[Qgis-user] Generating GeoTIFF overview ("gdaladdo -r gauss ...") takes days for 2GB file...

[Ziegler Stefan]

Hi Stefan

Does it need to be "gauss" as resampling method? You can use QGIS' own resampling functionality to get nice raster rendering. 

Regards
Stefan 

> -----Ursprüngliche Nachricht-----
> Von: qgis-user-bounces at lists.osgeo.org [mailto:qgis-user-bounces at lists.osgeo.org] Im
> Auftrag von Jonathan Moules
> Gesendet: Montag, 13. Oktober 2014 15:05
> An: 'Stefan Keller'; 'gdal-dev at lists.osgeo.org'; 'qgis-user'
> Betreff: Re: [Qgis-user] Generating GeoTIFF overview ("gdaladdo -r gauss ...") takes
> days for 2GB file...
> 
> Hi Stefan,
> How large is the image? As in, pixel width & height.
> 
> Also the GDALinfo would be helpful.
> 
> 7 days is a very long time. I've seen times like that myself for images that were
> 100,000*50,000 or similar dimensions where there was (still is?) an issue with the
> pyramiding function in GDAL (it was re-reading the data again and again).
> 
> Cheers,
> Jonathan
> 
> -----Original Message-----
> From: qgis-user-bounces at lists.osgeo.org [mailto:qgis-user-bounces at lists.osgeo.org]
> On Behalf Of Stefan Keller
> Sent: Sunday, October 12, 2014 1:34 PM
> To: gdal-dev at lists.osgeo.org; qgis-user
> Subject: [Qgis-user] Generating GeoTIFF overview ("gdaladdo -r gauss ...") takes days
> for 2GB file...
> 
> Hi,
> 
> I have a GeoTIFF file of 2GB size. Now, this question is about gdaladdo and how to
> optimize loading time of such a large raster file.
> 
> According to my observations QGIS has fastest loading times when it's a single
> GeoTIFF file with overview images.
> 
> Q.1: Does anybody have tipps for even faster solutions loading raster files into in QGIS
> (prepared by OGR or other preprocessors)?
> 
> The command "gdaladdo -r gauss C:\SG.tif  2 4 8 16 32 64 128 256"
> takes actually about 7 days on a Lenovo notebook.
> 
> Q2.: Any hint's on how to accelerate this (or to other tools generating
> overviews/pyramids)?
> 
> Yours, S.
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