[postgis-users] Using PostGIS topology to clean-up network prior to routing

[Adrien ANDRÉ]

Thank you, updating PostGIS to 2.2.0dev solved the "shell must be
closed" errors.

Now "faces mismatch" are dominant :

 123 faces mismatch: invalid topology ?
  22 SQL/MM Spatial exception - geometry crosses edge
   2 Edge changed disposition around end node
   1 SQL/MM Spatial exception - geometry crosses a node
   1 Spatial exception - geometry intersects edge
   1 Edge changed disposition around start node


How do i understand them ?


Regards,

Adrien


Le 03/07/2014 10:19, Sandro Santilli a écrit :
> On Thu, Jul 03, 2014 at 09:24:05AM -0300, Adrien ANDRÉ wrote:
> 
>> But for some linestrings, the toTopoGeom function [2] outputs errors.
>> Here is a list with counts:
>>
>>  458 lwpoly_from_lwlines: shell must be closed
>>   41 faces mismatch: invalid topology ?
>>   30 SQL/MM Spatial exception - geometry crosses edge
>>    8 query string argument of EXECUTE is null
>>
>> So the "shell must be closed" is the main one.
>>
>> All linestrings are valid (ST_IsValid says).
>>
>> Would you know why this happens?
>> How may i debug this?
> 
> First of all you should make sure to be running the latest development
> version of PostGIS Topology, then you would need to reduce the dataset
> as much as possibly without loosing the "lwpoly_from_lwlines" error.
> 
> The "shell must be closed" error should not come out anymore during
> toTopoGeom as recent versions. It comes from an failed attempt to convert
> a polygon to GEOS format, for some topological operation. We should not
> be doing that since we moved to the edge-walking algorithm:
> http://strk.keybit.net/blog/2012/01/28/a-walk-on-the-wild-side/
> 
> --strk;
> _______________________________________________
> postgis-users mailing list
> postgis-users at lists.osgeo.org
> http://lists.osgeo.org/cgi-bin/mailman/listinfo/postgis-users
> 
-------------- next part --------------
A non-text attachment was scrubbed...
Name: adrien_andre.vcf
Type: text/x-vcard
Size: 432 bytes
Desc: not available
URL: <http://lists.osgeo.org/pipermail/postgis-users/attachments/20140707/cf240779/attachment.vcf>