[ecco-support] [EXTERNAL] grid_load.m

[Gael Forget]

Hi Hong

Thanks for taking a look. I am bit confused about the suggested modifications but maybe they aren’t actually needed and I don't want to introduce further delay. 

Why not just (1) make sure that `nctiles_grid/` in r3 and r4 is the same as in r2 to avoid disrupting returning users, (2) move the other `GRID*` stuff to a separate folder to avoid confusing new users, and (3) document in your READMEs the circumstances when each grid folder should be used? 

Ultimately it’s obviously up you guys at JPL to decide on what you want to do to resolve this situation. I am just worried we might be losing more users until JPL remedies the confusion that’s emerged from the reformatting. The added documentation in READMEs is probably needed regardless of anything else.

Hope this helps. 

Best,
Gael




> On May 3, 2020, at 7:44 PM, Zhang, Hong (US 398K) <hong.zhang at jpl.nasa.gov> wrote:
> 
> Hi Gael,
> I took a look. We need to modify
> grid_load.m and read_nctiles.m for r4.
> 
> "read_nctiles.m" needs two minor fixes
> 1) https://github.com/MITgcm/gcmfaces/blob/master/gcmfaces_IO/read_nctiles.m#L64
> basedir = './'; ==> basedir = '.';
> 2) https://github.com/MITgcm/gcmfaces/blob/master/gcmfaces_IO/read_nctiles.m#L190
>    t0=tt(1)-1; ==>     t0=tt(1);
> 
> It's hard to reconcile "GRID*.nc" from r3 and "ECCO-GRID*.nc" from r4
> in "grid_load.m" because they have different field names.
> One work-around is to copy 
> https://ecco.jpl.nasa.gov/drive/files/Version4/Release3/nctiles_grid/GRID.nc
> to
> https://ecco.jpl.nasa.gov/drive/files/Version4/Release4/nctiles_grid/
> 
> I did a test as above and it's OK.
> But it took ~204 seconds to load 312 monthly v4 ETAN from 312 files
> as opposed to 1.4 seconds to load 288 monthly v3 ETAN from 13 files.
> Perhaps this arrangement has more benefits to ECCO-v4.py
> 
> cheers
> Hong
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> ecco-support at mit.edu
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