[GRASSLIST:4491] Re: hgt to bil (SRTM)
neteler at itc.it
Fri Oct 8 08:25:40 EDT 2004
On Wed, May 17, 2006 at 11:50:51AM +0200, ivan marchesini wrote:
> Dear Users,
> I'm trying to understand how to create the hdr file for the .bil srtm
> dem I downloaded....
> I have found too much different information...
In fact, there are many wrong documents in the Web.
Even the USGS docs were silently (!) fixed in December 2003.
> so I try with you....:
> if I have a N11E044.hgt file I have to rename the file to N11E044.bil
> and then to create a N44E011.hdr file...
- SRTM filename coordinates are said to be the *center* of the LL pixel.
N51E10 -> lower left cell center
- BIL uses *center* of the UL (!) pixel:
- GDAL uses *corners* of pixels for its coordinates (?)
Please have a look at
where you can grab ready-to-use scripts:
srtm_generate_hdr.sh: general shell script to make GeoTIFF from original
SRTM90 files. Requires GDAL tools to be installed.
r.in.srtm: GRASS script to import original SRTM files. Requires above script
to be installed in PATH. Fixes the INTEGER encoding, applies color table.
To use in Lat/Long LOCATIONS (WGS84, to be precise EGM96).
Even the NASA is using it :-)
Hope this helps
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