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NOTICE: This version of the NSF Unidata web site (archive.unidata.ucar.edu) is no longer being updated.
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What netCDF version do you use in you FileWriter.createNew? I'm able to make CF files for point features readable by toolsUI, but I restrict myself to NetcdfFileWriter.Version.netcdf3? Roland On Fri, Jan 24, 2014 at 7:55 AM, Aleksander Vines <aleksander.vines@xxxxxxxx > wrote: > Hi, > > I need some help with the creation of a NetCDF file. > > I'm attempting to create the NetCDF file programmatically. I have a lot of > point data, and I want to be able to create different types of NetCDF-files > after extracting different subsets of these points. I want the files to > conform to CF-1.6 (as far as its possible with the input I got). > > I'm using NetCDF-java 4.3. > > I've found a "Short guide to writing files using CF-1.6 Discrete Sampling > Features Conventions": > > - > > http://www.unidata.ucar.edu/software/thredds/current/netcdf-java/reference/FeatureDatasets/CFpointImplement.html > > From this guide, I concluded that I should support the format specified in > CF-1.6 H5.3 (see below) in my application (I'm also writing other kind of > formats) > > - > > http://cf-pcmdi.llnl.gov/documents/cf-conventions/1.6/cf-conventions.html#idp8432528 > - I've figured one obvious error in this example, and that is that > they referred to name_strlen as a dimension without specifying it in the > dimension list. > > ncdump of the file I've created: > > - http://pastebin.com/fsPGX5LD > - I've changed station_info to a 2D char array (as far as I > understand, this is just some extra info and it shouldn't make a difference > that I changed it to be a char/String(2D)?) > - I miss a few long_names, and a few standard names are not the > "correct" standard names, but I can't figure out why this is not working. > > All seems nice so far, but when I try to read this netCDF-file with > ToolsUI 4.3, I get this error message: http://i.stack.imgur.com/kmAqR.png > > - Can't open x.nc > - NestedTable: cant find variable time for coordinate type Time > - NestedTable: cant find variable lat for coordinate type Lat > - NestedTable: cant find variable lon for coordinate type Lon > - Table Structure(record) featureType POINT: lat/lon/time coord not > found > - Failed to find FeatureDatasetFactory for=x.nc datatype=ANY_POINT > > Could the problem have something to do with the following comment in > the "Short guide to writing files using CF-1.6 Discrete Sampling Features > Conventions", under 9.5: "CDM: A variable representing the instance id is > required, indicated by an attribute named cf_role, which follows all the > CF rules above." > > It is absolutely not a requirement that the file is read by ToolsUI 4.3, > but the fact that it can't be read from there probably indicates that > something is wrong with the format (ncWMS can't read the file either). > > I'm not sure if it makes any difference to show the code here, but here is > the method that writes to the netCDF file: http://pastebin.com/QTHKUyw8 (and > yes, I know NetcdfFileWriteable is deprecated, but in my opinion, your > documentation is quite difficult to use, and the "latest" examples ( > https://www.unidata.ucar.edu/software/thredds/current/netcdf-java/tutorial/ > http://www.unidata.ucar.edu/software/netcdf/examples/programs/ ) seems > to be using this class) > > Any help with this problem would be greatly appreciated :) > > Many Thanks, > Aleksander Vines > > _______________________________________________ > 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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