[Qgis-developer] Loading raster stats: grass/gdal slowdown?

Paolo Cavallini cavallini at faunalia.it
Tue Feb 28 05:44:46 EST 2012


Hi all.
Loading a raster is in certain conditions unacceptably slow, and as we have seen this
is largely due to stats collections. At least for GRASS rasters, gdal knows he cannot
compute stats; e.g. in R:

Geospatial Data Abstraction Library extensions to R successfully loaded
Loaded GDAL runtime: GDAL 1.8.1, released 2011/07/09
Path to GDAL shared files: /usr/share/gdal/1.8
Loaded PROJ.4 runtime: Rel. 4.7.1, 23 September 2009, [PJ_VERSION: 470]
Path to PROJ.4 shared files: (autodetected)
Warning message:
statistics not supported by this driver

Is it possible that QGIS is trying to calculate stats, and this is a reason for the
slowdown?
All the best.
-- 
Paolo Cavallini - Faunalia
www.faunalia.eu
Full contact details at www.faunalia.eu/pc


More information about the Qgis-developer mailing list