[GRASS-user] Topological Trouble
neteler at osgeo.org
Mon Sep 1 14:45:45 PDT 2014
On Thu, Aug 28, 2014 at 10:32 PM, James Keener <jim at jimkeener.com> wrote:
> 6.4.3 sorry about not including that from the start.
> On August 28, 2014 3:42:45 PM EDT, Markus Neteler <neteler at osgeo.org> wrote:
>> On Thu, Aug 28, 2014 at 1:40 PM, James Keener <jim at jimkeener.com> wrote:
>>> I'm trying to create a map with isolines for the road-distance places
>>> are from bus routes. I was trying to roughly follow
(nice tutorial, btw)
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:
>>> So, the first thing I did is import these files:
>>> Then I connect the stops to the network
>>>> v.net input=roads points=stops output=network operation=connect
Note that the threshold is specified in map units (so, here feet in your case).
Sidenote: in GRASS GIS 7 the module is a bit more advanced:
Perhaps (guessing, I didn't have time to test your data), the initial
threshold makes the difference?
More information about the grass-user