then you can use a coordinate converter. To do this, set the CoordinateConverter property of MapShapeReader.

The RadMap contains two built-in converters which convert coordinates from EPSG:27700 and EPSG:3857 to EPSG:4326 projection.

OSGB36Converter
EPSG900913Converter

The converter (OSGB36Converter/ EPSG900913Converter) can be specified by setting it to the MapShapeReader.CoordinateConverter property.

Example 1: Setting CoordinateConverter property

XAML

<dataVisualization:RadMap>
	<dataVisualization:RadMap.Providers>
		<telerikMap:OpenStreetMapProvider />
	</dataVisualization:RadMap.Providers>
	<telerikMap:VisualizationLayer >
		<telerikMap:VisualizationLayer.Reader>
			<telerikMap:AsyncShapeFileReader >
				<telerikMap:AsyncShapeFileReader.CoordinateConverter>
					<telerikMap:EPSG900913Converter />
				</telerikMap:AsyncShapeFileReader.CoordinateConverter>
			</telerikMap:AsyncShapeFileReader>
		</telerikMap:VisualizationLayer.Reader>
	</telerikMap:VisualizationLayer>
</dataVisualization:RadMap>

Custom Coordinate Converter

The API of the RadMap allows you to use a custom coordinate converter by implementing the ICoordinateConverter interface.

Example 2: Implement ICoordinateConverter

public class CustomCoordinateConverter : ICoordinateConverter
{
	public LocationCollection ConvertBack(LocationCollection collection)
	{			
		return new LocationCollection();
	}

	public LocationCollection ConvertTo(LocationCollection collection)
	{
		return new LocationCollection();
	}

	public Location FromLocation(Location location)
	{
		return new Location();
	}

	public Location ToLocation(object coordinates)
	{
		return new Location();
	}

	public string ToString(Location location)
	{
		return location.ToString();
	}
}

The custom coordinate converter can be assigned to the MapShapeReader.CoordinateConverter property.

Example 3: Setting CustomCoordinateConverter in XAML