Thomas,
I would start by creating a colour table with each group containing the same
shade of grey. This will ease the polygonization by avoiding duplicates.
There will be three or four (RGB/RGBA) bands from the colour table but you
can just consider one band during polygonization.
On Tue, May 4
Hello,
I try to get a dissolved shapefile out of a large raster file (Erdas
img) using Python. The raster file contains values from lets say 1 to
100. What I need is a shapefile that contains just five groups where
1-20 get the value 1, 21-40 the value 2 and so on.
What I've done so far are the f