On 22/10/13 10:56, Nikos Alexandris wrote:
Antonio:
I have two landcover change maps and I wanted to know if there is any
functionality or module that allow us to compare the maps and landcovers?
(e.g. class 1 2 and 3 in both maps and identify the pixels
(Map 1 Map 2)
1 | 1
1 | 2
1 | 3
2 | 1
2 | 2
2 | 3
3 | 1
3 | 2
3 | 3
Nikos:
Have a look at r.cross.
Moritz Lennert wrote:
Or at r.report or r.stats with the two maps as input.
Multiple raster maps fed to r.report! Interesting. The output is quite large
here using two maps with (1 to) 28 or 30 classes each. I am not sure on how to
use this ouput yet. I guess it deserves a short explanation in the manual.
I think r.report output is only useful for few classes or if you are
looking for a specific correspondence of classes. For more advanced
treatment of such crossing of maps, I would use r.stats, saving the
results into a file and then any spreadsheet or other tool of your
choice to visualize or analyze the results.
Moritz
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