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Global 30m DEM

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#1
frax

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Released the other day... I haven't peeked at the data, though, if you try it out, please report back on how it went, and how it looks! (also if there are any tricks to import it into common software) Would be interesting to hear if there are any holes/anomalies, what the global coverage is, and how it compares to e.g. SRTM. Now I am just waiting for derived projects/products - is anyone up for starting the production of global drainage basins... ?!

NASA/METI released today the 30m global (83degreesNS, ~22600 scenes) ASTER
GDEM, based on 1,264,118 single ASTER dems from 1.4 million scenes in
total. 95% vertical ci: 20 meters, 95% horizontal ci: 30 meters)


http://www.gdem.aster.ersdac.or.jp/

Posted Image


Hugo Ahlenius
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#2
Andrew

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Hi,

My friend showed me this interesting article and product about an ASTER derived DEM (30m...yay!). Good news for all of the people outside the states that couldn't get their hands on 1 arc-second SRTM data. I haven't downloaded it yet but I look forward to playing with it.

Link to article

Andrew

#3
Hans van der Maarel

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I've merged these two threads...
Hans van der Maarel - Cartotalk Editor
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#4
Brandon Tourtelotte

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Andrew,
just as a side note, SRTM was always available as 1arcsec for the US, to anyone in the world. So its the location inside/outside US, not people located inside/outside, that made the differerence
Brandon Tourtelotte
East View Cartographic, Inc.
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#5
Hans van der Maarel

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Finally managed to download some data and play with it. Looks nice so far, but the web interface is very slow and I've only managed to get it working in IE...
Hans van der Maarel - Cartotalk Editor
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#6
Andrew

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Andrew,
just as a side note, SRTM was always available as 1arcsec for the US, to anyone in the world. So its the location inside/outside US, not people located inside/outside, that made the differerence



Hey Brandon,

Yeah I was aware of that, my point was for people who wanted coverage outside the US. Coverage of the US wasn't pariculary useful for my work at home :)

Hans thanks for fixing it up, I got to excited and posted before reading!!

Andrew

#7
Matthew Hampton

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Finally managed to download some data and play with it. Looks nice so far, but the web interface is very slow and I've only managed to get it working in IE...



I've tried twice and never got connected – makes me wish for the days of webGLIS. Perhaps in a week or so the traffic will slow down, however this recent post in the popular Gizmodo website probably garnered a few geo-rubberneckers.

Could this an indication that the digital world is becoming a lot more spatially interested?

co-cartographic creator of boringmaps.com


#8
Andrew

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I've tried twice and never got connected – makes me wish for the days of webGLIS.


I had to go through the WIST Portal to get access, the other site although much friendlier looking kept timing out.

#9
rudy

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Earth Observatory has a posting about the new Aster DEM comparing it to the SRTM DEM and displaying a sample from the Himalayas. Looks impressive so far. I've tried downloading data but the site still seems clogged.

#10
Tom Patterson

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Here are some shaded relief samples rendered from GDEM downloaded from the WIST site, which takes a while to figure out how to navigate. GDEM is unfortunately shot through with holes and is a bit rough much like SRTM. Perhaps merging the two datasets would result in a more useable product.

Tom

www.shadedrelief.com/tom/gdem/comparison.jpg
www.shadedrelief.com/tom/gdem/ruwenzori.jpg
www.shadedrelief.com/tom/gdem/denali.jpg

Edited by Hans van der Maarel, 04 July 2009 - 02:57 AM.
made links


#11
sitesatlas

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Thanks for the samples, Tom. I was able to download a tile from the WIST interface and it didn't have any holes in it, so I was too optimistic...
Michael Borop
World Sites Atlas
http://www.sitesatlas.com

#12
snowgage

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Just started downloading tiles from the GDEM server. When I bring the dem into arcmap values are displayed as -32768 to 32768. How do I get these into meters? I am sure I am missing something obvious but if anyone can help, I'd really appreciate it..

thanks in advance,

Josh

#13
dav

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hey, do you know if the license allows you to create your own map on the basis of the aster elevation data and publish it? or are there some restrictions about that?

edit: problem solved, have seen the notice while downloading, thanks anyway.

thanks, dav

Edited by dav, 03 September 2009 - 07:11 AM.





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