Dear all
Without reviewing the documents and making the comparison again, it's my
recollection that ugrid was more CF-like than gridspec. At that time (more
than three years ago) I made these notes:
http://www.met.rdg.ac.uk/~jonathan/CF_metadata/ugrid_gridspec.html
Best wishes
Jonathan
----- Forwarded message from Chris Barker <chris.barker at noaa.gov> -----
> Date: Thu, 10 Dec 2015 15:46:15 -0800
> From: Chris Barker <chris.barker at noaa.gov>
> To: Jonathan Gregory <j.m.gregory at reading.ac.uk>
> CC: "cf-metadata at cgd.ucar.edu" <cf-metadata at cgd.ucar.edu>
> Subject: Re: [CF-metadata] Reference for GRIDSPEC?
>
> On Thu, Dec 10, 2015 at 8:19 AM, Jonathan Gregory <j.m.gregory at reading.ac.uk
> > wrote:
>
> > After that proposal was agreed, we had some further discussions concerning
> > the
> > relationship of gridspec and ugrid and how they could be made more similar.
> >
>
> I remember that conversation, though I never took the time to look at
> gridspec.
>
> For reference, here is the current UGRID spec:
>
> https://github.com/ugrid-conventions/ugrid-conventions/blob/master/ugrid-conventions.md
>
> I just looked at:
>
> http://www.gfdl.noaa.gov/~vb/gridstd/gridstdse3.html#x5-240003.4
>
> And my first impression is that while it is handling the same information
> as UGRID, it's pretty different, at least with respect to variable names.
> My impression is thus:
>
> gridspec was developed to support a certain set of (structured) grids. The
> unstructured bit was then added to well-match the model and conventions
> that had been established.
>
> UGRID, n the other other hand was built from scratch, based on CF and the
> vocabulary and conventions that unstructured grid (oceanographic) modelers
> use. So it's a more wordy, but actually matched pretty well with what
> FVCOM, ADCIRC, SELFE, etc already put out.
>
> So: I don't think that we in the UGRID community are going to want to turn
> what we'be got on end to match gridspec. I suspect the gridspec community
> is in the same position. Thugh: how much is gridspec used for unstructured
> grids? If not much then maybe just drop that support, and use UGRID.
>
> HOWEVER: I haven't looked closely enough -- maybe the differences really
> are just vocabulary -- so maybe we could unify them if we allow multiple
> names for the same thing. i.e, in a triangular mesh grid, you specify
> either:
>
>
> var_name:cf_role = "face_node_connectivity" ;
>
> or
>
> var_name:standard_name = "neighbor_cell_index"
>
> though, honestly, gridspec doesn't look very CF-y to me anyway :-)
>
>
> -CHB
>
>
>
> --
>
> Christopher Barker, Ph.D.
> Oceanographer
>
> Emergency Response Division
> NOAA/NOS/OR&R (206) 526-6959 voice
> 7600 Sand Point Way NE (206) 526-6329 fax
> Seattle, WA 98115 (206) 526-6317 main reception
>
> Chris.Barker at noaa.gov
----- End forwarded message -----
Received on Fri Dec 11 2015 - 07:13:58 GMT
