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[Jolly]

With reference to the “Sample2:Niagara Falls With Seasons" indicated into the document “Creating Custom Terrain Texture" of the Tool Terrain_SDK, please could someone help me to understand the meaning and the usage of the following parameters and were can I found the relevant values:
. Ids of the LOD13 quadtree cells inside the corners of the scenary area:
Northwest: U=6889 V=4269
Southeast: U=6891 V=4272
. The calculation of lat/lon bounds in degrees of the scenary area:
North = 90 – 4269*(90/2^13)
South = 90 – (4272+1)*(90/2^13)
Etc. etc.
. Source pixel cell dimensions in degree:
Xdim = (6891-6889+1)*(120/2^13)/768
Ydim = (4272-4269+1)*(90/2^13)/1024

Thank you