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

[Even Rouault]

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.

Ethan,

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 
dramatically.
"""

Best regards,

Even