Dear all, I am interested in extracting the longest -1,000 meter contour from a bathymetric DEM and to save it in a text file as points.
By doing: r.contour in=my_dem out=contour levels=-1000 v.to.points in=contour out=contour_points dmax=my_resolution v.out.ascii in=contour_points out=contour_points.txt fs=" " dp=4 ... I get a text file with the contour points, however, it includes many different isolated contours, all with the same category (1). Since I need only the longest, I believe I need to separate the different contours, maybe assigning different categories somehow, then maybe updating the database with v.to.db using option=length and then v.db.select the longest contour. But I am not very used to working with vectors, so I don't know if that's the correct approach (nor how to accomplish it), so I would appreciate very much any help. Many thanks. Marcello. -- View this message in context: http://osgeo-org.1803224.n2.nabble.com/How-to-extract-one-single-contour-tp6639491p6639491.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