The Unofficial XCSoar Manual
Reference:Filetype/xct
From XCSoar
The terrain file (extension .dat) is a raster digital elevation model represented as an array of elevations in meters on a latitude/longitude grid. The format used is unique to XCSoar as it contains a header containing the grid geometry followed by the raster array.
Terrain files for various regions can be obtained from the XCSoar website. Additional terrain files can be produced upon request.
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