[postgis-users] topology overlapping of edges

[Mario Jurcevic]

Hi,
the cadastre data ( Suisse ) are full of this overlaps, It happens when 
they introduce arc curves ( specially with streets ),
i suppose due to inaccuracy of the computation of  the arc points or for 
historically reason ( digitizing errors ) or simply
because is cheaper to measure.

Attached the image of the overlap.


In addition I have some more questions:

Will topology support edge with arcs and not only linestrings?

I try to insert into an empty topology geometries with functions 
TopoGeo_AddLineString, addEdge, addIsoEdge and is incredibly slow,
it was only a small subset of data ( 20'000 lines ) and  after waiting 
10 minutes I dropped out, why is so slow  or maybe there is another way
to insert data?

Thanks

Mario Jurcevic



--
http://www.soft-gis.com




On 09/27/2012 08:00 AM, Christophe Vergon wrote:
> Hi,
>
> "cadastre" data means that you're french ?
>
> I do the same, importing french survey data in postgis 2.0 with topology.
>
> I think that you're not in the right way. Have a look at 
> topogeo_addpolygon function with tolerance=0.
> It's a better way to fix french survey data topology troubles.
>
>
>
> Mario Jurcevic a écrit :
>> Hello,
>> I am testing postgis topology with cadastre data, overlapping of 
>> edges with given tolerance is allowed.
>> How to handle this kind of data: insert,modify,etc?
>> Is possible to temporary disable the validation and  or implement a 
>> custom validation?
>>
>> Thanks in advance
>>
>> Mario Jurcevic
>>
>>
>> _______________________________________________
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>> postgis-users at postgis.refractions.net
>> http://postgis.refractions.net/mailman/listinfo/postgis-users
>>
>>
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