[gdal-dev] Bad design in -clipsrs?

[Rahkonen Jukka (MML)]

And probably with -spat the spatial index is only used for discarding features which are outside the area of interest but not for analyzing if they are candidates for clipping or not. With complicated features it might be good to compare first if the boundary of clipping polygon crosses the bbox of a feature - no cross - for sure no need to clip.

-Jukka-
________________________________
Lähettäjä: Even Rouault<mailto:even.rouault at spatialys.com>
Lähetetty: ‎25.‎10.‎2015 12:02
Vastaanottaja: gdal-dev at lists.osgeo.org<mailto:gdal-dev at lists.osgeo.org>
Kopio: Rahkonen Jukka (MML)<mailto:jukka.rahkonen at maanmittauslaitos.fi>
Aihe: Re: [gdal-dev] Bad design in -clipsrs?

Le dimanche 25 octobre 2015 10:42:21, Jukka Rahkonen a écrit :
> Hi,
>
> I wonder if this gis.stackexchange question
> http://gis.stackexchange.com/questions/167584/clipping-vs-intersecting
> could indicate that GDAL is doing clipping in a sub-optimal way, perhaps
> without utilizing spatial index

Yes, it doesn't use spatial index if you don't specify one explictly with -
spat. Was discussed recently I believe.
Could/should be improved. Patch welcome if someone wants to have a try.

> or something like that. ArcGIS and
> OpenJUMP are claimed to clip linestrings 100 times faster than GDAL.
>
> -Jukka Rahkonen-
>
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