Error: Data either does not contain a valid latitude coordinate array or doesn't contain one at all

Hi,

I am now trying to modify some examples. I would like to obtain something
like the example on Mollweide projection
"proj_1.ncl<http://www.ncl.ucar.edu/Applications/Scripts/proj_1.ncl>
.

However, instead of temperature, I would like to have velocity u,v instead.
The color contour will be the magnitude of the velocity. So now I'm using
gsn_csm_vector_scalar_map instead.

Basically, what I have changed are:

  u = a->U(0,0,0:63:8,0:127:8) ; read velocity
  v = a->V(0,0,0:63:8,0:127:8)
  lat = a->lat
  lon = a->lon
  mag = sqrt(u^2+v^2) ;calculate magnitude

  contour = gsn_csm_vector_scalar_map(wks,u,v,mag,res) ; create the plot

There's some other changes but they are minor ones.

I keep getting the error:

(0) check_for_y_lat_coord: Warning: Data either does not contain a valid
latitude coordinate array or doesn't contain one at all.
(0) A valid latitude coordinate array should have a 'units' attribute
equal to one of the following values:
(0) 'degrees_north' 'degrees-north' 'degree_north' 'degrees north'
'degrees_N' 'Degrees_north' 'degree_N' 'degreeN' 'degreesN' 'deg north'
(0) check_for_lon_coord: Warning: Data either does not contain a valid
longitude coordinate array or doesn't contain one at all.

However, looking inside the atmos.nc file, there's clearly the lat and lon
variables. Can someone enlighten me?

Thanks alot!

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Received on Mon Dec 7 03:03:36 2009