Does anyone has information on the progress of this ticket? From reading the comments on the the ticket, it looks as though there are some possibilities for enhancement.
I use rasters regularly so this issue comes quite often. For one particular 10GB DEM (in IMG format) it takes 7 or 8 minutes to calculate stats in QGIS, which takes a while when it happens every time I open that file. Stats have already been computed through gdalinfo. Thanks for any information. - John On Thu, Apr 14, 2011 at 7:24 AM, Radim Blazek <[email protected]>wrote: New ticket http://trac.osgeo.org/qgis/ticket/3735 > > Radim > > On Mon, Mar 21, 2011 at 4:37 PM, John Callahan <[email protected]> > 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 > > ************************************************** > > > > _______________________________________________ > > Qgis-user mailing list > > [email protected] > > http://lists.osgeo.org/mailman/listinfo/qgis-user > > > > >
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