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<font size="3" face="Comic Sans MS">All,</font> </p>
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<font size="3" face="Comic Sans MS">I agree, very good conversation, I've already pointed a few folks at it as the same topic has come up here at work on two different projects, as well as a Survey I just completed yesterday for a Federal data provider. I pointed the survey taker at this thread as well.</font> </p>
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<font size="3" face="Comic Sans MS">bobb</font> </p>
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>>> "Landon Blake" <lblake@ksninc.com> wrote:<br> </p>
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I think we were talking about the easiest way to implement saving space. :]<o p="#DEFAULT"></o> </p>
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I was trying to point out (and maybe Paul was also) that ease of implementation (now or in the future) should be a factor the government chooses when selection a file format/technology for data storage and distribution to the public.<o p="#DEFAULT"></o> </p>
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There are a number of other factors, as MPG mentioned. <o p="#DEFAULT"></o> </p>
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This has been a really good discussion, and I will try to get some content about open file formats on the wiki as Arnulf requested. Maybe next week?<o p="#DEFAULT"></o> </p>
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Landon </p>
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Office Phone Number: (209) 946-0268 </p>
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Cell Phone Number: (209) 992-0658 </p>
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From: </p>
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discuss-bounces@lists.osgeo.org [mailto:discuss-bounces@lists.osgeo.org] </p>
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On Behalf Of </p>
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Bob Basques<br> </p>
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Sent: </p>
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Friday, August 21, 2009 11:28 AM<br> </p>
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To: </p>
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OSGeo Discussions</st1>; Ivan Lucena<br> </p>
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Subject: </p>
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RE: [OSGeo-Discuss] OpenFile FormatsandProprietaryAlgorithms[SEC=UNCLASSIFIED] </p>
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All, </p>
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Can someone remind me again, are we talking about saving space, or making it easier to implement something . . . :c) </p>
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I personally prefer nice simple internal pyramided tiles with indexing, about 10% extra space, and very good performance. </p>
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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. </p>
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bobb </p>
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>>> "Lucena, Ivan" <ivan.lucena@pmldnet.com> wrote:<o p="#DEFAULT"></o> </p>
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But you can't compress data types other than byte in JPG. Can you do that in JP2K?<br><br><br>> -------Original Message-------<br>> From: <st1 st="on" personname="#DEFAULT" w="#DEFAULT">Landon Blake</st1> <lblake@ksninc.com><br>> Subject: RE: [OSGeo-Discuss] Open FileFormatsandProprietaryAlgorithms[SEC=UNCLASSIFIED]<br>> Sent: Aug 21 '09 12:42<br>> <br>> Paul,<br>> <br>> I was wondering the same thing.<br>> <br>> It seems a little like choosing to drive a Honda Accord, or a Ferrari.<br>> The Ferrari is a lot faster and comes with a better looking trophy wife<br>> (or husband), but the Honda is a lot easier to fix. (Try finding an<br>> affordable Ferrari mechanic in <st1 st="on" place="#DEFAULT" w="#DEFAULT"><st1 city="#DEFAULT" st="on" w="#DEFAULT">Stockton</st1>, <st1 st="on" state="#DEFAULT" w="#DEFAULT">California</st1></st1>.)<br>> <br>> To tie this back into our original discussion, it seems like the<br>> government should be choosing to drive a Honda Accord when it can,<br>> instead of the Ferrari.<br>> <br>> I guess you'd really have to crunch the numbers and see if the savings<br>> in bandwidth/disk space costs were really worth the compression savings<br>> that result from a proprietary compression scheme ("wavelet black<br>> magic").<br>> <br>> The problem with this is a lot of the benefits that come from the Honda<br>> Accord (open image format + open compression algorithm) aren't easily<br>> calculated in dollars and cents.<br>> <br>> Still, this speaks to an important truth I have discovered in open<br>> source development: Simple is better, even when it isn't necessarily<br>> faster and smaller.<br>> <br>> I'd rather have code that I can understand, or a file format that a<br>> programmer in 20 years will understand, than a Ferrari you can't drive<br>> unless you have a PHD and did a thesis on wavelet compression. :]<br>> <br>> Landon<br>> Office Phone Number: (209) 946-0268<br>> Cell Phone Number: (209) 992-0658<br>> <br>> <br>> <br>> -----Original Message-----<br>> From: discuss-bounces@lists.osgeo.org<br>> [mailto:discuss-bounces@lists.osgeo.org] On Behalf Of Paul Ramsey<br>> Sent: Friday, August 21, 2009 10:36 AM<br>> To: <st1 st="on" personname="#DEFAULT" w="#DEFAULT">OSGeo Discussions</st1><br>> Subject: Re: [OSGeo-Discuss] Open File<br>> FormatsandProprietaryAlgorithms[SEC=UNCLASSIFIED]<br>> <br>> So hung up on wavelets, we are.<br>> <br>> Internally tiled TIFF with JPEG compression and similarly formatted<br>> internal overviews can achieve 10:1 compression rates without<br>> noticeable image quality reductions, and as an added bonus can be<br>> decompressed a heck of a lot faster than wavelet-based formats. The<br>> wavelet stuff is k00l, in that there is no need for an overview<br>> pyramid (it's implicit in the compression math) and much higher<br>> compression rates can be achieved. But operationally, you can go a<br>> long way with the more primitive (open image format + open compression<br>> algorithm) approach.<br>> <br>> P.<br>> _______________________________________________<br>> Discuss mailing list<br>> Discuss@lists.osgeo.org<br>> <a href="http://lists.osgeo.org/mailman/listinfo/discuss">http://lists.osgeo.org/mailman/listinfo/discuss</a><br>> <br>> <br>> Warning:<br>> Information provided via electronic media is not guaranteed against defects including translation and transmission<br>errors. If the reader is not the intended recipient, you are hereby notified that any dissemination, distribution or<br>copying of this communication is strictly prohibited. If you have received this information in error, please notify the<br>sender immediately.<br>> _______________________________________________<br>> Discuss mailing list<br>> Discuss@lists.osgeo.org<br>> <a href="http://lists.osgeo.org/mailman/listinfo/discuss">http://lists.osgeo.org/mailman/listinfo/discuss</a><br>> <br>_______________________________________________<br>Discuss mailing list<br>Discuss@lists.osgeo.org<br><a href="http://lists.osgeo.org/mailman/listinfo/discuss">http://lists.osgeo.org/mailman/listinfo/discuss</a><o p="#DEFAULT"></o> </p>
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