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

[G. Allegri]

PS: the projections is EPSG:3003 (or 102091). The OTFR is disabled.

giovanni


2012/8/21 G. Allegri <giohappy at gmail.com>

> 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
>> >> >
>> >
>> >
>>
>
>
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