Ivan, Ignoring the danger that this thread will devolve into a discussion about different raster formats, I will ask you for some specifics.
What are the limitations of Geotiff/JPEG compared with the proprietary alternatives? Maybe we need to cook up a "Guide To Raster Data File Formats for Storage and Distribution of Public Data". :] Landon Office Phone Number: (209) 946-0268 Cell Phone Number: (209) 992-0658 -----Original Message----- From: discuss-boun...@lists.osgeo.org [mailto:discuss-boun...@lists.osgeo.org] On Behalf Of Lucena, Ivan Sent: Friday, August 21, 2009 11:54 AM To: Bob Basques; OSGeo Discussions Subject: RE: [OSGeo-Discuss] Open File FormatsandProprietaryAlgorithms[SEC=UNCLASSIFIED] Bob, Sorry to mess with discussion but if someone is suggesting the use of Geotiff with JPEG compressed as a "Open File Format" (copied and pasted from the thread title) I would like to remember myself and the audience obout the data type limitations. There's more in raster data than meet the eye, and that usually doesn't come in unsigned integer 8 bits. :) Regards, Ivan > -------Original Message------- > From: Bob Basques <bob.basq...@ci.stpaul.mn.us> > Subject: RE: [OSGeo-Discuss] Open File > FormatsandProprietaryAlgorithms[SEC=UNCLASSIFIED] > Sent: Aug 21 '09 13:27 > > All, > > > Can someone remind me again, are we talking about saving space, > or making it easier to implement something . . . :c) > > > I personally prefer nice simple internal pyramided tiles with > indexing, about 10% extra space, and very good performance. > > > Someone earlier in this thread spoke about some of these technologies > being somewhat obsolete what with the new network and bandwidth speeds > available for publishing. > > > bobb > > > >>> "Lucena, Ivan" <ivan.luc...@pmldnet.com> wrote: > > > But you can't compress data types other than byte in JPG. Can you do > that in JP2K? > > > > -------Original Message------- > > From: Landon Blake <lbl...@ksninc.com> > > Subject: RE: [OSGeo-Discuss] Open > FileFormatsandProprietaryAlgorithms[SEC=UNCLASSIFIED] > > Sent: Aug 21 '09 12:42 > > > > Paul, > > > > I was wondering the same thing. > > > > It seems a little like choosing to drive a Honda Accord, or a > Ferrari. > > The Ferrari is a lot faster and comes with a better looking trophy > wife > > (or husband), but the Honda is a lot easier to fix. > (Try finding an > > affordable Ferrari mechanic in Stockton, California.) > > > > To tie this back into our original discussion, it seems like > the > > government should be choosing to drive a Honda Accord when it > can, > > instead of the Ferrari. > > > > I guess you'd really have to crunch the numbers and see if the > savings > > in bandwidth/disk space costs were really worth the compression > savings > > that result from a proprietary compression scheme ("wavelet > black > > magic"). > > > > The problem with this is a lot of the benefits that come from the > Honda > > Accord (open image format + open compression > algorithm) aren't easily > > calculated in dollars and cents. > > > > Still, this speaks to an important truth I have discovered in > open > > source development: Simple is better, even when it isn't > necessarily > > faster and smaller. > > > > I'd rather have code that I can understand, or a file > format that a > > programmer in 20 years will understand, than a Ferrari you > can't drive > > unless you have a PHD and did a thesis on wavelet compression. > :] > > > > Landon > > Office Phone Number: (209) 946-0268 > > Cell Phone Number: (209) 992-0658 > > > > > > > > -----Original Message----- > > From: discuss-boun...@lists.osgeo.org > > [mailto:discuss-boun...@lists.osgeo.org] On Behalf Of Paul > Ramsey > > Sent: Friday, August 21, 2009 10:36 AM > > To: OSGeo Discussions > > Subject: Re: [OSGeo-Discuss] Open File > > FormatsandProprietaryAlgorithms[SEC=UNCLASSIFIED] > > > > So hung up on wavelets, we are. > > > > Internally tiled TIFF with JPEG compression and similarly > formatted > > internal overviews can achieve 10:1 compression rates without > > noticeable image quality reductions, and as an added bonus can > be > > decompressed a heck of a lot faster than wavelet-based formats. > The > > wavelet stuff is k00l, in that there is no need for an > overview > > pyramid (it's implicit in the compression math) and > much higher > > compression rates can be achieved. But operationally, you can > go a > > long way with the more primitive (open image format + open > compression > > algorithm) approach. > > > > P. > > _______________________________________________ > > Discuss mailing list > > Discuss@lists.osgeo.org > > [LINK: http://lists.osgeo.org/mailman/listinfo/discuss] > http://lists.osgeo.org/mailman/listinfo/discuss > > > > > > Warning: > > Information provided via electronic media is not guaranteed > against defects including translation and transmission > errors. If the reader is not the intended recipient, you are hereby > notified that any dissemination, distribution or > copying of this communication is strictly prohibited. If you have received > this information in error, please notify the > sender immediately. > > _______________________________________________ > > Discuss mailing list > > Discuss@lists.osgeo.org > > [LINK: http://lists.osgeo.org/mailman/listinfo/discuss] > http://lists.osgeo.org/mailman/listinfo/discuss > > > _______________________________________________ > Discuss mailing list > Discuss@lists.osgeo.org > [LINK: http://lists.osgeo.org/mailman/listinfo/discuss] > http://lists.osgeo.org/mailman/listinfo/discuss _______________________________________________ Discuss mailing list Discuss@lists.osgeo.org http://lists.osgeo.org/mailman/listinfo/discuss Warning: Information provided via electronic media is not guaranteed against defects including translation and transmission errors. If the reader is not the intended recipient, you are hereby notified that any dissemination, distribution or copying of this communication is strictly prohibited. If you have received this information in error, please notify the sender immediately. _______________________________________________ Discuss mailing list Discuss@lists.osgeo.org http://lists.osgeo.org/mailman/listinfo/discuss
