Thanks for replying Markus, > > Note that their projection is in meters, while... > >>>> I am using the following shapefiles in SRID 2272 (NAD83 / Pennsylvania >>>> South (ftUS)): > > ... your's is in US feet (http://epsg.io/2272). > This affect the threshold you use below: >
I know. For testing purposes it seemed to be reasonable, though (increments of 1000 ft. For my final map I'll probably do 1/4mi, 1/2mi, 3/4mi, and 1mi increments). >>>>> v.net input=roads points=stops output=network operation=connect >>>>> thresh=500 > > Note that the threshold is specified in map units (so, here feet in your > case). > I spot checked a lot of the bus stops, and they appeared to be connected to the road graph. FWIW. The TIGER road maps do appear to make intersections overlap, but don't put a point that all the adjoining roads connect to. (This brings up something I was going to worry about later: bridges vs intersections?) > Sidenote: in GRASS GIS 7 the module is a bit more advanced: > http://grass.osgeo.org/grass70/manuals/v.net.html > > Perhaps (guessing, I didn't have time to test your data), the initial > threshold makes the difference? > I'll have to give GRASS 7 a shot:) (GRASS 6 is what was in the repo I was using). I'm completely new at this so the biggest problem for me is not know exactly where to look when something isn't working. Thanks again for your input! Jim
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