Hello, In my project I need to render a map that consists of several GeoTiff-files, which are in EPSG:2393, in EPSG:2392. While GeoTools makes the transformation fine, but it leaves black or brown (value 0.0) borders around the geotiffs when rendering. The transformation involves rotating the geotiffs. Because of this, the single geotiffs have very large and visible seams instead of forming a nice and continuous map.
This is illustrated in the attached picture with two different geotiffs
(different maps altogether) used as a background. I render the map context with
different geotiffs added as layers in pieces of 400x400 px which are stored in
a cache.
Is there a way to change how the borders are handled? Preferrably the renderer
should draw only the existing data or draw the borders with full transparency.
I noticed that there is Resample.BACKGROUND_VALUES hint in
org.geotools.coverage.processing.operation. Is it the right thing to use and
how can I pass it to the rendering pipeline?
Thank you very much,
Markus<<attachment: mapseams.jpg>>
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