Sorry - wrong mail address. Again....
Hello again,
another question I have is how to work with GridCoverage2D objects.
To do any operation with the grid values I tried to store them in an
array:
GridCoverage2D gridCoverage = (GridCoverage2D) grid; // grid is an
Object
/*System.out.println("### GridCoverage2D Info ###");
System.out.println("# Min: " + gridCoverage.getSampleDimension
(0).getMinimumValue());
System.out.println("# Max: " + gridCoverage.getSampleDimension
(0).getMaximumValue());
System.out.println("# NoData: " + gridCoverage.getSampleDimension
(0).getNoDataValues());
gridCoverage.show("TestTIFF");*/
RenderedImage renderedImage = gridCoverage.getRenderedImage();
Raster renderedGrid = renderedImage.getData();
/*System.out.println("### Raster Info ###");
System.out.println("# Height: " + renderedGrid.getHeight());
System.out.println("# Width: " + renderedGrid.getWidth());
System.out.println("# NumberOfBands: " + renderedGrid.getNumBands());*/
// Get data values of the grid
int gridMinX = renderedGrid.getMinX();
int gridMinY = renderedGrid.getMinY();
int gridWidth = renderedGrid.getWidth();
int gridHeight = renderedGrid.getHeight();
double[] dataBlock = null;
dataBlock = renderedGrid.getPixels(gridMinX, gridMinY, gridWidth,
gridHeight, dataBlock);
double[][] gridValues = new double[gridHeight][gridWidth];
int base;
for (int i=0; i<gridHeight; i++) {
base = i * gridWidth;
//System.arraycopy(dataBlock, base, gridValues[i], 0, gridWidth);
}
int numRows = gridValues.length;
int numCols = gridValues[0].length;
/*System.out.println("### Values Info ###");
System.out.println("# NumCols: " + numCols);
System.out.println("# NumRows: " + numRows);
System.out.println("# Samples:");
for (int i=0; i<5; i++) {
System.out.println("Line " + (i+1));
for (int j=0; j<10; j++) {
System.out.println(" Row " + (j+1) + " = " +
gridValues[i][j]);
}
}*/
Unfortunately I get an OutOfMemory: Java Heap Space exception,
althought my test grid is not really a large one (somewhat 2800 x
2500 pixels). If I give Java more memory, the error does not disappear.
Now my question: Is there I better solution to access and work with
the grid values - maybe directly from the GridCoverage2D - to avoid
the data transfer to an array? Or what else can I do?
Thanks,
Christian
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