On Tuesday 23 October 2007, [EMAIL PROTECTED] wrote: > hi, > I am working on grass 6.2 with a dgn map. > now i have converted this map into raster for finding line of sight.using > v.to.r now i used r.los in=DGN_rast out=rast_los coor=x,y > this give me output from the given point in 360degree > but i want to find line of sight between only two points. > you said use mapcalc for creating a patt_map file > Now mapcalc says > r.mapcalc pat_map= "if(where you want,1 0)" > eg : r.mapcalc pat_map= "if(road<5,1, 0) > Here this "5"resembels category value ,now when i sain r.report my DGN_rast > map have 63 cat value but it dose not give me any description saying what > dose this cat value resembles......so help me with proper syntax and format > Now can you tell me how should i fill up this syntax with this issue(los) > in mind. And ya after this pat_map file is created then am i suppose to use > r.los again and then how will i b able to see i.e will it be showing twom > points and a green line or something else? Someone plz try and help me i am > struggling for this since long .
Can you describe the task which you are trying to solve with GRASS ? Dylan -- Dylan Beaudette Soil Resource Laboratory http://casoilresource.lawr.ucdavis.edu/ University of California at Davis 530.754.7341 _______________________________________________ grassuser mailing list grassuser@grass.itc.it http://grass.itc.it/mailman/listinfo/grassuser