Hi all, I'm trying to calculate drive time 'zones' using v.net.iso. I've worked through the examples using spearfish data, and seem to get suitable results using only the line 'distance' as the factor. However, I'd like to include the speed limit as another factor in the calculation, and can't seem to find any examples of how to do this.
I've looked through the examples here: http://grass.itc.it/grass64/manuals/html64_user/v.net.iso.html and here: http://www.dinama.gub.uy/grass/grass57/tutorial/network.html (which mentions "This calculates the reachability map based on the vector length for 1km, 2.5km, 5km and 10km. Another option were to use vector line attributes from a DBMS table which may contain velocity, street types etc." - so it appears to be possible! Can anyone point out what I'm missing, and/or the appropriate command or switch? Cheers, Darren Cope http://dmcope.freeshell.org http://bluesignweekly.blogspot.com/ _______________________________________________ grass-user mailing list [email protected] http://lists.osgeo.org/mailman/listinfo/grass-user
