[gdal-dev] OpenJPEG

[Aaron Boxer]

On Tue, Dec 22, 2015 at 4:34 AM, Jukka Rahkonen <
jukka.rahkonen at maanmittauslaitos.fi> wrote:

> Aaron Boxer <boxerab <at> gmail.com> writes:
>
>
> > This feature would be quite involved: one would have to gather all of the
> layers for
> >
> > all of the code blocks in all of the precincts overlapping that
> sub-tile,plus the immediately surrounding precincts, run the inverse
> entropy
> coder to get the wavelet coefficients, and then do an inverse wavelet
> transform,with this incomplete set of coefficients.
> >
>
> I do not claim that I understand GIS but I have a feeling that precincts
> are
> designed for a fast ROI access. From
> http://www2.engr.arizona.edu/~bilgin/publications/SPIE2004_2.pdf
>
> "A precinct is a collection of code-blocks representing some finite spatial
> extent at some resolution."
>
> Probably gathering the surrounding precincts is unnecessary. Author of
> Kakadu seems to dislike tiles and it is no wonder that with Kakadu
> precincts
> perform well even with archived documents
> http://www.digitizationguidelines.gov/still-image/documents/Martin.pdf.
>


Thanks, that paper was an interesting discussion of optimal encoding
settings in the archive world.

What are typical j2k encoding settings in geo-spatial use case ?

I have been looking primarily at digital cinema profiles up to now, where
many J2K features are not allowed,
features such as tiling.
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