[postgis-users] Checking Road Network Topology
toni at sigte.udg.edu
Fri Jan 23 04:04:05 PST 2015
yeah! that's it.
On 23/01/2015 11:34, Sandro Santilli wrote:
> On Fri, Jan 23, 2015 at 10:46:43AM +0100, toni hernández wrote:
>> At this point I am not sure. :-(
>> I tried again using srid=4326 and a tolerance of 0.0001 which for my
>> latitud (Girona, Spain) is about 1 meter.
>> This time everything worked just fine.
> So, to recap, tolerance=0 errored out while tolerance=0.0001 worked fine ?
> Note that when a tolerance=0 is given, the code would actually compute
> the tolerance for each line geometry added looking at the smallest
> representable shift from the biggest ordinate value in input.
> There are known robustness issues in the topology builder which you can
> find on the tracker. You might have encountered one of these. The idea
> to load in chunks serves the purpose to be able to fix such issues locally
> when they happen, understanding your data better and tweaking tolerances
> on a feature basis (if needed).
> () Free GIS & Flash consultant/developer
> /\ http://strk.keybit.net/services.html
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