Dear geotoolers,
A small follow up which might be useful to others working with grid
coverages on Mac OS X...
The problem I was having with convolution of float rasters apparently
only afflicts Mac intel users and is caused by some glitch with the
library used for native acceleration of JAI's fun
G'day Steve,
Thanks for your reply. Your code is similar to what I've been doing.
I was calling ConvolveDescriptor.create() but peering into the JAI
source code (yikes) all that happens there is that it loads a
parameter block and calls JAI.create() for you.
Do you use float or double data grid
Hello Michael,
I've run into problems with using even sized kernels (such as 10x10) on
Mac. This was an accident - I actually wanted odd sized only. Anyway,
this is how I do convolve:
float[] kernelMatrix = new float[kernelSize*kernelSize];
for (int k=0; k Dear GT-Gurus,
As an alternative, you may want to play with ImageFunction JAI operator,
see
http://java.sun.com/products/java-media/jai/forDevelopers/jai-apidocs/javax/media/jai/operator/ImageFunctionDescriptor.html.
Which should better use memory, especially if coupled with tiling and
tile caching.
Simone.
On
I guess the easiest thing to do is first create an empty image and
then feed it to a gridcoverage factory.
Easiest way to create an empty raster with some initial values for
each band is the Constant JAI operator.
See
http://java.sun.com/products/java-media/jai/forDevelopers/jai-apidocs/javax/me
Hi Thomas,
Here's one way, though there are probably much simpler ways. This
would create a floating point image. Edit for type byte, or int or
whatever...
int size = rows * cols;
float[] data = new float[size];
DataBuffer buffer = new DataBufferFloat( data, size );
Samp
Hi,
I would like to create an "empty" single band GridCoverage2D (all points at
"0").
Next, I perform a calculation on some datas, and put points of interest
into this GridCoverage (with value other than 0), depending on their
geographic position...
Finally, I vectorize this gridcoverage to get a
