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| Subject: | Re: GISList: whole earth DEM needed |
| Date: |
03/28/2002 04:33:22 PM |
| From: |
ðÅÔÒ ûÁÒÙÊ |
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Hi,
As to Shuttle Radar Topography Mission (SRTM, USA-Italy-Germany), in January
2002 NASA and USGS have started to distribute 30-m and 90-m grids currently for
a part of USA at this website:
ftp://edcsgs9.cr.usgs.gov/pub/data/srtm/
It contains also description files, that contain this information: "Data will
be processed on a continent-by-continent basis beginning with North America..."
Of course, even 90-m grids (3-arc seconds) would be better than 1 km grids
(30-arc seconds), but SRTM elevations are rounded to integers. Because of this,
SRTM applicability is essentially restricted (I tested them, and the results
will be published at my website http://come.to/eco4/).
SRTM 90-m grids are obtained by averaging from 30-m grids, but resulting 90-m
grids are again rounded to integers. I believe, this is not the best solution.
By the way, does somebody know, which continent will be the next one ?
Peter Shary
Scientific researcher, and
GIS developer
-----Original Message-----
> From: Silvère Martin-Michiellot [mailto:silvere@digitalbiosphere.com\
> Sent: Monday, March 25, 2002 12:42 PM
> To: gislist@geocomm.com
> Subject: RE: GISList: whole earth DEM needed
>
>
> Hi,
>
>
> >Here's link to what is typically used as a global terrain model (DEM with
> >~1km postings). It's GTOPO30 from USGS, and can be downloaded
> for free from
> >this site.
> >
> >http://edcdaac.usgs.gov/gtopo30/gtopo30.html
>
>
> Site has disappeared or is inaccessible from my home (france).
>
> By the way, what about the 2001 nasa surveying mission data ?
>
>
>
>
> __________________________________________________________________
> ________________________
>
> Silvere Martin-Michiellot builds the Internet future on
> www.digitalbiosphere.com
> __________________________________________________________________
> ________________________
------- original messages -------
From:"Todd Helt" <toddh@telemorphic.com>
To:Silvère Martin-Michiellot <silvere@digitalbiosphere.com>
Cc:<gislist@geocomm.com>
Date:Wed, 27 Mar 2002 15:40:36 -0800
Subject:RE: GISList: whole earth DEM needed
Silvere,
The GTOPO30 site (see link below) is definitely still up, but I have no idea
why you can't access it from your home in France.
You can also purchase the GTOPO30 data from USGS on CD-ROM media for $10 per
CD x 5 CD's.
Here's contact info for ordering data:
EDC DAAC User Services
EROS Data Center
Voice: (605) 594-6116
Fax: (605) 594-6963
E-mail: edc@eos.nasa.gov
I wouldn't recommend holding your breath waiting for a new "near" global
elevation data set from NASA. If you are talking about the Shuttle Radar
Topography Mission (http://www.jpl.nasa.gov/srtm/dataprod.htm), here's some
idea of what to expect (quote from NASA-JPL's website):
"Ultimately, the final released SRTM Digital Elevation Models will be at 30
meters for the United States and at 90 meters for the rest of the world,
although NASA and NIMA are still discussing these issues"
Only some data samples have been released so far, and as I understand it
none of these are considered final products. I am not aware of the schedule
for release or distribution of any of the SRTM products.
If I am wrong about this, somebody please correct me and shed some light on
the subject.
Todd
----------------------------------------------
Todd F. Helt
President
Telemorphic, Incorporated
748 Gilman Street
Berkeley, CA 94710-1327
Ph: (510) 527-8343
Fax: (510) 527-8364
toddh@telemorphic.com
www.telemorphic.com
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