[gdal-dev] RE: GDAL JPEG2000 Problems

[Frank Warmerdam]

Bob Bruce wrote:
> I was having some problems with output JP2 images from GDAL and noticed that
> my version of FWTools was a bit old so today I downloaded and installed the
> latest version of FWTools. Immediately I noticed that the only JPEG2000
> output format left is the ECW one. What happened to the Kakadu and the
> JasPer formats that were previously in GDAL?

Bob,

I don't think I've ever distributed FWTools for windows with the JasPer
driver enabled.  I removed the Kakadu driver because after a review of the
Kakadu license terms I came to the conclusion that I might not be properly
operating within the limits of the license in distributing it as part of
FWTools.

FWTools *should* include the JP2MrSID driver as well, but I see that it is
normally read-only.

 > I understand that ECW has a
> conversion limit and this will be a concern for me as I try and make mosaics
> of blocks of photography.
> 
> So I went on to use the ECW JPEG2000 and ran into problems. I converted one
> of our 73Mb colour orthophotos (GeoTiff - we have 744 of them from our
> latest contract) to ECW JP2 and immediately noticed problems. In the output
> ECWJP2 file the entire 135m bottom of the image was replaced by bands of
> data 255m wide X 135m high that was taken 135m from the right side and 135
> up from the bottom. The entire right 135m of the image is replaced with a
> band taken starting 2X135m from the right and a further 135m to the right.
> The original GeoTiff appeared fine when viewed in QGIS, gvSIG and some
> proprietary GIS packages. QGIS showed these bands of data along the bottom
> and along the right side of the image.

This is an unexpected result. I'd offer to look more deeply into it, but
the ECW code is just a bear to work with, and on windows I'm using a fairly
old set of ECW code (and with some questionable hacking of my own involved).
I'm afraid of it!

I'm really not too sure where to go with this.

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    | President OSGeo, http://osgeo.org