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

[Jonathan Moules]

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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