Re: [GRASS-user] r.mapcalc concatenates values?
Hi Gabriele, using r.mapcalc and the @-operator within the calculation you have access to the labels, but in IF statements it works only on labels that starts with a number (int vals). So looking for a string is not possible. But why not using the cats or int labels(with @) in mapcalc, then asigning a new and unique cat value, following a reclass new_cat_by_mapcalc -- string label? r.mapcalc 'mapA=if((@landuse==1@soils==2),12,null()) r.reclass with something like 12 = 1 forest,loam Dont know if my notes helpful... Regards, Christian. This mail was sent through http://webmail.uni-jena.de ___ grass-user mailing list grass-user@lists.osgeo.org http://lists.osgeo.org/mailman/listinfo/grass-user
[GRASS-user] r.mapcalc concatenates values?
Hi everyone. I have two questions 1) I have some raster (with the same format and are converted from vector). The cells have the value of CAT. So the value = CAT With r.mapcalc I would define a map of output that I give, as the value for each cell, indications of the different CAT. For example, if I have the raster A that has value = 1 and raster B that has value = 2, I will have raster C output value = 1,2 If I have 3 maps in input, value = 1,2,3 etc. ... I made several attempts but I do not know if r.mapcalc concatenates the values. 2) if r.mapcalc is not possible, I tried to make the transition to vector. The passages that I made are: - r.to.vect maps raster input (es rasterA and rasterB) - V.overlay and I get in dbf, in a column the value of rasterA and in another column the value of rasterB. I've created a third column to concatenate the 2 columns but it seems to me that the operator '| |' does not work with dbf. How do I concatenate the values in 2 columns? Thank you very much Gabriele -- View this message in context: http://www.nabble.com/r.mapcalc-concatenates-values--tp19392795p19392795.html Sent from the Grass - Users mailing list archive at Nabble.com. ___ grass-user mailing list grass-user@lists.osgeo.org http://lists.osgeo.org/mailman/listinfo/grass-user
Re: [GRASS-user] r.mapcalc concatenates values?
Hi Gabriele, After you use r.cross (I follow Christian´s suggestion on it), if you need to do some computation with the new generated raster map, you can use r.stats to generate a ascii output. After I even use R to haldle the tabular data. Cheers, miltinho astronauta brazil 2008/9/9 Christian Schwartze [EMAIL PROTECTED] If I unterstood you right, maybe r.cross is useful... Regards, Christian. Zitat von Gabriele N. [EMAIL PROTECTED]: Hi everyone. I have two questions 1) I have some raster (with the same format and are converted from vector). The cells have the value of CAT. So the value = CAT With r.mapcalc I would define a map of output that I give, as the value for each cell, indications of the different CAT. For example, if I have the raster A that has value = 1 and raster B that has value = 2, I will have raster C output value = 1,2 If I have 3 maps in input, value = 1,2,3 etc. ... I made several attempts but I do not know if r.mapcalc concatenates the values. 2) if r.mapcalc is not possible, I tried to make the transition to vector. The passages that I made are: - r.to.vect maps raster input (es rasterA and rasterB) - V.overlay and I get in dbf, in a column the value of rasterA and in another column the value of rasterB. I've created a third column to concatenate the 2 columns but it seems to me that the operator '| |' does not work with dbf. How do I concatenate the values in 2 columns? Thank you very much Gabriele -- View this message in context: http://www.nabble.com/r.mapcalc-concatenates-values--tp19392795p19392795.html Sent from the Grass - Users mailing list archive at Nabble.com. ___ grass-user mailing list grass-user@lists.osgeo.org http://lists.osgeo.org/mailman/listinfo/grass-user This mail was sent through http://webmail.uni-jena.de ___ grass-user mailing list grass-user@lists.osgeo.org http://lists.osgeo.org/mailman/listinfo/grass-user ___ grass-user mailing list grass-user@lists.osgeo.org http://lists.osgeo.org/mailman/listinfo/grass-user
