jared stallings a écrit :
> I have a specific need to reproject geoTIFF imagery between various
> projections for display in a viewer I already have. I have looked
> through the site, the code, javadocs and etc. Based on what I've seen,
> and in the post referenced in the subject line, it appears that this may
> be a possiblity with GeoTools, but I am having trouble finding exactly
> what to do. GeoTools does so much more that it's hard to isolate how to
> solve my specific need. Do you have any code snippets of reprojecting a
> geotiff image between different projections? If not, is this something
> I should be able to easily do with geotools?
The most tedious part is to create the GridCoverage2D object:
* Look at the geotiff module, it may provides everything needed
for creating directly a GridCoverage2D instance from a GeoTIFF
file. Simone could tell more about this module.
* If you wish to create the GridCoverage2D by hand, then:
* Read the image as a RenderedImage using Java Image I/O API.
* Create a CoordinateReferenceSystem for the image CRS. The easiest
was it to use the CRS.decode(String) convenience method if you know
the EPSG code for the CRS.
* Create a GeneralEnvelope instance with the image bounding box in
coordinates of the above-cited CRS.
* Create the GridCoverage2D instance using one of the
CoverageFactory.create
methods. You can get an instance of CoverageFactory using
org.geotools.coverage.FactoryFinder.getCoverageFactory.
* Once you have a GridCoverage2D instance, create an other
CoordinateReferenceSystem instance for the target CRS (the one you want to
reproject in). Again, the easiest way is to use CRS.decode(String) if you
know the EPSG code.
* Invoke Operations.resample(coverage, targetCRS). The Operations class is
defined in org.geotools.coverage.processing if my memory serve me right.
Martin
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