[Qgis-user] singelband pseudocolor takes a very long time to classify a 21698x24647 raster

[G. Allegri]

Driver: AIG/Arc/Info Binary Grid
Hi Etienne,
I past the gdalinfo output below.

giovanni


Size is 21698, 24647
Coordinate System is:
PROJCS["unnamed",
    GEOGCS["Unknown datum based upon the International 1924 ellipsoid",
        DATUM["Not_specified_based_on_International_1924_ellipsoid",
            SPHEROID["International 1924",6378388,297,
                AUTHORITY["EPSG","7022"]],
            AUTHORITY["EPSG","6022"]],
        PRIMEM["Greenwich",0,
            AUTHORITY["EPSG","8901"]],
        UNIT["degree",0.0174532925199433,
            AUTHORITY["EPSG","9122"]],
        AUTHORITY["EPSG","4022"]],
    PROJECTION["Transverse_Mercator"],
    PARAMETER["latitude_of_origin",0],
    PARAMETER["central_meridian",9],
    PARAMETER["scale_factor",0.9996],
    PARAMETER["false_easting",1500000],
    PARAMETER["false_northing",0],
    UNIT["METERS",1]]
Origin = (1554747.231034494200000,4924790.769999999600000)
Pixel Size = (10.000000000000000,-10.000000000000000)
Corner Coordinates:
Upper Left  ( 1554747.231, 4924790.770) (  9d41'17.95"E, 44d28'24.73"N)
Lower Left  ( 1554747.231, 4678320.770) (  9d39'49.23"E, 42d15'15.90"N)
Upper Right ( 1771727.231, 4924790.770) ( 12d24'48.42"E, 44d25'28.46"N)
Lower Right ( 1771727.231, 4678320.770) ( 12d17'29.40"E, 42d12'32.70"N)
Center      ( 1663237.231, 4801555.770) ( 11d 0'50.41"E, 43d20'54.04"N)
Band 1 Block=256x4 Type=Float32, ColorInterp=Undefined
  Min=-5.300 Max=2051.936
  NoData Value=-3.4028234663852886e+038

2012/8/20 Etienne Tourigny <etourigny.dev at gmail.com>

> On Mon, Aug 20, 2012 at 11:52 AM, G. Allegri <giohappy at gmail.com> wrote:
> > Hi Etienne,
> >
> >> which ramp(s) are you using, and how many classification steps?
> >
> >
> > any ramp (qgis defaults and cpt-city behave the same)
> >
> >>
> >>
> >> Can you test in linux?
> >
> >
> > I will do as soon as I restore my Ubuntu VM...
> >
> >>
> >>
> >> Can you make the file available?
> >
> >
> > Mmm, I suppose no, both for license issues and being a huge file (various
> > GBs).
> > I will try with a subset.
>
> Hi, I can understand that.  Just to have an idea, can you post
> gdalinfo output or at least give some specifics so I can make a
> similar file (i.e. resolution, type, range)
>
> Etienne
> >
> > giovanni
> >
> >
> >
> >
> >>
> >>
> >> Etienne
> >>
> >> On Mon, Aug 20, 2012 at 7:50 AM, G. Allegri <giohappy at gmail.com> wrote:
> >> > I'm testing the new raster styling with qgis-dev (from osgeo4w) on a
> >> > Windows
> >> > 7 64bit machine.
> >> > My single band raster (21698x24647) takes a very long time to do the
> >> > color
> >> > ramp classification with singleband pseudocolor. So much time that I
> >> > ended
> >> > it before completion (minutes after starting it).
> >> > In QGis 1.8 the (not customizable) Pseudo Color option rendered
> >> > istantaneously.
> >> >
> >> > The new features in raster simbology are really awesome!
> >> > Thanks a lot,
> >> > giovanni
> >> >
> >> >
> >> > _______________________________________________
> >> > Qgis-user mailing list
> >> > Qgis-user at lists.osgeo.org
> >> > http://lists.osgeo.org/mailman/listinfo/qgis-user
> >> >
> >
> >
>
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://lists.osgeo.org/pipermail/qgis-user/attachments/20120821/73fa5f64/attachment.html>