[Geoserver-users] geotiff compression with predictor

Andrea Aime

2017-05-25 16:07:30 UTC

The GDAL GeoTIFF reader has been explicitly removed from the
GDAL extension package as it kept on causing problems (but I don't remember
the details of what was happening, sorry!).

Cheers
Andrea

On Thu, May 25, 2017 at 5:53 PM, Rahkonen Jukka (MML) <

Hi,
I wonder if it woud work with the imageio-ext GDAL plugin
http://docs.geotools.org/stable/userguide/library/coverage/imageio.html
which seems to contain GDAL GeoTIFF driver
-Jukka Rahkonen-
________________________________________
Re: [Geoserver-users] geotiff compression with predictor
Thanks, Andrea. For now, I'm just planning to avoid using compression
predictors in any GeoTiFFs.
When we get data from other sources, we don't always know how the
files were generated. As far as I can tell, gdalinfo will indicate if
compression is used in a GeoTIFF, but it doesn't say what predictor
was used. However, tiffinfo will report the predictor. Of course,
one can always use gdal_translate to ensure that no compression
predictor is used.
Hopefully this info will be useful for others troubleshooting in the
future...
Cheers,
Keith
On Thu, May 25, 2017 at 3:18 AM, Andrea Aime

Hi Keith,
as far as I know predictor=3 is completely unknown to the TIFF reader,

and

the type=2 does not support 32 bit data.
There is a ticket open in imageio-ext (the library we use to read TIFF)
about this,
https://github.com/geosolutions-it/imageio-ext/issues/58
Cheers
Andrea

I've run into a WMS rendering problem with some compressed GeoTIFF
files that were generated using gdal_translate. When the problem
<ServiceException>
Error rendering coverage on the fast path
java.lang.NullPointerException
java.lang.NullPointerException
</ServiceException>
https://gist.github.com/kgjenkins/5128f5afd3f82167e391c98a1c02f8f8
I'm running GeoServer 2.10.0 on Linux.
I've tried various compression options, and the problem seems to occur
whenever I use gdal_translate -co PREDICTOR=2 or 3, and this happens
with both COMPRESS=LZW or DEFLATE. With no compression, or with
PREDICTOR=1 (the default, no prediction), everything works fine.)
I've searched the archives of this list, and this seems to be the same
https://sourceforge.net/p/geoserver/mailman/message/32426808/
The only other mention seems to confirm the lack of GeoServer support
https://sourceforge.net/p/geoserver/mailman/message/28400721/
For now, I'm content to simply use GeoTIFFs with no compression

predictor.

But is this something that should be submitted as a GeoServer issue?
In my search to see if such an issue already existed, I did find this
related issue for the GeoTools project. Here's the link, in case it
https://osgeo-org.atlassian.net/browse/GEOT-5542
Thanks for any guidance,
Keith

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