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A new ASTER Global DEM data set

Tomislav Hengl 
Hi all,

FYI: I've run a small comparison between ASTER DEM and LIDAR DEMs (say 'true' topography):

http://geomorphometry.org/content/gdem-quick-assessment 

The 4 case studies can be downloaded from here:

http://geomorphometry.org/system/files/GDEM_assessment.zip 

I'm not too happy with what I've got - GDEM shows very strange patterns in area of low relief and I
definitively think that the 30 m resolution is overoptimistic; it should be degraded to 60-90 m
(this would enhance the data sharing and save them a lot of trouble). The positional accuracy of
GDEM is on the other hand pretty good.

GDEM is a frankestein - once you zoom in and add some shading, you can see the stitches, so have
this in mind (unlike SRTM DEM which is a complete and a consistent project; but also noisy in many
areas). 

T. Hengl
http://home.medewerker.uva.nl/t.hengl/

Thread (11 messages)

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