Question about CDM

[John Caron]

Pauline Mak wrote:
> 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?

yes. 
I think WCS 1.1 relaxes the regular spacing need, which will implement later this year (probably).


> 
> Thanks,
> 
> -Pauline.
> 
> On 4/21/07, *Ethan Davis* <edavis at unidata.ucar.edu 
> <mailto: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
>     <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>
>     <mailto: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 <mailto: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 <mailto:pauline at insight4.com>

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