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

[Stefan Keller]

Hoi Stefan

No it doesn'nt need to be gauss resampling method.
We found that GeoTIFF with overview index performs fastest.

Yours, S.

2014-10-13 15:22 GMT+02:00 Ziegler Stefan <Stefan.Ziegler at bd.so.ch>:
> 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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