Currently the map control allows to display shape files for the following projections:
- The Mercator projection EPSG:4326 (default) that refers to WGS84 as (latitude, longitude) pair coordinates in degrees
- The OSGB-1936 projection which is also known as EPSG:27700
- The EPSG:900913 projection which is also known as EPSG:3857 and Pseudo-Mercator projection that refers to WGS84 as (latitude, longitude) pair coordinates in meters
But note that the OSGB-1936 and EPSG:900913 can be used with empty provider only.
The real imagery services (Bing Maps and Open Street Maps) which are supported by map control provide tile images for Mercator projection only.
The map control allows you to use your own custom projections. You should implement the ISpatialReference interface for creating it. But if you would like to use real world map (not from shape file or from kml), then you must have a map imagery service which is able to return tiles according to this projection. Also it will require creating the custom map provider which will use tiles from this imagery service for showing a map.
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