[GRASSLIST:7793] RE: SRTM DEM data validation (Not a GRASS specific thread)

Jonathan Greenberg jgreenberg at arc.nasa.gov
Thu Aug 4 20:05:35 EDT 2005


Armando:

	I think the easiest way to do it is to take the DEM value and your
own measurements and do a regression between the two.  If there's a tight
fit (low R2) then you can use the slope and offset to correct one set of
data to "fit" another.

--jb

--

Jonathan A. Greenberg, PhD
NRC Research Associate
NASA Ames Research Center
MS 242-4
Moffett Field, CA 94035-1000
Office: 650-604-5896
Cell: 415-794-5043
AIM: jgrn307
MSN: jgrn307 at hotmail.com
-----Original Message-----
From: owner-GRASSLIST at baylor.edu [mailto:owner-GRASSLIST at baylor.edu] On
Behalf Of Armando Scalise
Sent: Thursday, August 04, 2005 3:02 PM
To: GRASS international
Subject: [GRASSLIST:7792] SRTM DEM data validation (Not a GRASS specific
thread)

HI.

I have downloaded an SRTM DEM (3 arc sec) for parts of Patagonia.

I need to validate the DEM against my own set of topographic data.  I 
would like to get pointers to documents describing validation methods.  
Anyone in this list who can provide leads and hints to access available 
documentation?

Thanks

Armando Scalise




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