The Silverlight RadMap displays the map images using a standard Silverlight MultiScaleImage control which utilizes a Deep Zoom concept. The WPF version of RadMap uses its own implementation of this control, but also implements the deep zoom concept.
For more information you can take a look at the following articles:
The Deep Zoom
concept relies on the fact that the map size doubles between two consecutive zoom levels. This is why the width and the height of the whole map in tiles is calculated as 2 ^ zoom level
. For example a zoom level of 1 should contain 4 tiles. Zoom level of 2 should contain 16 and so forth.
Therefore it's impossible in RadMap
to use custom resolutions for zoom level as such an approach conflicts with the Deep Zoom
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