Hi John,
I agree with Jonathan, and would like to stress that a conforming CF file
must have the 2D auxiliary lat/lon coordinates; the grid_mapping
information is optional. Jonathan's suggestion of adding a time coordinate
to the lat/lon coordinates is the natural way to concatenate these time
slices.
There is no provision in CF-1.0 for time varying grid_mapping information.
That's a good use case to keep in mind moving to CF-2. Thanks for bringing
it up.
Brian
On Mon, Oct 09, 2006 at 07:28:22AM +0100, Jonathan Gregory wrote:
> Dear John
>
> > The projection is changing its parameters
> > from one run to the next
>
> The data variables should have 2D auxiliary lat and lon coordinates, pointed to
> by the coordinates attribute. Can you use these for plotting, slicing, etc.? If
> you want to put the data into one variable with a time dimension, for example,
> you could give the auxiliary lat and lon coordinates that dimension as well
> e.g. lon(time,y,x).
>
> However if you want to do this and still retain the grid_mapping information,
> we would need a way to represent a variable grid-mapping, by e.g. adding a time
> dimension to its attributes, or making them point to 1D variables.
>
> Cheers
>
> Jonathan
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Received on Mon Oct 09 2006 - 08:46:02 BST
