[gdal-dev] Reading jpeg 2000 compressed nitfs

[jim hopper]

Thanks.

If I build gdal with kadaku will that support it?

Best jim



On 1/25/10 11:28 PM, "Frank Warmerdam" <warmerdam at pobox.com> wrote:

> James,
> 
> I have reviewed nitfdataset.cpp and jpeg2000dataset.cpp
> (the JasPer driver) and I believe they are now compatible.
> That is, nitf now uses the /vsisubfile/ mechanism to
> operate on the jpeg2000 data stream and I see the
> JasPer driver now uses the VSI*L API needed to support
> the /vsisubfile/ mechanism.
> 
> However, most NITF files I have worked with that
> had jpeg2000 compression had single large
> compressed images, not many small tiles.
> The JasPer library does *not* provide an effective
> mechanism to read subareas so for a large image
> it tends to use as much as 10 times as much memory
> as would be needed to hold the decoded image.
> This makes it impractical for many geospatial
> applications.
> 
> So I am still dubious about using it.
> 
> Best regards,
> 
> On Tue, Jan 26, 2010 at 9:12 AM, jim hopper <JAMES.E.HOPPER at saic.com> wrote:
>> I read the item about lack of support for the J2K_SUBFILE mechanism using
>> jasper, and that it requires one of the commercial jpeg2000 drivers.  Is
>> that still the case, or Is there a way to read jpeg2k nitfs with open source
>> jpeg2k libraries?
>> 
>> Best jim
>> 
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>> 
> 
>