Rendering of rotated tiled coverages
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Key: GEOT-1617
URL: http://jira.codehaus.org/browse/GEOT-1617
Project: GeoTools
Issue Type: Improvement
Components: core render
Environment: windows, solaris, 64MB heap size, any big enough image
with world file with nonzero second and third line
Reporter: Jaroslav Kubos
Assignee: Jesse Eichar
Hi all. We are trying to render huge (21000x21000px) GeoTiff which is
internally tiled and contain overviews. It is created from image and worldfile
by GDAL. When it is not rotated ("rotation term" field for row and column in
worldfile) everything works fine, memory consumption is small. But in case it
is rotated, rendering takes big amount of memory. I debugged it and the problem
is in "GridCoverageRenderer" in method "paint":
Because image is rotated this condition will pass
-- if(!isScaleTranslate(gridCoverage.getGridGeometry().getGridToCRS())) {
then because we render in one CRS this condition will not pass
-- if (doReprojection) {
then is called
-- graphics.drawRenderedImage(finalImage, clonedFinalWorldToGrid);
which will fail on "Java heap space OutOfMemory Error". Because (Java
documentation):
-- Renders a RenderedImage, applying a transform from image space into user
space before drawing.
So one possible solution is to use gdalwarp utility to remove rotation from
image. That is how we work now.
Second possibility is to improve geotools way of rendering tiled rotated
coverages. The improvement could be to render each tile inside rendering bbox
separately. It will be probably quite slow but better than exception.
If you want I think I am able to implement this feature. Though some hints
about classes/methods I should use could be helpful.
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