[Gdal-dev] optimum overview settings?

[Chapman, Martin]

Frank,

I will try.

Martin

-----Original Message-----
From: Frank Warmerdam [mailto:warmerdam at pobox.com] 
Sent: Friday, March 12, 2004 2:46 PM
To: gdal-dev at remotesensing.org
Subject: Re: [Gdal-dev] optimum overview settings?


Chapman, Martin wrote:
> The new pyramids just got added to the end of the file...so if you had

> an ovr file with 2, 4, 8, and you generated a new levels 2, 4, 8, 16 
> ... You would end up with a file of overviews like 2, 4, 8, 2, 4, 8, 
> 16.

Martin,

Hmm, that isn't supposed to happen.  I just tried this with a small file
and had no problem:

gdaladdo utm.tif 2 4
gdaladdo utm.tif 2 4
gdalinfo utm.tif
...
Band 1 Block=512x16 Type=Byte, ColorInterp=Gray
   Overviews: 256x256, 128x128

I also verified with tiffinfo that there were no extra overviews
created.

I then did a test with a .bt file that uses external overviews and
things seemed to work fine with it.

So, if you can reproduce the error you mention with 1.2.0 then please
report via bugzilla and I will look into it.

Best regards,
-- 
---------------------------------------+--------------------------------
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I set the clouds in motion - turn up   | Frank Warmerdam,
warmerdam at pobox.com
light and sound - activate the windows | http://pobox.com/~warmerdam
and watch the world go round - Rush    | Geospatial Programmer for Rent

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