[GRASS-user] Correction of terrain effects for MODIS data?

[Nikos Alexandris]

Hi!

Will this approach enable a correction for terrain as well? I don't see
how I can incorporate elevation data or anything relevant.

I used the cosine correction approach which is described in GRASS-GIS in
order to correct a MODIS image. But the result is over-corrected (!) as
mentioned also in the book.

I am looking for a practical approach in order to minimize terrain
effects in a MODIS NIR surface reflectance acquisition. The area in
which I am interested to visually identify the land cover, is
mountainous. So any correction would be of great importance.

Thank you in advance.

On Fri, 2007-11-30 at 15:10 -0800, Hamish wrote:
> Nikos Alexandris wrote:
> > I tried to follow the example for correction of terrain effects in a MODIS
> > surface reflectance NIR band 
> > (...as far as I know, MODIS surface reflectance imagery is only corrected
> > for atmospheric effects).
> > 
> > I don't get the desired results... The output is too bright from what one
> > would expect it to be.
> > 
> > Any recommendations?
> 
> I've never used it for MODIS, but you could try i.landsat.rgb to see if that
> helps. (it wants three 0-255 bands, it doesn't care about it being LANDSAT or
> not)
> 
> 
> Hamish
> 
> 
> 
>       ____________________________________________________________________________________
> Never miss a thing.  Make Yahoo your home page. 
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-- 
Nikos Alexandris
.
Department of Remote Sensing & Landscape Information Systems
Faculty of Forestry & Environmental Sciences, Albert-Ludwigs-University Freiburg
.
Tel.  +49 (0) 761 203 3697 / Fax.  +49 (0) 761 203 3701 / Skype: Nikos.Alexandris
.
Address: Tennenbacher str. 4, D-79106 Freiburg i. Br., Germany
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