On Fri, Dec 16, 2016 at 1:52 PM, Even Rouault <even.roua...@spatialys.com> wrote:
> > > > Wondering if when generating overviews we still have a problem similar to > > > the one you have fixed in 2.0 or some data-updating issue. > > > > > > These are my hypothesis on what is going on. > > > A simple translate with no overviews makes the file ending at 0x7555 with > > > offset of next IFD saying 0x0000. > > > When you add overviews, it writes a new IFD at 0x7556 with TAG entries, > > > then it encodes something and then it writes a new IFD. > > > At the end, it goes back updating the offset of the 1st overview IFD > > > (0xBBF0) making the one at 0x7556 being not referred anymore. > > > Does it make sense? > > > > > > > With JPEG compression right ? > Right, Indeed, before sending my previous email I have also tried with: *gdaladdo -r average --config COMPRESS_OVERVIEW DEFLATE --config PHOTOMETRIC_OVERVIEW RGB* to understand if it was related to JPEG only but, even with these options, the output overviews were jpeg compressed (I assume there is some kind of coherency check in gdaladdo). > I do reproduce something similar to your findings in 2.1 indeed. This no > longer happens in trunk due to related improvements ( > https://trac.osgeo.org/gdal/wiki/CloudOptimizedGeoTIFF), I made in the > last couple of weeks (using the same trick of creating a in-memory TIFF > file to get the JPEG tables and set them direcly on the overview IFD at > creation time). > > > Do you think this will be available in other series or does it introduce new API/major changes which makes it available on 2.2.x only? Thanks again for your precious feedbacks. Cheers, Daniele > Even > > > > > > -- > > Spatialys - Geospatial professional services > > http://www.spatialys.com > -- == GeoServer Professional Services from the experts! Visit http://goo.gl/it488V for more information. == Ing. Daniele Romagnoli Senior Software Engineer GeoSolutions S.A.S. Via di Montramito 3/A 55054 Massarosa (LU) Italy phone: +39 0584 962313 fax: +39 0584 1660272 http://www.geo-solutions.it http://twitter.com/geosolutions_it ------------------------------------------------------- *AVVERTENZE AI SENSI DEL D.Lgs. 196/2003* Le informazioni contenute in questo messaggio di posta elettronica e/o nel/i file/s allegato/i sono da considerarsi strettamente riservate. Il loro utilizzo è consentito esclusivamente al destinatario del messaggio, per le finalità indicate nel messaggio stesso. Qualora riceviate questo messaggio senza esserne il destinatario, Vi preghiamo cortesemente di darcene notizia via e-mail e di procedere alla distruzione del messaggio stesso, cancellandolo dal Vostro sistema. Conservare il messaggio stesso, divulgarlo anche in parte, distribuirlo ad altri soggetti, copiarlo, od utilizzarlo per finalità diverse, costituisce comportamento contrario ai principi dettati dal D.Lgs. 196/2003. The information in this message and/or attachments, is intended solely for the attention and use of the named addressee(s) and may be confidential or proprietary in nature or covered by the provisions of privacy act (Legislative Decree June, 30 2003, no.196 - Italy's New Data Protection Code).Any use not in accord with its purpose, any disclosure, reproduction, copying, distribution, or either dissemination, either whole or partial, is strictly forbidden except previous formal approval of the named addressee(s). If you are not the intended recipient, please contact immediately the sender by telephone, fax or e-mail and delete the information in this message that has been received in error. The sender does not give any warranty or accept liability as the content, accuracy or completeness of sent messages and accepts no responsibility for changes made after they were sent or for other risks which arise as a result of e-mail transmission, viruses, etc.
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