Re: [Geotools-gt2-users] WritableRaster and GridCoverageBuilder

[Oleg72 <ev...@iw...>]

Unfortunately it does not work
I tried:
RenderedImage rImg = cov.getRenderedImage();
TiledImage tImg = new TiledImage(rImg, true);
float c = (float)100;
for (int numXtiles=0; numXtiles<tImg .getNumXTiles(); numXtiles++){
	for (int numYtiles=0; numYtiles<tImg .getNumYTiles(); numYtiles++){
		WritableRaster wr = tImg.getWritableTile(numXtiles, numYtiles);
		for (int yy=0; yy<wr.getHeight(); yy++){
			for (int xx=0; xx<wr.getWidth(); xx++){
				wr.setSample(wr.getMinX()+xx, wr.getMinY()+yy, 0, c);
			}
		}
                tImg.releaseWritableTile(numXtiles, numYtiles);
	}
}

On the loop 1880 program is terminated with the following error:
"Exception in thread "main" java.lang.RuntimeException: Cannot construct
DataBuffer."



Michael Bedward wrote:
> 
> try this...
> 
> RenderedImage rImg = cov.getRenderedImage();
> TiledImage tImg = new TiledImage(rImg, true);
> 
> then work with the TiledImage which, in effect, is a writable view of
> your coverage's raster
> 
> Caveat: I haven't done this with really large coverages.
> 
> Let us know how you go.
> 
> Michael
> 
> 2008/9/27 Oleg72 <ev...@iw...>:
>>
>> Dear All,
>> I am trying to read and edit large ESRI Ascii Grid.
>> To edit small grids the following works fine:
>> (WritableRaster)RenderedImage().getData();
>>
>> Unfortunately this approach does not work with large Grids.
>> * Is there a way to make GridCoverage2D created from large ascii Grid
>> editable?
>>
>> At the moment the only way to solve this problem is to create new
>> GridCoverage2D using GridCoverageBuilder and copy data (floating) into
>> it.
>> The only problem at the moment is to define number of digits after
>> decimal
>> point.
>> If I am writing value 0.001 and reading it back I am getting 0.0 same
>> problem with saving grid to file.
>> * How do I define the number of decimal places for values stored in
>> GridCoverage2D?
>> Any help would be highly appreciated.
>> Oleg
>> --
>> View this message in context:
>> http://www.nabble.com/WritableRaster-and-GridCoverageBuilder-tp19690976p19690976.html
>> Sent from the geotools-gt2-users mailing list archive at Nabble.com.
>>
>>
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