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What technical parameters were used for caching tiled base maps?

To be compatible with other popular viewers, tiled base maps were cached using tiles that are 256x256 pixels in tile size and 96 DPI resolution, at global scale through 1:18,000.  The cache is made up of over 39 million tiles, and takes over 30 days to regenerate.  For scales larger than 1:18,000, base map services are dynamic and not cached.

Tags: Maps, Topographic, Recreation, Quadrangle, GeoPDF, Scale