[gdal-dev] OpenJPEG

[Aaron Boxer]

On Tue, Dec 22, 2015 at 9:01 AM, Even Rouault <even.rouault at spatialys.com>
wrote:

> Le mardi 22 décembre 2015 14:38:30, Aaron Boxer a écrit :
> > 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 ?
>
> That must depend vastly on the producer.
>
> A few examples:
>
> You can download Sentinel-2 products at :
> https://scihub.copernicus.eu/s2/#/home
> up to 10980x10980 images, 12 bit, with 2048x2048 tiles
>
> Pleidas products :
> http://www.geo-airbusds.com/en/23-sample-imagery
> Bigger dimension that S-2. Also 12 bit, with 2048x2048 tiles
>
> There are likely sources that are single tiled.
>


Thanks. These sites will be very useful.

Is it standard to add TLM and PLM markers?  Because these make fast random
access
possible.
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