[GRASS-user] Assess land cover change
Greetings I have 2 land cover maps (1990 and 1995) and I want to detect changes between them and create a change detection matrix. can this be done in GRASS? Regards, Luis Lisboa ___ grass-user mailing list grass-user@lists.osgeo.org http://lists.osgeo.org/mailman/listinfo/grass-user
Re: [GRASS-user] Assess land cover change
On 17/10/12 15:46, Luis Lisboa wrote: Greetings I have 2 land cover maps (1990 and 1995) and I want to detect changes between them and create a change detection matrix. can this be done in GRASS? r.report and r.stats can be used to cross-tabulate two or more raster maps. r.report output is easier to read on-screen, but r.stats output is easier to post-process. Moritz ___ grass-user mailing list grass-user@lists.osgeo.org http://lists.osgeo.org/mailman/listinfo/grass-user
Re: [GRASS-user] Assess land cover change
Thank you Moritz Just one last question: is it possible to produce a raster product that attributes a code/color to a specific land cover change? Regards Luis On Wed, Oct 17, 2012 at 3:25 PM, Moritz Lennert mlenn...@club.worldonline.be wrote: On 17/10/12 15:46, Luis Lisboa wrote: Greetings I have 2 land cover maps (1990 and 1995) and I want to detect changes between them and create a change detection matrix. can this be done in GRASS? r.report and r.stats can be used to cross-tabulate two or more raster maps. r.report output is easier to read on-screen, but r.stats output is easier to post-process. Moritz ___ grass-user mailing list grass-user@lists.osgeo.org http://lists.osgeo.org/mailman/listinfo/grass-user
Re: [GRASS-user] Assess land cover change
On 17/10/12 16:28, Luis Lisboa wrote: Thank you Moritz Just one last question: is it possible to produce a raster product that attributes a code/color to a specific land cover change? One way I can think of immediately would be to code the land covers of the two dates in different order of magnitudes and then sum the two, i.e. year t: 100 forest 200 built-up 300 agriculture year t+n 1 forst 2 built-up 3 agriculture year t + yeart+n (you can do that with r.mapcalc): 101 : forest that remains forest 102 : forest that has become built-up land 301 : agricultural land that has become forest etc But, as always, there are probably many other ways :-). Moritz ___ grass-user mailing list grass-user@lists.osgeo.org http://lists.osgeo.org/mailman/listinfo/grass-user
