[gdal-dev] Does SetSpatialFilter use spatial indexes (.qix) for shapefiles

Even Rouault even.rouault at mines-paris.org
Mon Nov 14 13:23:06 EST 2011

Le lundi 14 novembre 2011 18:17:38, Ethan Alpert a écrit :
> Curious if the Shapefile driver uses .qix files if they're available
> when performing SetSpatialFitler.


Quoting http://gdal.org/ogr/drv_shapefile.html :

The spatial indexing uses the same .qix quadtree spatial index files that are 
used by UMN MapServer. [...]. Spatial indexing can accelerate spatially 
filtered passes through large datasets to pick out a small area quite 

Best regards,


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