Re: [netcdfgroup] storing sparse matrices data in NetCDF

  • To: "Schmunk\, Robert B. \(GISS-611.0\)\[SciSpace LLC\]" <robert.b.schmunk@xxxxxxxx>
  • Subject: Re: [netcdfgroup] storing sparse matrices data in NetCDF
  • From: Ken Mankoff <mankoff@xxxxxxxxx>
  • Date: Mon, 25 Mar 2019 08:17:51 -0700
Hi Robert!

I hope all is well at GISS.

On 2019-03-18 at 20:30 -0700, Schmunk, Robert B. (GISS-611.0)[SciSpace LLC] 
<robert.b.schmunk@xxxxxxxx> wrote...
> Pursuant to Dave’s suggestion, check out the CF convention for netCDF
> metadata. In particular see section 9 on discrete sampling geometries,
> and its discussion of the timeSeries featureType at multiple
> locations.
>
> Appendix H.2.1 shows example CDL notation for an case that sounds
> fairly similar to what you are looking for.

Yes, I had found that and am modeling my data format after H2.1:

http://cfconventions.org/cf-conventions/cf-conventions.html#_orthogonal_multidimensional_array_representation_of_time_series

But I have a Panoply-specific question related to this data. When open the file 
I'm creating in Panoply, runoff variable type is "2D" and dimension are "cat" 
and "time", and the Panoply-displayed info is:

double runoff(time=365, cat=31240);
  :units = "m3 s-1";
  :long_name = "RACMO runoff";
  :standard_name = "water_volume_transport_in_river_channel";
  :description = "..."
  :_ChunkSizes = 1U, 31240U; // uint

I'd like to also be able to plot data on (lon,lat). If I add

  :coordinates = "lon lat"

then the data is "Geo2D", but I can only make a "longitude-time" georeferenced 
plot (and again cat v. time 2D plot). I've been trying and searching for what 
attributes I need to add to help your software display the results on a 
(lon,lat) grid/map. Can you offer any suggestions?

Thanks,

 -k.



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