Dear David:

Yes, that will work. Thanks for pointing that out to me.

Is this enhancement going to make it into 1.7 ?   I took a look at the 1.7 
draft, and it is not in there yet.

very respectfully,

randy

----------------------------------------
From: "David Hassell" <[email protected]>
Sent: Friday, December 20, 2013 4:17 AM
To: "Randy Horne" <[email protected]>
Cc: "[email protected]" <[email protected]>
Subject: Re: [CF-metadata] one data variable is associated with two grid 
mappings

Dear Randy,

Will the method accepted in ticket 70
(https://cf-pcmdi.llnl.gov/trac/ticket/70) work for you?

  "The expanded form of the grid_mapping attribute is required if one
   wants to store coordinate information for more than one coordinate
   reference system"

Something like this, perhaps:

  float data_var
    data_var:grid_mapping = "latitude-longitude: <associated coordinates> 
geostationary: <associated coordinates>"

  char latitude-longitude   // grid mapping

  char geostationary   // grid mapping

All the best,

David

---- Original message from Randy Horne (09PM 19 Dec 13)

> From: Randy Horne <[email protected]>
> Date: Thu, 19 Dec 2013 21:26:20 -0500
> To: "[email protected]" <[email protected]>
> X-Mailer: Apple Mail (2.1510)
> Subject: [CF-metadata] one data variable is associated with two grid
>  mappings
> 
> Folks:
> 
> We have a product with a data variable containing 10 degree latitude band 
statistics (i.e. min, max) derived from observation data whose east/west 
extents are associated with the field of view of a geostationary satellite 
(i.e. the recently defined geostationary grid mapping / projection).
> 
> The implication is that this data variable is associated with two 
different grid mappings (latitude-longitude & geostationary).  Workarounds 
to represent the east/west grid boundaries on the latitude-longitude grid 
mapping are unappealing due to the different geometries associated with the 
two projections.
> 
> Thoughts ?
> 
> 
> very respectfully,
> 
> randy
> _______________________________________________
> CF-metadata mailing list
> [email protected]
> http://mailman.cgd.ucar.edu/mailman/listinfo/cf-metadata

--
David Hassell
National Centre for Atmospheric Science (NCAS)
Department of Meteorology, University of Reading,
Earley Gate, PO Box 243,
Reading RG6 6BB, U.K.

Tel   : +44 118 3785613
E-mail: [email protected]


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