Hi Jitu, a way would be to convert the lines to raster (v.to.rast) and calculate the statistics (r.stats).
As every line has a unique id, the "raster-lines" will have. Hope it helps, Achim Jitendra Kumar schrieb: > Hi, > "v.what.rast" allows to extract the values from the raster at the vector > points. How to do a similar operation for a vector map consisting of > lines instead of points. I have road network as vector and I wish to > extract the average value over each line segment from a raster. > > I thought of several options but had one or other conceptual problem. I > can convert the vector line to points using "v.to.points" and extract > the values at each point using "v.what.rast". But I am not sure how to > identify the points lying on a particular line in order calculate the > average over the line. > I do want to preserve the lines in my road network vector data since it > gets used in some other network analysis as well. > > If I have several attributes associated with my raster, how to specify > the attribute to be extracted to "v.what.rast" ? > > I am quite confused as to how to do this. Any pointers would be of great > help? > > Thanks, > Jitu > > > ------------------------------------------------------------------------ > > _______________________________________________ > grass-user mailing list > [email protected] > http://lists.osgeo.org/mailman/listinfo/grass-user _______________________________________________ grass-user mailing list [email protected] http://lists.osgeo.org/mailman/listinfo/grass-user
