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QuadKey
=======
The QuadKey plugin is useful for reading web map tile repositories
that follow the Bing_ maps tile system. It is assumed that the
dataset is in spherical-mercator with 2x2 tiles at the root just like Bing.
Example usage::
<image name="imagery" driver="quadkey">
<url>http://[1234].server.com/tiles/{key}.png</url>
</image>
Creating the URL template:
The square brackets [] indicate that osgEarth should "cycle through" the characters
within, resulting in round-robin server requests. Some services require this.
You will need to provide {key} template within the URL where osgEarth will
insert the quadkey for the tile it's requesting.
Properties:
:url: Location of the tile repository (URL template -- see above)
:profile: Spatial profile of the repository
:format: If the format is not part of the URL itself, you can specify it here.
.. _Bing: http://msdn.microsoft.com/en-us/library/bb259689.aspx
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