[Gdal-dev] how to read SRTM files

[Ethan Alpert]

Looks like you're grabbing the "unfinished" data. 

>From the Documentation directory:
ftp://e0dps01u.ecs.nasa.gov/srtm/Documentation/QuickStart.txt

"Height files have the extension .HGT and are signed two byte integers.
The
bytes are in Motorola "big-endian" order with the most significant byte
first,
directly readable by systems such as Sun SPARC, Silicon Graphics and
Macintosh.
DEC Alpha and most PCs use Intel ("little-endian") order so some
byte-swapping
may be necessary. Heights are in meters referenced to the WGS84 geoid.
Data
voids are assigned the value -32768."

You're going to need to do some processing before you can use these
files.

-e



-----Original Message-----
From: gdal-dev-bounces at xserve.flids.com
[mailto:gdal-dev-bounces at xserve.flids.com] On Behalf Of Eduardo Patto
Kanegae
Sent: Monday, December 13, 2004 11:42 AM
To: freegis-list at intevation.de; gdal-dev at remotesensing.org
Subject: [Gdal-dev] how to read SRTM files


Hi folks,

I'm downloading SRTM NASA ziped files from 
ftp://e0dps01u.ecs.nasa.gov/srtm/South_America/ but I saw that I don't 
know this file format(.hgt)

runnig "gdalinfo" one .hgt file I only got:

ERROR 4: `N01W050.hgt' not recognised as a supported file format.

GDALOpen failed - 4
`N01W050.hgt' not recognised as a supported file format.

Or my GDAL tools is missing something?

Is there any free software that can read this files?

thanks

-- 
Eduardo Patto Kanegae
http://www.webmapit.com.br
Treinamento & Consultoria em UMN MapServer e FreeGIS Software
ICQ: 303747254
MSN: eduardo_patto~at~hotmail.com
+55(16)9994-2928

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