[GRASS-user] NASA to release no cost 30m DEMs with world-wide coverage on 29 June

Michael Barton Michael.Barton at asu.edu
Fri Jun 26 11:03:36 EDT 2009

I've tended to consider SRTM to have a slightly better vertical  
accuracy and ASTER DEM to have a better horizontal resolution. There  
are other differences too. ASTER DEMs are created using stereoscopic  
imagery (forward and backward band 3 near IR) and SRTM is radar. So  
ASTER DEMs are affected by clouds and by surface vegetation, and  
pretty much stop at the coast.

C. Michael Barton, Professor of Anthropology
Director of Graduate Studies, School of Human Evolution & Social Change
Director, Center for Social Dynamics & Complexity
Arizona State University

Phone: 480-965-6262
Fax: 480-965-7671
www: <www.public.asu.edu/~cmbarton>

On Jun 26, 2009, at 12:48 AM, Micha Silver wrote:

> Thanks, Michael. That's great news.
> What do you make of the 20 m./30 m. vertical/horizontal accuracy  
> statement?
> Isn't SRTM supposed to be around 15 m. vertical and <10 m. horizontal
> (even tho' it's 90 m. resolution)?
> Regards,
> Micha
> Michael Barton wrote:
>> See the following announcement. NASA (USA) will release high
>> resolution DEM's of the globe, produced from the Terra ASTER
>> satellite, at no charge. You can check out the web announcement at
>> <https://lpdaac.usgs.gov/lpdaac/about/news_archive/monday_june_22_20092 
>> >.
>> As a Terra ASTER user, I'

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