Re: [ferret_users] Trying to visualize data on cubed-sphere grid

[Steve Hankin <steven.c.hankin@xxxxxxxx>]

Gary,

Ferret expects the CF auxiliary coordinates to be on the same 2D horizontal coordinate system as the data variables.   Have a look at using the RESHAPE function to wrap the 1D coordinate arrays onto a 2D coordinate system.
http://ferret.pmel.noaa.gov/Ferret/documentation/users-guide/variables-xpressions/XPRESSIONS#_VPINDEXENTRY_335

    - Steve

On 4/6/2013 7:27 AM, Gary Strand wrote:

I'm playing around with some data that's on a cubed-sphere grid, and am wondering if the description of the grid is causing the usual "Y coord field lies in different plane from data to be plotted" error when using the "shade ts,lon,lat" command.

The data of interest and the longitudes and latitudes are all described as one-dimensional vectors, i.e., a 1-D array of N points:

yes? use test.nc 
yes? show data
     currently SET data sets:
    1> ./test.nc  (default)
 name     title                             I         J         K         L         M         N
 TS       Surface temperature (radiative)  1:777602  ...       ...       1:1       ...       ...
 LAT      latitude                         1:777602  ...       ...       ...       ...       ...
 LON      longitude                        1:777602  ...       ...       ...       ...       …

and 'ncdump -h' shows:

prompt> ncdump -h test.nc | egrep "(lon|lat|TS)"

        float TS(time, ncol) ;

                TS:units = "K" ;

                TS:long_name = "Surface temperature (radiative)" ;

                TS:cell_methods = "time: mean" ;

        double lat(ncol) ;

                lat:long_name = "latitude" ;

                lat:units = "degrees_north" ;

                lat:axis = "Y" ;

        double lon(ncol) ;

                lon:long_name = "longitude" ;

                lon:units = "degrees_east" ;

                lon:axis = "X" ;

Giving lon and lat the appropriate "axis" attributes doesn't change anything about how FERRET sees the data.

Any suggestions appreciated!

Gary Strand
strandwg@xxxxxxxx