On Mon, 17 Jan 2011 20:24:40 +0200, clipka <ano### [at] anonymousorg> wrote:
> Am 17.01.2011 15:59, schrieb Nekar Xenos:
>> It would be wonderful if we could use .dem and .hgt formats for
>> heightfields as these are the native file formats for terrain data.
> Do you have a source for file format documentation? A (not necessarily
> complete) list of software that generates files in this format might be
> interesting, too.
Maybe this will help:
"Height files have the extension .HGT and are signed two byte integers.
bytes are in Motorola "big-endian" order with the most significant byte
directly readable by systems such as Sun SPARC, Silicon Graphics and
DEC Alpha and most PCs use Intel ("little-endian") order so some
may be necessary. Heights are in meters referenced to the WGS84 geoid.
voids are assigned the value -32768."
"GDAL includes support for reading USGS SDTS formatted DEMs. USGS DEMs are
always returned with a data type of signed sixteen bit integer, or 32bit
float. Projection and georeferencing information is also returned.
SDTS datasets consist of a number of files. Each DEM should have one file
with a name like XXXCATD.DDF. This should be selected to open the dataset.
The elevation units of DEMs may be feet or meters. The GetType() method on
a band will attempt to return if the units are Feet ("ft") or Meters
Maybe you can also find more info here: http://grass.osgeo.org/
"The spoon is not real"
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