[Tilecache] Virtual Earth compatible TC-cache

[Steven M. Ottens]

Hi all,

For those lost souls who want to create a cache which is directly 
compatible with the virtual earth client I've attached a modified 
disk.py, renamed to VE.py. It is written for TC 2.01 and should be put 
in the <tilecache>/Cache folder.

Some information on the VE compatible cache structure:
http://msdn2.microsoft.com/en-us/library/bb259689.aspx

This VE cache is a flat file structure, which means that you need a 
filesystem that can handle thousands of files in a directory. To be 
honest the only reason why you would want to do this is so you can 
directly add a dataset in virtualearth using the new 
VETileSourceSpecification
 and have the files available in a web-accessible directory. The next 
step will be to add a VE layer so you can use tilecache to dynamically 
generate the VE-tiles.

The reason why you want to create VE-specific tiles is to be able to 
view them in 3D (inside the VE viewer).

Regards,
Steven
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