Re[6]: [Qgis-developer] Re: [Qgis-user] Announcing RoadGraph plugin

Sergey Yakushev yakushevs at
Sat Jan 29 15:08:46 EST 2011

Fri, 28 Jan 2011 21:04:35 -0200 письмо от MaurМcio de Paulo < at>:

> What I meant for topology is that one can set a snapping tolerance different
> than the snapping tolerance.
> For instance, someone would like to snap with 100m so it's easier for the
> person to identify the features. But this same person has a pretty well
> constrained dataset and it should use topology tolerance of 1m. So sometimes
> it's a good thing that the topology tolerance and the snapping tolerance are
> not equal.
> For topology tolerance I mean the maximum distance between two points for
> the system to understand them as one point only.
> Usually it depends on the data's mapping scale.
> IMHO it would be desirable for roadgraph to use a tolerance for the
> endpoints also. This way users could work even with a dataset not so well
> built. What do you guys think?

+1. I agree. 

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