[Qgis-user] Slow to open huge rasters

[Radim Blazek]

On Thu, Jul 30, 2015 at 9:19 AM, Andrea Peri <aperi2007 at gmail.com> wrote:
> Hi,
>
> I have a GeoTiff raster of 24Gbyte, floating point (Float64) with 11
> bands and fomat geotiff.
>
> When try to open it with qgis 2.8.1 I see it take a really uge time to
> open it (about 10 hours).
> Initially I guess that was a time due to the huge dimension, but after
> the qgis show it.
> I notice that it is reallyquickly to zoom and pan.
> I don't understand why this difference between the open time and zoom/pan time.
>
> My first suspect was that qgis want to calculate the statistics in first open.
> But after a check with gdalinfo I see the statistics are available
> also in original tiff.

QGIS defaults are stretch to 2/98% cut, try to set in
Options > Rendering > Rasters
Contrast enhancement: No stretch  or  Limits: Minimum / maximum

Radim


> So I dont know really why it take so more time to open it.
>
> I hope to find some setting to reduce the pen time for this kind of images.
>
> Thx,
>
> A.
>
> --
> -----------------
> Andrea Peri
> . . . . . . . . .
> qwerty àèìòù
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