Due to the current gap in continued funding from the U.S. National Science Foundation (NSF), the NSF Unidata Program Center has temporarily paused most operations. See NSF Unidata Pause in Most Operations for details.
Due to the current gap in continued funding from the U.S. National Science Foundation (NSF), the NSF Unidata Program Center has temporarily paused most operations. See NSF Unidata Pause in Most Operations for details.
Hi Daniele: GRIB projection info is stored in the GRIB file in (at most) 3 bytes, so has a maximum precision of 24 bits. Im surprised that you are seeing a problem, it seems unlikely that a roundoff in the low order bit of a float should matter. But theres not really a good reason that we couldnt use doubles if needed. John On Mon, Apr 20, 2015 at 3:45 AM, Daniele Romagnoli < daniele.romagnoli@xxxxxxxxxxxxxxxx> wrote: > Hi List, > I'm using NetCDF Java 4.5.5. > I have noticed that when computing the LambertConformal projection > components (such as latin1, latin2...) in Grib1Gds I'm getting: > > latin1 = 25.00001 > latin2 = 25.05002 > dx1 = 13.545001 > dy1 = 13.545001 > > Instead of: > latin1 = 25 > latin2 = 25.05 > dx1 = 13.545 > dy1 = 13.545 > > Plus, I'm getting some additional precision loss when extracting these > attributes > from the associated grid_mapping variable, as numbers (double values). > I will surely investigate more on the topic to become more confident with > that code and I will read again about representation errors on floating > point arithmetics so my question could sounds trivial: Why these variables > and scale constants are floats instead of doubles? (is it for size and > performance issues?) > > Regards, > Daniele > > > > > == > GeoServer Professional Services from the experts! Visit > http://goo.gl/NWWaa2 for more information. > == > > Ing. Daniele Romagnoli > Senior Software Engineer > > GeoSolutions S.A.S. > Via Poggio alle Viti 1187 > 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. > > > _______________________________________________ > netcdf-java mailing list > netcdf-java@xxxxxxxxxxxxxxxx > For list information or to unsubscribe, visit: > http://www.unidata.ucar.edu/mailing_lists/ >
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