[Qgis-user] raster stats

[Radim Blazek]

New ticket http://trac.osgeo.org/qgis/ticket/3735

Radim

On Mon, Mar 21, 2011 at 4:37 PM, John Callahan <john.callahan at udel.edu> wrote:
> I'm not sure if this behavior is expected or I am missing something.
>
> I have a 1 band raster dataset (an elevation DEM) in TIF format.  It has
> statistics computed from "gdalinfo -stats mydata.tif"   However, when I open
> it in QGIS (both 1.6 and 1.7 trunk), and look at the Metadata tab in Layer
> properties, there are two sections that contain band stats information.  The
> first section is labeled "Band 1" and lists the same stats as found using
> gdalinfo.  The second section is labeled "Band" and says "No stats collected
> yet" for band 1.  QGIS has to create the stats when I apply a color map or
> stretch.  For large rasters, this takes a while, and must be done each time
> it's used in QGIS.
>
> Has anyone experienced this behavior?  Is this expected?  Is there a way to
> let gdal compute all the stats that QGIS needs?  Thanks.
>
> - John
>
> **************************************************
> John Callahan, Research Scientist
> Delaware Geological Survey, University of Delaware
> URL: http://www.dgs.udel.edu
> **************************************************
>
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