Hi Christiane,
On Wed, Nov 9, 2016 at 10:19 PM, Ben Caradoc-Davies <b...@transient.nz>
wrote:
> On 03/11/16 11:18, 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") 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>
> Director
> Transient Software Limited <http://transient.nz/>
> New Zealand
>
--
==
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