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
>
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