Hi Andrea, Thanks. Yes I have Bilinear interpolation on. Nearest N. gave far worse results. Hard to see a difference with Bicubic. Also before ENABLE_ADVANCED_PROJECTION=false Bilinear gave the best results.
Best, Just On 19-02-15 08:50, Andrea Aime wrote: > Hi Just, > you do have bilinear interpolation on, yes? > The issue is known, we are working on a solution, here: > https://github.com/aaime/geotools/commits/warp_affine_aph > > Still need to perform some checks before we merge it. The gist of it is > that currently in order to handle > difficult projections we are doing first a reprojection and then a > rescale to the desired target resolution, > which with bilinear interpolation result in a double resampling, the > patch modifies the code paths > so that we can leverage the "warp/affine" reduction, that is, a code > path that notices a reprojection > and and affine need to be performed in sequence, and merges the two in a > single operation, thus > getting us a single bilinear resample > > Cheers > Andrea > > On Wed, Feb 18, 2015 at 11:07 PM, Just van den Broecke > <[email protected] <mailto:[email protected]>> wrote: > > Hi, > > First of all, I appreciate the hard work you folks, in particular at > GeoSolutions, are doing, already for many years, on raster. > > I noticed when upgrading from 2.4.3 to 2.6.1 that reprojected raster > images from an Image Mosaic GeoTIFF source became less sharp. I > tried many raster settings but to no avail. I noticed that in 2.6.2 > "Advanced Raster Projection" could be switched off. Via the > Java-code it appeared that this can be effected by setting > ENABLE_ADVANCED_PROJECTION=__false in e.g. the Tomcat environment > settings. After upgrading to 2.6.2 and adding that setting, this > immediately gave better/sharper results. See attached image for the > differences before/after the setting. The original imagery is in > EPSG:28992 and the reprojected/warped in EPSG:900913. There are no > problems in rendering in the original projection, only when > reprojecting/warping. > > I am not sure why the above worked for me, but I thought I share > this. Maybe it helps in further development. I can give more context > if needed. > > Best, > > --Just > > Just van den Broecke > www.justobjects.nl <http://www.justobjects.nl> > > > > > > > > ------------------------------------------------------------------------------ > Download BIRT iHub F-Type - The Free Enterprise-Grade BIRT Server > from Actuate! Instantly Supercharge Your Business Reports and Dashboards > with Interactivity, Sharing, Native Excel Exports, App Integration & > more > Get technology previously reserved for billion-dollar corporations, FREE > > http://pubads.g.doubleclick.net/gampad/clk?id=190641631&iu=/4140/ostg.clktrk > _______________________________________________ > Geoserver-users mailing list > [email protected] > <mailto:[email protected]> > https://lists.sourceforge.net/lists/listinfo/geoserver-users > > > > > -- > == > GeoServer Professional Services from the experts! Visit > http://goo.gl/NWWaa2 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. 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