Problem with GridDataset

[John Caron]

ncdump will dump any valid netcdf file.

A GridDataset must have a coordinate system recognized by the Netcdf Java library, for example, by being a valid CF or COARDS file. This can be a subtle problem to diagnose, it can depend on global attributes, etc. Did the original file have Grids in it?

You could try running it through here:

  http://motherlode.ucar.edu:8080/thredds/cdmValidate.html

and see if the results are helpful.

Or look at it in the ToolsUI program (coordinate system Tab) and see what the INFO button tells you.

 http://www.unidata.ucar.edu/content/software/netcdf-java/v2.2/webstart/index.html0

Brian Etheridge wrote:
> Hi,
> I am using the NetCDF data format and utility library 
> (netcdfUI-2.2.16.jar) to transfer weather data across the web and to 
> render a weather map image in a web page.  I have an application which 
> can render the data correctly, however, certain data extracts are 
> failing when I try to use a*** ucar.nc2.dataset.grid.GridDataset. * 
> Here's the code:
> 
> NetcdfDataset nc = NetcdfDataset.openDataset(location);
> GridDataset gd = new GridDataset(nc);
> Iterator it = gd.getGrids().iterator();
> while (it.hasNext()) {                 
>         GeoGrid gg = (GeoGrid)it.next();
>         etc…
> }
> 
> The problem is that there are are no GeoGrids available in the 
> GridDataset, so the code does go into the iteration, and there should be.
> 
> This problem could be the result of the way I am constructing the NetCDF 
> file because there is a complex subset and reduction mechanism being 
> used to extract a portion of the original NetCDF data provided by the UK 
> Meteorological Office.  Thus, I am quite confident that the original 
> NetCDF file is correct.
> 
> I am able to render the NetCDF data in both ncdump and ncbrowse and it 
> looks ok.
> 
> What could be missing in the NetCDF file which would allow it to look ok 
> in ncdump and ncbrowse but that would prevent GeoGrids being produced 
> from a GridDataset of the same data?
> 
> Any assistance most gratefully received.
> 
> Thanks
> Brian
> 

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