Christiane, it is worth noting that upstream the Unidata maintainers of NetCDF-Java recently removed longitude normalisation for GRIB2 files, so at the least the behaviour you report is inconsistent with that for GRIB2.
Daniele, does gt-netcdf normalise longitudes or just follow the behaviour of NetCDF-Java? Kind regards, Ben. On 16/11/16 10:54, Ben Caradoc-Davies wrote: > Christiane, > > replying to keep this thread alive and ensure that your text below goes > to the list. Thank you for the sample file; I think your email was held > by the list server because of the large attachment (I like to send links). > > Kind regards, > Ben. > > On 14/11/16 15:14, c...@habmalnefrage.de wrote: >> Hi Ben / Daniele, >> thanks for your answers. >> My version of GeoTools is 17-snapshot. The problem with the wrong coordinates >> still exists. Attached you'll find a sample file with longitude values from >> 335 >> to 405 degrees. Panoply is able to read it correctly, so I don't think it's >> an >> exceptional file. >> I took a look at the parameters parsing code >> https://github.com/geotools/geotools/blob/master/modules/plugin/coverage-multidim/netcdf/src/main/java/org/geotools/coverage/io/netcdf/NetCDFReader.java#L525 >> If I understand aright: the GeneralParameterValue, e.g. in "public >> GridCoverage2D read(GeneralParameterValue[] parameters)" can be of >> READ_GRIDGEOMETRY2D, TIME, ELEVATION,...? It seems to me, these are only the >> dimensions and that there is no possibility to get the attributes like units >> etc. of each variable in file? Do the "hints" (used in constructor of >> NetCDFReader) have anything to do with it and what kind of values can >> "hints" be of? >> kind regards, >> Christiane >> *Gesendet:* Donnerstag, 10. November 2016 um 18:01 Uhr >> *Von:* "Daniele Romagnoli" <daniele.romagn...@geo-solutions.it> >> *An:* "Ben Caradoc-Davies" <b...@transient.nz> >> *Cc:* c...@habmalnefrage.de, "geotools mailing list" >> <geotools-gt2-users@lists.sourceforge.net> >> *Betreff:* Re: [Geotools-gt2-users] Retrieving attributes and longitude >> values >> with central meridian at 360 degrees from NETCDF >> Hi Christiane, >> On Wed, Nov 9, 2016 at 10:19 PM, Ben Caradoc-Davies <b...@transient.nz >> <mailto:b...@transient.nz>> wrote: >> >> On 03/11/16 11:18, c...@habmalnefrage.de <mailto:c...@habmalnefrage.de> >> wrote: >> >> Hi list, >> I've worked through the NetCDFReaderTest and lots of other files >> lately >> but I'm >> still struggling with the NetCDF reader: >> 1.) I've managed to read the coverages from the files and the >> corresponding >> points as simple features using the RasterAsPointCollectionProcess. >> But I >> couldn't figure out how to retrieve the attributes of a coverage >> (e.g. >> long_name, units, _FillValue etc.)? Using the test files (e.g. >> "O3-NO2.nc", >> "wind.nc <http://wind.nc>") I tried feature.getProperties(), >> feature.getAttributes() - both >> provide only geometry and value - and coverage.getProperties() which >> is >> empty... >> Is there a way? >> >> >> The coverage API is an abstraction over the raw NetCDF layer. I do not >> know >> if these internal implementation details are accessible. Perhaps Daniele >> can >> confirm? >> >> As far as I remember, the underlying attributes aren't exposed as properties >> of >> the coverage. >> >> 2.) I have files containing longitude values from 335° to 404° (with >> CENTRAL_MERIDIAN at 360°) instead of -25° to 44° (in WGS84). There >> is no >> coordinate system information in the files. The NetCDF reader seams >> to >> convert >> all values greater than 360° but leaves the others unchanged. Hence, >> the >> resulting coverage has values from 44° to 335° which certainly isn't >> correct. >> Maybe I have to use the NetCDFProjection class but I couldn't find an >> example >> how to use it. What's the way to get the proper values? >> >> >> I do not think you should have to use a NetCDFProjection. What version of >> GeoTools are you using? There were some recent changes in the NetCDF-Java >> library affecting longitude handling but I think only in GRIB2 files. >> Excessive or inconsistent tampering with longitudes might be a bug in >> GeoTools. Do you have a sample file that you can share? >> >> 3.) How do I know all the values which I can or I have to use for >> GeneralParameterValue (despite the ones used in the test units)? >> Thank you in advance. >> Christiane >> >> >> Good question. Daniele? >> >> Do you mean the parameters supported by the reader? >> The supported (and exposed parameters) are listed by the related format >> class as . >> https://github.com/geotools/geotools/blob/master/modules/plugin/coverage-multidim/netcdf/src/main/java/org/geotools/coverage/io/netcdf/NetCDFFormat.java#L67 >> To double check, you may also take a look to the parameters parsing code: >> https://github.com/geotools/geotools/blob/master/modules/plugin/coverage-multidim/netcdf/src/main/java/org/geotools/coverage/io/netcdf/NetCDFReader.java#L525 >> Does it helps? >> Cheers, >> Daniele >> >> >> Kind regards, >> >> -- >> Ben Caradoc-Davies <b...@transient.nz <mailto:b...@transient.nz>> >> Director >> Transient Software Limited <http://transient.nz/> >> New Zealand >> >> -- >> == >> 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. >> > -- Ben Caradoc-Davies <b...@transient.nz> Director Transient Software Limited <http://transient.nz/> New Zealand ------------------------------------------------------------------------------ _______________________________________________ GeoTools-GT2-Users mailing list GeoTools-GT2-Users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/geotools-gt2-users
