coordinate_converters.md

title	page_title	description	slug	tags	published	position
Coordinate Converters	Coordinate Converters	This article describes the build-in coordinate converters.	radmap-features-coordinate-converters	osgb36converter, epsg900913converter, coordinateconverter, projection, mercator	true	3

Coordinate Converters

By default all of built-in RadMap providers (Bing Maps, 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.

[XAML] Example 1: Setting CoordinateConverter property

{{region radmap-features-coordinate-converters_0}} 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> {{endregion}}

Custom Coordinate Converter

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

[C#] Example 2: Implement ICoordinateConverter

{{region cs-radmap-features-coordinate-converters_1}} 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();
	}
}

{{endregion}}

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

[XAML] Example 3: Setting CustomCoordinateConverter in XAML

{{region radmap-features-coordinate-converters_2}} 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> {{endregion}}

See Also

• [Navigation]({%slug radmap-features-navigation%})
• [Zoom Modes]({%slug radmap-features-zoom-modes%})
• [Distance and Scale]({%slug radmap-features-dsitance-and-scale%})
• [Mouse Location]({%slug radmap-features-mouse-location%})
• [Default Layout]({%slug radmap-features-default-layout%})