[Qgis-user] 32bit gdal gdal modules

[Even Rouault]

Le mercredi 20 mai 2015 16:54:53, Nicolas Cadieux a écrit :
> Hi,
> The problem with gdal_merge seems to be with the input parameters I used to
> deflate the file. Locks at 4GB file size. Cheers

You may need to explcitely add -co BIGTIFF=YES when generating compressed TIFF 
that will be larger than 4GB. The GeoTIFF driver has a heuristics to determine 
if a bigtiff file must be generated or not, but it's not bullet-proof. In recent 
versions (GDAL 1.11 and above likely) you should get an error message "Maximum 
TIFF file size exceeded. Use BIGTIFF=YES creation option."

> Nicolas Cadieux M.Sc.
> Les Entreprises Archéotec inc. 
> 8548, rue Saint-Denis Montréal H2P 2H2
> Téléphone: 514.381.5112  Fax: 514.381.4995
> www.archeotec.ca
> On May 19, 2015 12:01, "Even Rouault-2 [via OSGeo.org]	"
> <ml-node+s1560n5206474h55 at n6.nabble.com> wrote:
> 
> 	Le mardi 19 mai 2015 17:58:33, [hidden email]  a écrit :
> > Hi,
> > It seems that both gdal_contour and gdal_merge in QGIS 2.6 and 2.8
> (both > 64bit windows installs on Windows 7_64) are still in 32 bit.
> Both stop > when output files hit 4 194 304KB (.tiff or .shp) Is there
> a way around > those limitations?
> 32 or 64-bit builds should have no influence on the limitation of output
> files. A 32-bit build can certainly handle files > 4 GB.
> .shp are limited to 2GB due to the format anyway.
> .tif might be limited to 4 GB with libtiff 3, but are no longer limited
> with libtiff 4 with BIGTIFF enabled.
> > Thanks
> > Nicolas
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