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

Filipe Silva Dias filipesdias at gmail.com
Tue Feb 28 06:41:04 EST 2012


I agree. For me it is a serious issue. When it comes to working with
rasters I have given up using QGIS.

On Tue, Feb 28, 2012 at 10:44 AM, Paolo Cavallini <cavallini at faunalia.it>wrote:

> 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
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