Jonathan
Thanks for asking. See below the output of gdalinfo.
Yours, S.
>gdalinfo zh.tif
Driver: GTiff/GeoTIFF
Files: zh.tif
Size is 152498, 190232
Coordinate System is:
PROJCS["CH1903 / LV03",
GEOGCS["CH1903",
DATUM["CH1903",
SPHEROID["Bessel 1841",6377397.155,299.1528128000009,
AUTHORITY["EPSG","7004"]],
TOWGS84[674.4,15.1,405.3,0,0,0,0],
AUTHORITY["EPSG","6149"]],
PRIMEM["Greenwich",0],
UNIT["degree",0.0174532925199433],
AUTHORITY["EPSG","4149"]],
PROJECTION["Hotine_Oblique_Mercator"],
PARAMETER["latitude_of_center",46.95240555555556],
PARAMETER["longitude_of_center",7.439583333333333],
PARAMETER["azimuth",90],
PARAMETER["rectified_grid_angle",90],
PARAMETER["scale_factor",1],
PARAMETER["false_easting",600000],
PARAMETER["false_northing",200000],
UNIT["metre",1,
AUTHORITY["EPSG","9001"]],
AUTHORITY["EPSG","21781"]]
Origin = (669243.920000001790000,283343.191250000090000)
Pixel Size = (0.312500368857287,-0.312499428329607)
Metadata:
AREA_OR_POINT=Area
Image Structure Metadata:
COMPRESSION=LZW
INTERLEAVE=BAND
Corner Coordinates:
Upper Left ( 669243.920, 283343.191) ( 8d21'43.79"E, 47d41'54.41"N)
Lower Left ( 669243.920, 223895.800) ( 8d21'10.57"E, 47d 9'49.48"N)
Upper Right ( 716899.601, 283343.191) ( 8d59'49.11"E, 47d41'30.00"N)
Lower Right ( 716899.601, 223895.800) ( 8d58'53.05"E, 47d 9'25.32"N)
Center ( 693071.761, 253619.496) ( 8d40'24.09"E, 47d25'41.40"N)
Band 1 Block=152498x1 Type=Byte, ColorInterp=Gray
Min=1.000 Max=255.000
Minimum=1.000, Maximum=255.000, Mean=231.759, StdDev=73.234
NoData Value=0
Overviews: 76249x95116, 38125x47558, 19063x23779, 9532x11890, 4766x5945, 2383x
2973, 1192x1487
Metadata:
STATISTICS_MAXIMUM=255
STATISTICS_MEAN=231.75856617323
STATISTICS_MINIMUM=1
STATISTICS_STDDEV=73.233598475527
2014-10-13 15:05 GMT+02:00 Jonathan Moules <[email protected]>:
> 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: [email protected]
> [mailto:[email protected]] On Behalf Of Stefan Keller
> Sent: Sunday, October 12, 2014 1:34 PM
> To: [email protected]; 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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