[gdal-dev] GDAL (via Java bindings) and ECW

[Ronan Crowley]

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
file.

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
memory)

Thanks,
Ronan


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.
> Greg
>
> $ 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 ?
>
> Thanks,
> Ronan
>
>
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