Andrea, I think part of the problem here is that there are no pixels anywhere near -9999 once the reprojected geotiff has been generated. gdalinfo -stats only returns positive values in this case.
Thanks, Dave > On Jan 23, 2016, at 6:27 AM, Andrea Aime <[email protected]> wrote: > > On Wed, Jan 20, 2016 at 2:45 PM, Ruff, Thomas <[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! 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