On Tue, Oct 2, 2012 at 12:49 PM, Moritz Lennert <[email protected]> wrote: > On 02/10/12 11:37, Margherita Di Leo wrote: >> >> >> >> On Tue, Oct 2, 2012 at 11:35 AM, Moritz Lennert >> <[email protected] <mailto:[email protected]>> >> wrote: >> >> On 01/10/12 10:10, Phil Donovan wrote: >> >> Kiaora GRASS! >> >> I require a network tool which can calculate 'service areas'. I >> know >> GRASS can currently do this but the specific problem I have is >> that I >> need to do it for a very large dataset (400,000 locations). I >> tried >> this with ArcGIS tool (sorry!) but it failed to 'solve' due to an >> overloaded memory. Would the GRASS tool 'v.net.iso' be able to >> process >> this without breaking? >> >> >> I don't have a straight answer to the question, but generally GRASS >> can handle fairly large datasets. It might depend more on the >> resources of your machine. >> >> The best way to find out would be to try. ;-) >> >> >> ..And please let us know :) > > > Yes ! :-) > > As a follow-up: you might want to try grass7 as AFAIR some improvements in > the modules only exist in that version for the moment. MarkusM can you > confirm that ?
v.net.iso itself has not changed much, but vector network analysis for large datasets (as other vector operations) should require much less memory in GRASS 7 because of substantial vector library changes. I have not tried network analysis with 400,000 locations myself (yet), but in theory the module would either bail out quickly with an out-of-memory error or happily crunch along. Markus M > > Moritz _______________________________________________ grass-user mailing list [email protected] http://lists.osgeo.org/mailman/listinfo/grass-user
