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]>
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
>
>
>
>
>
>
>
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