[postgis-users] curves geometries and topology

[Rémi Cura]

The problem is going to be precision.

If this is important for you you may want to switch to cgal which support
arbitrary curve in arrangment (from memory)

If precision is not important, you can easily add an uggly fix : add 2
triggers to edge table that
_when something want to access an edge, convert it to linestring
_when something want to write an edge, convert it to your curve model

Cheers,
Rémi-C


2014-04-14 17:10 GMT+02:00 Eric Ladner <eric.ladner at gmail.com>:

> As long as they are simple circles, you should be able to convert back and
> forth between curves and lines.  Splines, beziers, et al, are probably not
> going to work at all and would need to be approximated as lines.
>
> http://boundlessgeo.com/2012/01/getting-curvey/
>
>
> On Mon, Apr 14, 2014 at 8:02 AM, Reijer Copier <Reijer.Copier at idgis.nl>wrote:
>
>> Dear list,
>>
>> According to the documentation, PostGIS Topology only supports edges made
>> out of linestrings. However, we are currently working on a dataset that
>> contains lots of curved geometries. It would be great if we could build
>> topology based on those curved geometries without having to convert them to
>> linestrings first. Is this possible? If not, what is the best way to deal
>> with this situation?
>>
>> --
>>
>> Kind regards,
>>
>> Reijer Copier
>> IDgis bv
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>>
>
>
>
> --
> Eric Ladner
>
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