[Geoserver-users] Geoserver 2.7.2 raster reprojection to wgs84 - strange behavior

[dracic <dav...@gm...>]

Hello everyone,

i noticed some strange behavior today with rasters served through WMS
(ImagePyramid layer) stored in EPSG:3765 - HTRS96 Croatia TM but requested
with WGS84 on client side. As EPSG:3765 is incorporated into ArcGIS since
10.x version, the only supported SRS for the layer in 9.3 is WGS84. At first
I thought it could be an ArcGIS 9.3 issue due to some custom
projection/transformation errors or misconfiguration, but the same error
happens in QGIS when project is set to EPSG:3765, on the fly reprojection
turned on and WMS layer requested with WGS84. When zooming in and out and
panning, you can see some shifts in raster data. I created some screenshots
here:

http://dracic.tumblr.com/

Images are taken at scales 1:1000 & 1:2500, vector data is in EPSG:3765

I use bilinear interpolation, but changing it to something else in WMS
settings doesn't change anything. Also, tried with setting advanced
reprojection to false in tomcat config and it doesn't change anything. I
turned off native warp acceleration in JAI settings, because I was worried
about potential JVM crashes, but to test the issue I turned it on, and the
issue was gone.

Can anyone explain this behavior? Is it safe to use native warp
acceleration?

Best regards
Davor



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