[GRASS-dev] v.external, ogr direct access, topology and pseudo-topology.... a bit confused

G. Allegri giohappy at gmail.com
Tue Apr 20 04:37:37 EDT 2010


Is it correct to say that pseudo-topology is at feature level, while
full-topology is at layer level?

2010/4/20 G. Allegri <giohappy at gmail.com>:
>> But even a simple overlay can give wrong results if the data is not
>> topologically clean... I personally cherish the fact that GRASS doesn't make
>> it easy to do things quick and dirty.
>
> Probably we mean different things, or maybe I've msunderstood topology
> in Grass. Spatial operators like Overlay generally leaverages on
> topology graph structures (like in GEOS), but I suppsed that
> pseudo-topology (as meant in Grass) would be enough to guarantee the
> results. Isn't it?
>


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