[GRASSLIST:1168] Re: (no subject)
neteler at geog.uni-hannover.de
Tue Nov 21 14:20:33 EST 2000
On Tue, Nov 21, 2000 at 10:35:45AM +0100, Andrzej Wroblewski wrote:
> Dear grass users
> I have couple problems:
> 1. It's obvious that picture made from satelite in mountain terrain have different illumination of slopes.
> That cause different pixel values on satellite image.
> Is in grass any function elimination that problem?
More or less :-) I have written a module for atmospheric correction and
terrain correction of satellite images:
-> Presentation at Irst/Trento, Italy
I wanted to release these modules already, but don't have much time.
Perhaps I can send a version to you. Please contact me personally.
> 2. Haw to streach contrast in grass?
Try i.grey.scale or r.colors
> 3. r.mapcalc
> when complete writes:
> min values 0, max values0
> (ch1 and ch3 are my landsat band 1 and 3)
> why? what's wrong?
If you are using GRASS 5, floating point numbers are stored *only*
if the right side of the equation has floating points (90.0 instead of
90). Your line should be
Please try this.
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