[Qgis-user] raster stats

[John Callahan]

I just downloaded the latest version of qgis-dev from OSGeo4W (1.9.90-Alpha
rev. f0f8a12) and it works great.  Thank you Tim.  Wonderful.

- John

***********************************************
John Callahan, Research Scientist
Delaware Geological Survey, University of Delaware
URL: http://www.dgs.udel.edu
*************************************************



On Sun, Nov 20, 2011 at 5:57 AM, Tim Sutton <lists at linfiniti.com> wrote:

> Hi
>
> On Sat, Nov 19, 2011 at 8:57 PM, John Callahan <john.callahan at udel.edu>
> wrote:
> > 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
> >
>
> This should no longer be an issue with recent changes I made. Please see:
>
> http://hub.qgis.org/issues/3735
>
> If you still get the issue, please let me know with detailed steps on
> how to replicate.
>
> Thanks
>
> Tim
>
>
> >
> >
> >
> > On Thu, Apr 14, 2011 at 7:24 AM, Radim Blazek <radim.blazek at gmail.com>
> > wrote:
> >>
> >> 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
> >> > **************************************************
> >> >
> >> > _______________________________________________
> >> > Qgis-user mailing list
> >> > Qgis-user at lists.osgeo.org
> >> > http://lists.osgeo.org/mailman/listinfo/qgis-user
> >> >
> >> >
> >
> >
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> >
> >
>
>
>
> --
> Tim Sutton - QGIS Project Steering Committee Member (Release  Manager)
> ==============================================
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