[GRASS-user] Using i.atcorr on SPOT4 and SPOT5 imagery

[Cody Schank]

Hey Markus,

Thanks very much for the clarification.  It also appears (from reading) the
wiki article, that any value entered in the input file will be overridden
by the DEM raster values (as one would expect).

One other thing.  For the input range, is it necessary to put the actual
range of the input radiance values (range usually about 0 to 150).  If I
leave it as 0,255 I get different output values.  Just want to clarifiy the
significance of that input field.

Best,
Cody

On Tue, Jul 3, 2012 at 7:24 PM, Markus Neteler <neteler at osgeo.org> wrote:

> On Tue, Jul 3, 2012 at 9:12 PM, Cody Schank <codyschank at gmail.com> wrote:
> > I am using i.atcorr on a mix of SPOT4 and SPOT5 imagery.
> >
> > I am having some difficulty with determining the correct inputs into the
> > model.
> >
> > For altitude, I have a raster DEM I want to use.  Should the units be in
> > meters (or kilometers and negative, as I think it should be when using 6s
> > directly)?
>
> It should be a "normal" DEM in meters.
> (Just the notation of the parameters are a bit unusual perhaps).
>
> >  Also, what value should I put in the input text file to indicate
> > that I have a raster I want to use for this parameter.
>
> Please take a look at
> http://grass.osgeo.org/wiki/Atmospheric_correction
>
> Let us know if the documentation should be improved (and how).
>
> Markus
>
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