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| Subject: | Re: [gislist] Shuttle Radar Topography Mission (SRTM) data |
| Date: |
03/04/2005 12:05:01 PM |
| From: |
Frank Warmerdam |
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On Fri, 04 Mar 2005 12:45:26 -0500, David Emmith <david.emmith@ngc.com> wrote:
> According to the SRTM documentation
> (http://spatialnews.geocomm.com/features/shuttle/srtmdataupdate03/index.html)
> NIMA (now NGA) was to process the SRTM data by putting it into DTED
> format among other things and then give it back to NASA for distribution
> to the public.
>
> "Data are being mosaicked into approximately 15,000 one degree by one
> degree cells and formatted according to the Digital Terrain Elevation
> Data (DTED) specification for delivery to NIMA, who will use it to
> update and extend their DTED products. ... Following these "finishing"
> steps data will be returned to NASA for distribution to the scientific
> and civil user communities, as well as the public."
>
> I have downloaded several zip files from the United_States_1arcsec
> folder at ftp://e0mss21u.ecs.nasa.gov/srtm/. After unzipping them I end
> up with file names that look like this one for example: N31W110.hgt.bin
David,
These .hgt files are raw 3601x3601 16bit signed integer data files.
Any software that supports importing raw binary raster data should
be able to support them after appropriate manual file description.
If you wanted to convert lots automatically you could write a script.
Amoung others my GDAL utilities support converting raw files to
DTED though there would be some work involved.
> What happened to the DTED files that I thought I was going to get? Is
> there a conversion utility out there that will convert these .bin files
> to .dt1 or .dt2 files?
I read the announcement as saying that NIMA will be receiving the
data in DTED format, not necessarily tha this form would be made
available to the public during the interim.
Best regards,
--
---------------------------------------+--------------------------------------
I set the clouds in motion - turn up | Frank Warmerdam, warmerdam@pobox.com
light and sound - activate the windows | http://pobox.com/~warmerdam
and watch the world go round - Rush | Geospatial Programmer for Rent
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