[gdal-dev] GDAL (via Java bindings) and ECW
ronan.crowley at gmail.com
Thu Nov 18 12:03:30 EST 2010
Thanks for the replied Guys.
My use of GDAL is very generic, allowing any end user visuaise any image
format that GDAL supports via a web browser using a Java backing with JNI
bindings to GDAL binaries. (This particular 6MB ECW file is one of hundreds
that I've tested)
The code as-is works for all image formats and for sub-portions of the ECW
I guess my question should be more directed to the Java bindings directly
and if there is anythings that I can do there... As its at this stage
(allocating the Java memory in byte that my applicaiton is running out of
On 18 November 2010 15:54, Greg Coats <gregcoats at mac.com> wrote:
> From a JPEG2000 image, you can use kdu_expand -reduce to quickly extract an
> image of the top (or any other) level pyramid. In the example below, I
> extract from a JPEG2000 image, pyramid level 10 from a 142 GB image in 0.10
> seconds. Perhaps you could consider using JPEG2000.
> $ ls -hl dcua0171_BigTiffYes.tif dcua0171_BigTiffYes_rev.jp2
> 142G Feb 16 2010 dcua0171_BigTiffYes.tif
> 58G Feb 16 2010 dcua0171_BigTiffYes_rev.jp2
> $ /usr/bin/time $kdu_expand -i dcua0171_BigTiffYes_rev.jp2 -o reduce10.tif
> -reduce 10
> Copying Geo box info, size = 387
> 0.10 real 0.08 user 0.02 sys
> $ ls -hl reduce10.tif
> 143K Nov 18 10:37 reduce10.tif
> On Nov 18, 2010, at 10:24 AM, Ronan Crowley wrote:
> Hi All,
> I'm using GDAL (via Java) to view an ECW file.
> It generally works fine, however I'm having serious memory issues.
> I have a 6MB ECW file, that when I try to view in its entirety I get
> OutOfMemory errors.
> The code I'm using to extract the image is pretty much the code from the
> GDALtest.java file in the swig sub-project.
> What I'm wodering, is if there is any way to get the number of pyramid
> levels inside the image and grab the top-most pyramid level image ?
> gdal-dev mailing list
> gdal-dev at lists.osgeo.org
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