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

[Moritz Lennert]

On 20/04/10 09:45, G. Allegri wrote:
>> Yes, but the fundamental question here is: should the speed of these
>> operations be more important then their quality ?
>
> The quality is always important. I think the question is: is topology
> always required to guarantee it? The answer, IMHO, is no. In that
> cases the quality doesn't depend on the data structure or the
> algorithm, but on the input data. The algorithm shouldn't alter the
> intrinsic quality of the information... This, of course, depends on
> what you're doing. A network analysis should never let be done on
> non-topo data! :)

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.

Moritz