Greetings
I have a bitmask raster (ones and nulls) and I want to eliminate patches, with values of 1, that have an area smaller than X ha (or X pixels). How can I do this in GRASS (without having to convert to vector)
THanks
Luisa
Hi Luisa,
I wrote a script that does exactly what you want to do. It uses r.clump, r.stats, and r.reclass in addition to some bash coding to make the input file for r.reclass from the r.stats output minus the clumps below your threshold size. Let me know if you want me to send you the code.
I’d be interested if anyone has a better solution.
Best,
Nick
On Tue, Oct 4, 2011 at 12:57 AM, Luisa Peña <luisapena1979@gmail.com> wrote:
Greetings
I have a bitmask raster (ones and nulls) and I want to eliminate patches, with values of 1, that have an area smaller than X ha (or X pixels). How can I do this in GRASS (without having to convert to vector)
THanks
Luisa
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On Mon, Oct 3, 2011 at 6:57 PM, Luisa Peña <luisapena1979@gmail.com> wrote:
Greetings
I have a bitmask raster (ones and nulls) and I want to eliminate patches,
with values of 1, that have an area smaller than X ha (or X pixels). How can
I do this in GRASS (without having to convert to vector)
Try
http://grass.osgeo.org/gdp/html_grass64/r.reclass.area.html
Markus