Question about CDM

[Pauline Mak]

Hi all,

Thanks for the help - through the second validator, I think I've found out
what's wrong with the dataset.  Some of the axis doesn't have any values
under the regular column.  I've written a little Java app that goes through
a directory and find all nc files and checks that  a) it opens up as a
GriddedDataset and then 2) the GridCoordSystem from the GriddedDataset
isRegularSpatial().  Is this what it means by the WCS standard that it has
to be gridded and regularly spaced?

Thanks,

-Pauline.

On 4/21/07, Ethan Davis <edavis at unidata.ucar.edu> wrote:
>
> Hi Pauline,
>
> Another resource for validating datasets against the CDM is available at
>
> http://motherlode.ucar.edu:8080/thredds/cdmValidate.html
>
> And I believe it is distributed with all TDS installations, so you could
> try it locally at http://yourserver:port/thredds/cdmValidate.html
>
> Which datasets can be served by the TDS depends on the service over
> which you want to make them available. The HTTP bulk file download
> service (/thredds/fileServer/) can serve any file. The OPeNDAP service
> (/thredds/dodsC/) can serve any dataset that the netCDF-java library can
> read (the file types that can be read are listed on the home page,
> http://www.unidata.ucar.edu/software/netcdf-java/). The WCS service
> currently only handles gridded data. The key here is that they have to
> be recognized as gridded datasets by the netCDF-java library. The
> library can recognize gridded data and the coordinates in the data using
> a few different conventions. As Tom and/or Roy mentioned, CF is the
> convention we recommend. The CDM validator above should give you more
> clues on how well you dataset validates.
>
> Hope that helps.
>
> Ethan
>
> Pauline Mak wrote:
> > Hi all,
> >
> > I'm currently setting up a THREDDS server to server our datasets.  The
> > setup was fairly easy!  However, I'm running into problems with NetCDF
> > files which doesn't conform to the "Common Data (Access) Model" - we
> > want to serve all of our data through WCS (which comes for free with
> > THREDDS data server!).  I've searched high and low for documentation
> > on how to 'correct'  incompatible files. but failed to come up with
> > anything.  Am I missing something? Should all NetCDF files "just work"
> > with the NetCDF-Java 2.2 library?  I'm aware that files should be
> > gridded and regular.  Am I understanding correctly that gridded means
> > the files should have an x and y axis with optional z and t?   Is
> > there a nice method to find out if a file is compatible and if it's
> > not compatible, why it is so?
> >
> > My understanding of NetCDF file is rather shallow... so please bear
> > with me if I'm asking a simple question...
> >
> > Thanks & cheers,
> >
> > -Pauline.
> >
> > --
> > Pauline Mak
> > Software Developer, Insight4
> > Suite 2 / Level 1, 114 Murray St.
> > Hobart, Australia 7000
> > p:  (03) 6234 5203
> > f:  (03) 6234 5603
> > pauline at insight4.com <mailto:pauline at insight4.com>
>
> --
> Ethan R. Davis                                Telephone: (303) 497-8155
> Software Engineer                             Fax:       (303) 497-8690
> UCAR Unidata Program Center                   E-mail:    edavis at ucar.edu
> P.O. Box 3000
> Boulder, CO  80307-3000                       http://www.unidata.ucar.edu/
>
> ---------------------------------------------------------------------------
>
>
>


-- 
-- 
Pauline Mak
Software Developer, Insight4
Suite 2 / Level 1, 114 Murray St.
Hobart, Australia 7000
p:  (03) 6234 5203
f:  (03) 6234 5603
pauline at insight4.com