[GRASSLIST:7413] Re: ERDAS Atcor vs. i.atcor

[Jonathan Greenberg]

Martin:

    I'd recommend also posting this question to the Remote Sensing listserv
I moderate at UC Davis: http://www.cstars.ucdavis.edu/starserv .  We have a
lot of people use ATCOR and other image calibration programs on this
listserv!  Please post your responses if and when you get them to this list,
I'm interested in hearing what you find out!

--j


On 7/1/05 5:02 AM, "Grit Schuster"
<grit.schuster at geographie.uni-freiburg.de> wrote:

> Hi Martin,
> 
> I can't tell you anything about the goodness or performance.
> 
> I just know that the moduls use different algorithms.
> Atcor for ERDAS uses MODTRAN. The Grass module uses 6S.
> 
> 
> As far as I know, MODTRAN is quite widely used.
> 
> The method to use for an atmospheric correction depends on
> different factors:
> on the kind of the atmospheric input data, the sensor, the spectral
> bands you want to correct and of course on the purpose of your data
> analyses.
> 
> An interesting document about the atmospheric correction of ASTER data
> is provided by the NASA
> http://eospso.gsfc.nasa.gov/eos_homepage/for_scientists/atbd/docs/ASTER/atbd-a
> st-09t.pdf.
> I think this gives a good overview about the relevance of the different
> parameters used for atmospheric corrections and their influence on the
> accuracy of the results.
> 
> You could post this topic to the Applied GIS & RS mailing list
> (http://www.matox.com/agisrs/).
> 
> If you'll find out something, I would quite interested in it :-)
> 
> Sorry that I can't tell you more. Hope this helps a bit!
> 
> Grit
> 
> 
> Martin Wegmann wrote:
> 
>> Hello, 
>> 
>> I wonder if somebody can judge the goodness of performance for the output of
>> ERDAS Atcor (http://www.geosystems.de/atcor/) vs. GRASS i.atcor
>> (http://www.cs.sun.ac.za/~caz/6S/i.atcorr.html). Are their methods comparable
>> at all? I am not experienced in atmospheric correction and hence all the
>> algorithm are rather meaningless to me.
>> 
>> Any links, papers, comparisons etc. are welcome, thanks in advance, Martin
>> 
> 


-- 
Jonathan A. Greenberg, PhD
NRC Research Associate
NASA Ames Research Center
MS 242-4
Moffett Field, CA 94035-1000
650-604-5896
AIM: jgrn307
MSN: jgrn307 at hotmail.com