Thanks for the background on NODATA support Andrea, and the info on different
handling for the image/geotiff output format Ian. That is very helpful.
I'll try upgrading and see how it behaves with the java option enabled.
Staying on 2.7 and changing the style sounds a little trickier because the
geotiffs are not being added manually and the value geoserver is assigning to
the generated fill points seems non-deterministic to me. Also, in one of the
geotiffs I've tested the value assigned to the fill points appears to be a
value used in the original raster.
Thanks,
Tom
________________________________
From: [email protected] [[email protected]] on behalf of Andrea Aime
[[email protected]]
Sent: Saturday, January 23, 2016 6:27 AM
To: Ruff, Thomas
Cc: [email protected]
Subject: Re: [Geoserver-users] NODATA value not used for fill in reprojected tif
On Wed, Jan 20, 2016 at 2:45 PM, Ruff, Thomas
<[email protected]<mailto:[email protected]>> wrote:
I have a geotiff with a custom Pacific-centered projection. The tif has a
single band with NODATA value set to -9999. When I request the layer from
geoserver in the native projection it looks correct.
There is a simple explanation for that, no GeoServer release before 2.8.0 has
any support for NODATA in its raster
operations.
And even the 2.8.x series by default won't work properly with NODATA, one has
to activate a certain flag to add an experimental support for it.
The reason is that the low level library used to perform image processing, JAI,
has no notion of what NODATA is. We have build
a replacement called jai-ext that has explicit NODATA support (
https://github.com/geosolutions-it/jai-ext), and had 2.8.0xuse it
as an option, but by the time we had to release some kinks still had to be
worked out so we disabled it by default, however one can
make it come to life by adding the "-Dorg.geotools.jaiext.enabled=true" system
variable to the java command starting up
GeoServer.
If you want to stay on 2.7.x I'd suggest you change your style so that the
pixels at -9999 are marked as transparent in the
colormap, otherwise we are about to release 2.8.2, you can install it, enable
jai-ext, and see if the output gets better.
If not, then we'd indeed like to have a bug report filed :-)
2.8.2 is not officially released yet but release artifacts can already be
downloaded here, if you want to try them out:
http://ares.boundlessgeo.com/geoserver/release/2.8.2/
Cheers
Andrea
--
==
GeoServer Professional Services from the experts! Visit
http://goo.gl/it488V for more information.
==
Ing. Andrea Aime
@geowolf
Technical Lead
GeoSolutions S.A.S.
Via Poggio alle Viti 1187
55054 Massarosa (LU)
Italy
phone: +39 0584 962313
fax: +39 0584 1660272
mob: +39 339 8844549
http://www.geo-solutions.it
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