[gdal-dev] gdaladdo creates very large files in 1.8 but not trunk

[Eli Adam]

> I'm not aware of any recent change in the GTiff driver that could have 
> "solved" 
> the issue you've seen. This is a bit surprising.
> 
> Could you also try with the -stable builds (based on 1.8 branch) from 
> http://vbkto.dyndns.org/sdk/ to compare ?

I am trying it with, http://vbkto.dyndns.org/sdk/PackageList.aspx?file=release-1500-gdal-1-8-mapserver-5-6.zip 

Although not finished, based on progress so far, it looks to be working properly and on track to create a 3G ovr.  That is consistent with trunk.  I'll provide more information when it finishes.  

Eli


> 
>> This is an informational report only, there are not problems in trunk.
>> 
>> Using 1.8.0 from OSGeo4W on XP, I made a mosaic of about 1200 uncompressed
>> tifs totally 80G.
>> 
>> gdalbuildvrt mosaic.vrt *.tif
>> 
>> Then gdal_translated that to a compressed tif of about 8G
>> 
>> gdal_translate mosaic.vrt mosaic_ycbcr_big.tif -co COMPRESS=JPEG -co
>> PHOTOMETRIC=YCBCR -co TILED=YES -co BIGTIFF=YES --config GDAL_CACHEMAX 800
>> 
>> Last step was to add some overviews:
>> 
>> gdaladdo --config COMPRESS_OVERVIEW JPEG --config PHOTOMETRIC_OVERVIEW
>> YCBCR --config INTERLEAVE_OVERVIEW PIXEL --config BIGTIFF_OVERVIEW YES
>> --config GDAL_CACHEMAX 800 -r average -ro mosaic_ycbcr_big.tif 2 4 8 16 32
>> 64 128
>> 
>> It works (at least in OpenEV it displays quickly like it is using
>> overviews), except the file sizes for the overviews seem odd and too
>> large.
>> 
>> The tiles are about 80G, the result of gdal_translate is 8G, the result of
>> gdaladdo, mosaic_ycbcr_big.tif.ovr,  is 375G!  That was using 1.8.0.
>> 
>> I tested on trunk on ubuntu and XP from here, http://vbkto.dyndns.org/sdk/ 
>> which produce reasonable results.  The ovr is about 3G.
>> 
>> A dif of gdalinfo on the .tif and .ovr are the same.
>> 
>> (I hope that is not the result of a typo when I initially typed the
>> command.  I unfortunately don't have the shell around any more but took
>> the above listed commands from some notes I took.)
>> 
>> I have tried making the overviews internal and external with similar
>> results.  I also tried making the overviews on the uncompressed files (the
>> vrt) with the same results.  Then I made the overviews 1 level at a time
>> and those results seemed reasonable.
>> 
>> I didn't find any tickets about this in trac, but don't experience this in
>> trunk so apparently it is fixed.  Just reporting in case it is useful.
>> 
>> Do you want any other information?
>> 
>> Thanks, Eli
>> 
>> 
>> 
>> 
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