Re: [Geoserver-users] NODATA value not used for fill in reprojected tif

[Ruff, T. <THO...@sa...>]

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: and...@gm... [and...@gm...] on behalf of Andrea Aime [and...@ge...]
Sent: Saturday, January 23, 2016 6:27 AM
To: Ruff, Thomas
Cc: geo...@li...
Subject: Re: [Geoserver-users] NODATA value not used for fill in reprojected tif

On Wed, Jan 20, 2016 at 2:45 PM, Ruff, Thomas <THO...@sa...<mailto:THO...@sa...>> 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
http://twitter.com/geosolutions_it


AVVERTENZE AI SENSI DEL D.Lgs. 196/2003

Le informazioni contenute in questo messaggio di posta elettronica e/o nel/i file/s allegato/i sono da considerarsi strettamente riservate. Il loro utilizzo è consentito esclusivamente al destinatario del messaggio, per le finalità indicate nel messaggio stesso. Qualora riceviate questo messaggio senza esserne il destinatario, Vi preghiamo cortesemente di darcene notizia via e-mail e di procedere alla distruzione del messaggio stesso, cancellandolo dal Vostro sistema. Conservare il messaggio stesso, divulgarlo anche in parte, distribuirlo ad altri soggetti, copiarlo, od utilizzarlo per finalità diverse, costituisce comportamento contrario ai principi dettati dal D.Lgs. 196/2003.



The information in this message and/or attachments, is intended solely for the attention and use of the named addressee(s) and may be confidential or proprietary in nature or covered by the provisions of privacy act (Legislative Decree June, 30 2003, no.196 - Italy's New Data Protection Code).Any use not in accord with its purpose, any disclosure, reproduction, copying, distribution, or either dissemination, either whole or partial, is strictly forbidden except previous formal approval of the named addressee(s). If you are not the intended recipient, please contact immediately the sender by telephone, fax or e-mail and delete the information in this message that has been received in error. The sender does not give any warranty or accept liability as the content, accuracy or completeness of sent messages and accepts no responsibility  for changes made after they were sent or for other risks which arise as a result of e-mail transmission, viruses, etc.

-------------------------------------------------------