Currently the custom map provider for the map control should keep the following restrictions:
- Each tile should have a pixel size as 256 x 256
- Tiles should cover a world map with a grid of the following ranges of geographical coordinates:
-85 to 85 latitude,
-180 to 180 longitude.
- Tiles should cover a world map according to deep zoom concept
The width and height of whole map in tiles is calculated as 2 ^ zoom level. For example the zoom level 1 should contain 4 tiles. Zoom level 2 should contain 16 etc.
I.e. each tile has the fixed geographical location according to its zoom level and x-y position.For example when the zoom level is 1 (tileLevel is 9) and tilePositionX is 0 and tilePositionY is 0 then the real geographic location of the tile is 85, -180 (lat, lon).
Of course the custom map provider can provide some region only, but the geographic location of tiles should correspond to the rules above.
We are planning to support a custom provider which uses tiles for certain geographic region only, but this feature will be implemented in future releases.
the Telerik team
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