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Answer:
For the topography and land usage maps WinProp supports the formats as mentioned under:http://www.awe-communications.com/Databases/Topo.html
Some free DEM data (topography) in a supported format with a resolution of approx. 100m can be obtained via:http://dds.cr.usgs.gov/srtm/version1/United_States_1arcsec/
