Le mardi 22 décembre 2015 14:38:30, Aaron Boxer a écrit : > On Tue, Dec 22, 2015 at 4:34 AM, Jukka Rahkonen < > > jukka.rahko...@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. -- Spatialys - Geospatial professional services http://www.spatialys.com _______________________________________________ gdal-dev mailing list gdal-dev@lists.osgeo.org http://lists.osgeo.org/mailman/listinfo/gdal-dev
