Dear Richard and all > Yasuo - > > For length: > v.to.db map=line_db option=length units=k column=length > > This would put the length of the line into the column, in kilometers. If > you want some other unit, check v.to.db --help to choose the right > parameter.
Thank you for useful adivece! I also saw grass 6.4 manual and found it. http://grass.osgeo.org/gdp/html_grass64/v.to.db.html Upload line lengths (in meters) of each vector line to attribute table (use v. category in case of missing categories): v.to.db map=roads option=length type=line col=linelength units=me > I don't know how to check the node count - someone else may help there. ....please give me some information about it... Best Yasuo shimada ( JWA ) --- sgw00...@nifty.com wrote: > Hi grass users; > > We traced bird migration by marine radar. > > By using graphic analyze of radar monitor capture on PC, we had many line > vectors of bird flight. > > I would like to add new columns of the number of node and lenght of line vector, > > > So; > > v.db.addcol line_db columns="num_node int" > v.db.addcol line_db columns="length double precision" > > After that, to update and fill two columus, what commands do I use ? > > I think...can I use SQL query with spatilite...is it right ? > > Best > > Yasuo shimada ( Japan Weather Association ) _______________________________________________ grass-user mailing list grass-user@lists.osgeo.org http://lists.osgeo.org/mailman/listinfo/grass-user