[GRASS-user] Re: r.neighbors modal filter for two raster layers
Revisiting this thread, how do I add in the r.mapcalc command: where if a pixel in the window contains a NULL value, do not count the NULL in computing the mode For example if map 1 has many NULL values while map2 has valid values, juts count the mode within map2. This way I can patch areas where map1 has NULLs. And vise-versa if map2 has many NULLs. The command below is OK when both maps have few NULL values. On Fri, Jan 30, 2009 at 3:31 PM, maning sambale emmanuel.samb...@gmail.com wrote: Well, it should be , r.mapcalc test_andmode = mode (map1[-1,-1] , map1[-1,0] , map1[-1,1] , map1[0,-1] , map1[1,-1] , map1[1,1] , map1[0,0] , map1[0,1] , map1[-1,0] , map2[-1,-1] , map2[-1,0] , map2[-1,1] , map2[0,-1] , map2[1,-1] , map2[1,1] , map2[0,0] , map2[0,1] , map2[-1,0]) On Fri, Jan 30, 2009 at 2:16 PM, maning sambale emmanuel.samb...@gmail.com wrote: What operator in mapcalc should I use to evaluate a mode from a given window: r.mapcalc test_andmode = mode (map1[-1,-1] map1[-1,0] map1[-1,1] map1[0,-1] \ map1[1,-1] map1[1,1] map1[0,0] map1[0,1] map1[-1,0] map2[-1,-1] map2[-1,0] \ map2[-1,1] map2[0,-1] map2[1,-1] map2[1,1] map2[0,0] map2[0,1] map2[-1,0]) Is the correct to list values? On Fri, Jan 30, 2009 at 11:53 AM, maning sambale emmanuel.samb...@gmail.com wrote: Hi, Any ideas in doing this: I want to get the mode of raster categorical values for a defined window based on 2 raster layers. For example, I set a window of 5x5, so I get mode value from 50 pixels (25 for raster a and 25 for raster 2). -- cheers, maning -- Freedom is still the most radical idea of all -N.Branden wiki: http://esambale.wikispaces.com/ blog: http://epsg4253.wordpress.com/ -- -- cheers, maning -- Freedom is still the most radical idea of all -N.Branden wiki: http://esambale.wikispaces.com/ blog: http://epsg4253.wordpress.com/ -- -- cheers, maning -- Freedom is still the most radical idea of all -N.Branden wiki: http://esambale.wikispaces.com/ blog: http://epsg4253.wordpress.com/ -- -- cheers, maning -- Freedom is still the most radical idea of all -N.Branden wiki: http://esambale.wikispaces.com/ blog: http://epsg4253.wordpress.com/ -- ___ grass-user mailing list grass-user@lists.osgeo.org http://lists.osgeo.org/mailman/listinfo/grass-user
[GRASS-user] Re: r.neighbors modal filter for two raster layers
Again (doh!) answering to my own query. use r.series method=mode my grass module of the day! On Thu, Apr 16, 2009 at 4:51 PM, maning sambale emmanuel.samb...@gmail.com wrote: Revisiting this thread, how do I add in the r.mapcalc command: where if a pixel in the window contains a NULL value, do not count the NULL in computing the mode For example if map 1 has many NULL values while map2 has valid values, juts count the mode within map2. This way I can patch areas where map1 has NULLs. And vise-versa if map2 has many NULLs. The command below is OK when both maps have few NULL values. On Fri, Jan 30, 2009 at 3:31 PM, maning sambale emmanuel.samb...@gmail.com wrote: Well, it should be , r.mapcalc test_andmode = mode (map1[-1,-1] , map1[-1,0] , map1[-1,1] , map1[0,-1] , map1[1,-1] , map1[1,1] , map1[0,0] , map1[0,1] , map1[-1,0] , map2[-1,-1] , map2[-1,0] , map2[-1,1] , map2[0,-1] , map2[1,-1] , map2[1,1] , map2[0,0] , map2[0,1] , map2[-1,0]) On Fri, Jan 30, 2009 at 2:16 PM, maning sambale emmanuel.samb...@gmail.com wrote: What operator in mapcalc should I use to evaluate a mode from a given window: r.mapcalc test_andmode = mode (map1[-1,-1] map1[-1,0] map1[-1,1] map1[0,-1] \ map1[1,-1] map1[1,1] map1[0,0] map1[0,1] map1[-1,0] map2[-1,-1] map2[-1,0] \ map2[-1,1] map2[0,-1] map2[1,-1] map2[1,1] map2[0,0] map2[0,1] map2[-1,0]) Is the correct to list values? On Fri, Jan 30, 2009 at 11:53 AM, maning sambale emmanuel.samb...@gmail.com wrote: Hi, Any ideas in doing this: I want to get the mode of raster categorical values for a defined window based on 2 raster layers. For example, I set a window of 5x5, so I get mode value from 50 pixels (25 for raster a and 25 for raster 2). -- cheers, maning -- Freedom is still the most radical idea of all -N.Branden wiki: http://esambale.wikispaces.com/ blog: http://epsg4253.wordpress.com/ -- -- cheers, maning -- Freedom is still the most radical idea of all -N.Branden wiki: http://esambale.wikispaces.com/ blog: http://epsg4253.wordpress.com/ -- -- cheers, maning -- Freedom is still the most radical idea of all -N.Branden wiki: http://esambale.wikispaces.com/ blog: http://epsg4253.wordpress.com/ -- -- cheers, maning -- Freedom is still the most radical idea of all -N.Branden wiki: http://esambale.wikispaces.com/ blog: http://epsg4253.wordpress.com/ -- -- cheers, maning -- Freedom is still the most radical idea of all -N.Branden wiki: http://esambale.wikispaces.com/ blog: http://epsg4253.wordpress.com/ -- ___ grass-user mailing list grass-user@lists.osgeo.org http://lists.osgeo.org/mailman/listinfo/grass-user
[GRASS-user] Re: r.neighbors modal filter for two raster layers
What operator in mapcalc should I use to evaluate a mode from a given window: r.mapcalc test_andmode = mode (map1[-1,-1] map1[-1,0] map1[-1,1] map1[0,-1] \ map1[1,-1] map1[1,1] map1[0,0] map1[0,1] map1[-1,0] map2[-1,-1] map2[-1,0] \ map2[-1,1] map2[0,-1] map2[1,-1] map2[1,1] map2[0,0] map2[0,1] map2[-1,0]) Is the correct to list values? On Fri, Jan 30, 2009 at 11:53 AM, maning sambale emmanuel.samb...@gmail.com wrote: Hi, Any ideas in doing this: I want to get the mode of raster categorical values for a defined window based on 2 raster layers. For example, I set a window of 5x5, so I get mode value from 50 pixels (25 for raster a and 25 for raster 2). -- cheers, maning -- Freedom is still the most radical idea of all -N.Branden wiki: http://esambale.wikispaces.com/ blog: http://epsg4253.wordpress.com/ -- -- cheers, maning -- Freedom is still the most radical idea of all -N.Branden wiki: http://esambale.wikispaces.com/ blog: http://epsg4253.wordpress.com/ -- ___ grass-user mailing list grass-user@lists.osgeo.org http://lists.osgeo.org/mailman/listinfo/grass-user
[GRASS-user] Re: r.neighbors modal filter for two raster layers
Well, it should be , r.mapcalc test_andmode = mode (map1[-1,-1] , map1[-1,0] , map1[-1,1] , map1[0,-1] , map1[1,-1] , map1[1,1] , map1[0,0] , map1[0,1] , map1[-1,0] , map2[-1,-1] , map2[-1,0] , map2[-1,1] , map2[0,-1] , map2[1,-1] , map2[1,1] , map2[0,0] , map2[0,1] , map2[-1,0]) On Fri, Jan 30, 2009 at 2:16 PM, maning sambale emmanuel.samb...@gmail.com wrote: What operator in mapcalc should I use to evaluate a mode from a given window: r.mapcalc test_andmode = mode (map1[-1,-1] map1[-1,0] map1[-1,1] map1[0,-1] \ map1[1,-1] map1[1,1] map1[0,0] map1[0,1] map1[-1,0] map2[-1,-1] map2[-1,0] \ map2[-1,1] map2[0,-1] map2[1,-1] map2[1,1] map2[0,0] map2[0,1] map2[-1,0]) Is the correct to list values? On Fri, Jan 30, 2009 at 11:53 AM, maning sambale emmanuel.samb...@gmail.com wrote: Hi, Any ideas in doing this: I want to get the mode of raster categorical values for a defined window based on 2 raster layers. For example, I set a window of 5x5, so I get mode value from 50 pixels (25 for raster a and 25 for raster 2). -- cheers, maning -- Freedom is still the most radical idea of all -N.Branden wiki: http://esambale.wikispaces.com/ blog: http://epsg4253.wordpress.com/ -- -- cheers, maning -- Freedom is still the most radical idea of all -N.Branden wiki: http://esambale.wikispaces.com/ blog: http://epsg4253.wordpress.com/ -- -- cheers, maning -- Freedom is still the most radical idea of all -N.Branden wiki: http://esambale.wikispaces.com/ blog: http://epsg4253.wordpress.com/ -- ___ grass-user mailing list grass-user@lists.osgeo.org http://lists.osgeo.org/mailman/listinfo/grass-user
