[GRASS-dev] about simple feature/ogr direct processing

[G. Allegri]

Update, v.external uses pseudo-topology, while OGR direct access uses
true topology... mmm, so I think that the v.external way could be the
right one to develop SF algorithms....

giovanni



> 1 - v.external links to data without topology buing built. At the
> moment it's only useful for visualizing (but could it be used for SF
> algorithms?)
> 2 - OGR data sources use "pseudo-topology". Does this refer to the
> read/write directly accessed sources? Or is it general? What is the
> main difference between pseudo- and real- topology?
>
> thanks again,
> giovanni
>
>
>
> 2010/4/6 Martin Landa <landa.martin at gmail.com>:
>> [back to ML]
>>
>> Hi,
>>
>> 2010/4/6 G. Allegri <giohappy at gmail.com>:
>>> So it's not meant to be used for ogc simple featurer processing (like
>>> in qgis or saga). The topo build step is required for processing. I
>>> thought it was an option to permit the development/use of
>>> not-topological algorithms...
>>
>> it's question for discussion, currently no SF processing implemented
>> in GRASS AFAIK.
>>
>> Martin
>>
>> --
>> Martin Landa <landa.martin gmail.com> * http://gama.fsv.cvut.cz/~landa
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>