>André wrote: >> I Have a vector layer with all the rivers, and >> subsidiaries up to the smallest water lines. >> However I need to simplify this layer in order that >> it only shows the main rivers and first, second and >> third order tributary water lines. >> >> Any hints on how to achieve this? > >try the v.strahler addon module: > >http://grass.osgeo.org/wiki/GRASS_AddOns#v.strahler
or try the very nice r.stream.*-suite http://grass.osgeo.org/wiki/GRASS_AddOns#r.stream.angle and following r.stream.angle r.stream.basins r.stream.del r.stream.distance r.stream.extract r.stream.order r.stream.pos r.stream.stats https://svn.osgeo.org/grass/grass-addons/grass6/raster/r.stream.order/description.html strahler Name of Strahler's stream order output map: see notes for detail. shreve Name of Shreve's stream magnitude output map: see notes for detail. horton Name of Horton's stream order output map (require accum file): see notes for detail. hack Name of Hack's main streams output map : see notes for detail. top Name of topological dimensions streams output map: see notes for detail. HTH Helmut ----- best regards Helmut -- View this message in context: http://osgeo-org.1560.n6.nabble.com/Hidrological-network-tp4351331p4351980.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