Le Fri, 16 Oct 2015 18:38:28 +0200, Etienne DELAY <[email protected]> a écrit :
> Dear all, > I'm try to understand network analysis fonction in grass 6.4. I have > 2 layers : > * Points layer with the spatial dams repartition > * polylines layer with rivers > I would like to know for each dam how is before and how is after in > the network. I at the end I would like to export a shp files with > those data in the attribute table. > > I have find some informations here : > http://www.ing.unitn.it/~grass/docs/tutorial_641_en/htdocs/esercitazione/network_analysis/node1.html > > And I have done that : > > ##save a region > v.in.region --overwrite --verbose output=region_central > > ## clip rivers > v.overlay --overwrite --verbose ainput=troncon_dordogne@PERMANENT > atype=line binput=region_central output=rivers_central operator=and > > v.overlay --overwrite --verbose ainput=troncon_dordogne@PERMANENT > atype=line binput=bv_dordogne@PERMANENT output=rivers_bv operator=and > v.select ainput=barrage_energie@PERMANENT > binput=bv_dordogne@PERMANENT output=barrage_e_bv > ##Connect dam points to the network > ## thresh=500 means that only points within > ## the distance of 500 metres are connected to the lines > v.net --overwrite --verbose input=rivers_bv > points=barrage_e_bv@PERMANENT output=network operation=connect > thresh=500 > > ## link the attribute table of the fire stations to layer 2 of the > network map > v.db.connect -o --verbose map=network table=barrage_e_bv@PERMANENT > layer=2 > > But I'm not so smart with data manipulation in GRASS so If someone > can give me a hand it's nice :-) What is your actual question, i.e. with what do you need help ? Also note that network modules have been significantly improved in GRASS 7, so you should consider updating to that. Moritz _______________________________________________ grass-user mailing list [email protected] http://lists.osgeo.org/mailman/listinfo/grass-user
