On Wednesday 24 October 2007, [EMAIL PROTECTED] wrote: > hi, > On a contour map i want to plot two points A an B .The requirment is to > know if point A has a line of sight with point B. For this i started with > r.contour but this only gives me ontour of pheripheral i.e only the outline > and not the actual contour map with different heights. Now what i want from > you is firslty how shoulsd i produce first contour map and then find line > of sight. I hope you have now being clear with the subject and can help me > bec i really need yr help. Thanking you>
Again, please post these questions to the GRASS mailing list (see email headers...). Here is what I think you are trying to do: 1. determine line of sight (LOS) between points A and B in order to do this you need: 1. a DEM of the region 2. coordinates of A and B So: Do you have either contours to interpolate from, points to interpolate from, or a DEM? If so, then carefully read the manual page for r.los Cheers, Dylan > On Tuesday 23 October 2007, [EMAIL PROTECTED] wrote: > > > hi, > > > i am working for defence sector so for that i need to know line of > > > sight from a particular point. I am gonna used DGN map and hence i have > > > converted this into raster.Now line of sight is giving me a problem as > > > i am not able to find it. Can you solve my issue > > > > > You need to more clearly describe what you are doing, and post it to the > > GRASS-list. > > > > Dylan > > > > > 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 > > > > -- > > Dylan Beaudette > > Soil Resource Laboratory > > http://casoilresource.lawr.ucdavis.edu/ > > University of California at Davis > > 530.754.7341 -- 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