IMHO, its important to store the actual projection. So the base coordinate
system is x,y in units (typically) of "km on the projection plane". hopefully
you are using a standard projection (eg polar stereographic), and then you use
some well-known way of specifying the projection, eg FGDC. knowing the
projection is necessary to allow full interoperability with GIS. This doesnt
cost much, just 2 1D coordinate variables.
In addition, you might want to encode the lat/lon positions of each grid point,
using the 2D coordinate axes as per section 5.2. This costs 2 2D variables in
storage, which may or may not be small compared to the size of the file.
I dont see anywhere in the CF that standardizes how to specify the
projection(?). I think its very important, perhaps it could be done for the next
version ?
Mark A Ohrenschall wrote:
> Hello,
>
> I'm wondering if I should follow section 5.2 of the CF Conventions in
> representing data that is in a polar stereographic projection. And at
> the risk of belaboring the obvious, are the two-dimensional coordinate
> variables respectively grids of latitude and longitude values for each
> grid cell in the poloar stereographic grid?
>
> Thanks,
>
> Mark
>
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Received on Wed Oct 09 2002 - 10:27:57 BST
