STM is an acronym for Shuttle Radar Topography Mission, which is an international effort that obtained digital elevation models on a near global scale on the globe from 56 degrees South to 60 degrees North. STRM consisted of a Radar System which flew on the Endeavour space shuttle. during the STS−99 mission in February 2000.
Elevation models derived from the STRM data can be downloaded freely from the internet. Their file extension is .hgt
and they can be downloaded freely from the internet. SRTM Files can be extracted http://srtm.csi.cgiar.org/SELECTION/inputCoord.asp
ESRI ASC raster format
Rather than being able to parse binary .hgt
files, the Field 3D
manager is able to read the data in ESRI ASCII interchange format.
The ASCII .asc
file has the following file format:
- ncols: number of columns in the tile
- nrows: number of rows in the tile
- xllcorner: the longitude Left Down Corner of the tile
- yllcorner: the latitude Left Down Corner of the tile
- cellsize: the size of latitude / longitude of each cell in the tile
- NODATA_value: the value which will be used in the datas below for a cell which has no valid data
- The list of datas for each cell in the grid
There will be
ncols * nrows cells, each cell having cellsize dimension in latitude onad longitude
436 437 439 440 441 439 437...
Usage in 3D Maps
SRTM Files must be used in ASCII .asc
raster format. Zip Files can directly be used without having to extract them.
- Field 3D: This article explains how the Maps3D framework displays the 3D terrain
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