Hi Michael,
This certainly answers my question, now I can do things the GeoTools way!
Again, if you want a fixed resolution (say 800 x 600), since we're using
scaling factors then the following should do the trick:
// create new GridGeometry with half as many cells
GridEnvelope2D newGridEnv = new GridEnvelope2D(
curGridEnv.x, curGridEnv.y, 800 / curGridEnv.width,
600 / curGridEnv.height);
GridGeometry newGridGeom = new GridGeometry2D(newGridEnv, curWorldEnv);
etc.
Jon
On 20 May 2010 13:32, Michael Bedward <michael.bedw...@gmail.com> wrote:
> Hi Linda, Jon,
>
> Sorry - didn't realize you were still stuck ! I hadn't been following
> the last few messages on this thread.
>
> If what you want to do is retain the coverage's world bounds but alter
> its resolution (ie. its grid bounds) you can do as in the code snippet
> below. Note that I'm not reprojecting in this example, though you can
> do that at the same time by setting the "CoordinateReferenceSystem"
> parameter.
>
> /*
> * Resample a grid to half the current resolution
> */
> GridCoverage2D cov = ...
>
> DefaultProcessor processor = new DefaultProcessor(null);
>
> ParameterValueGroup parameters =
> processor.getOperation("Resample").getParameters();
>
> parameters.parameter("Source").setValue(cov);
>
> // interpolation can be NearestNeighbor, Bilinear or Bicubic
> parameters.parameter("InterpolationType").setValue("NearestNeighbor");
>
> GridGeometry2D curGridGeom = cov.getGridGeometry();
> Envelope curWorldEnv = curGridGeom.getEnvelope2D();
>
> GridEnvelope2D curGridEnv = curGridGeom.getGridRange2D();
>
> // create new GridGeometry with half as many cells
> GridEnvelope2D newGridEnv = new GridEnvelope2D(
> curGridEnv.x, curGridEnv.y, curGridEnv.width / 2,
> curGridEnv.height / 2);
> GridGeometry newGridGeom = new GridGeometry2D(newGridEnv, curWorldEnv);
>
> parameters.parameter("GridGeometry").setValue(newGridGeom);
> GridCoverage2D resampledCov = (GridCoverage2D)
> processor.doOperation(parameters);
>
> Does this help ?
>
> Michael
>
>
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