Inline comments:
Chris Barker writes:
> 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.
Yes, this is quite correct.
>
> 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 :-)
Clearly I wouldn't agree, though I take no offence to your comment:-).
It tried very hard to hew to CF and netCDF3.
Also, neither I nor any of the original proponents are actively
developing gridspec at this point. I am happy to support further
development along the ugrid lines, and treat gridspec's ugrid as a
historical oddity... the Betamax of unstructured grid specification.
>
>
> -CHB
>
>
>
>
--
V. Balaji Office: +1-609-452-6516
Head, Modeling Systems Group, GFDL Home: +1-212-643-2089
Princeton University Email: balaji at princeton.edu
Received on Fri Dec 18 2015 - 11:47:34 GMT
