plotting with Lambert Conformal grid

From: Jason J. Levit (jlevit AT XXXXXX)
Date: Tue Dec 11 2001 - 09:39:43 MST


  Hi all,

  I'm attempting to use the following function in NCL:

  "gsn_csm_vector_scalar_map", and plot using a Lambert Conformal
grid. I've defined all the necessary variables:

  cnres@mpProjection="LambertConformal"
  cnres@mpLambertParallel1F=ltrulat1
  cnres@mpLambertParallel2F=ltrulat2
  cnres@mpLambertMeridianF=ltrulon

  cnres@mpLimitMode = "Corners"
  cnres@mpLeftCornerLonF = swlons
  cnres@mpLeftCornerLatF = swlats
  cnres@mpRightCornerLonF = nelons
  cnres@mpRightCornerLatF = nelats
 
  However, when I plot, I see the following error message:

(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) check_for_lon_coord: Warning: Data either does not contain a
 valid longitude coordinate array or doesn't contain one at all.

  When I checked this error out on the web page, I had the sense that
I need to provide coordinate data for my data. However, the coordinate
data is not 1D, since I'm using a Lambert Conformal grid - the lat/lon
arrays are 2D (the values vary in space). Therefore, when I assign
the lat/lon arrays to the coordinate arrays, the program blows up.

  I'm confused. Why am I receiving the above error when I've defined
all the correct values?

  Thanks for any help!

  Jason Levit

-- 
------------------------------------------------------------------------
Jason J. Levit, N9MLA                   Research Scientist,
jlevit AT ou.edu             Center for Analysis and Prediction of Storms
Room 1022                              University of Oklahoma
405/325-3503                           http://www.caps.ou.edu/



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