Coordinate Converters

Updated on Sep 23, 2026

By default all of built-in RadMap providers (AzureMapProvider, OpenStreetMapProvider) 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

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

C#

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

XAML

<telerik:RadMap>
    <telerik:RadMap.Providers>
        <telerik:OpenStreetMapProvider />
    </telerik:RadMap.Providers>
    <telerik:VisualizationLayer >
        <telerik:VisualizationLayer.Reader>
            <telerik:AsyncShapeFileReader >
                <telerik:AsyncShapeFileReader.CoordinateConverter>
                    <local:CustomCoordinateConverter />
                </telerik:AsyncShapeFileReader.CoordinateConverter>
            </telerik:AsyncShapeFileReader>
        </telerik:VisualizationLayer.Reader>
    </telerik:VisualizationLayer>
</telerik:RadMap>

See Also

• Navigation
• Zoom Modes
• Distance and Scale
• Mouse Location
• Default Layout