Re: Plotting CBOFS Data with NCL

Hi Brandon,
I am attaching a revised version of your script that properly projects your data onto a map and orients the data correctly. There is still "blotchiness" at the edges, but I am sure that is a result of the way the model produced the data. I put a second frame that cleans it up a bit by turning values of "speed" that equal 0 into missing values.

The staggered u and v grids are also a result of the model. Technically you would need to interpolate the u data values to the v grid or vice versa, but since the grid is pretty high resolution, it would probably not make a visible difference for plotting purposes.

Things to notice: I substituted gsn_csm_contour_map for your call to gsn_csm_contour. All the map resources are set for the map plot and not for the vector plot which is overlaid on the map.
Hope this helps get you on your way.
 -dave

On Jun 22, 2012, at 7:43 AM, Brandon Capasso wrote:

> Greetings,
>
> I have little knowledge of NCL, but I just started learning earlier this week due to limitations in grads. I've been trying to plot CBOFS data which is netcdf and on an orthogonal curvilinear grid, but I can't retain the correct shape of the grid when plotting (see attached script and resulting plot).
>
> the variables im trying to plot with contours and vectors are u and v components of current, and are 2 dimensional arrays with dimensions eta_u, xi_u and eta_v, xi_v respectively. the variables lat_u, lon_u, lat_v, lon_v are also available and are in 2 dimensions.
>
> u and v have slightly different dimensions for some reason; u is 291 x 330 and the v is 290 x 331, which is why im forcing them to conform in the first few lines of the script.
>
> I understand that the script is a mess; trial and error is part of the learning process. Mainly, I just want to know the best approach at plotting the data without it being distorted...you may notice in the attached image that the entrance to the chesapeake is facing north/south...when in reality it faces east! I'm clearly missing something here.
>
> Also, I tried using rcm2rgrid but the image comes out much more distorted and unrecognizable with blotches and horizontal/vertical lines.
>
> Any insight or guidance in the right direction would be greatly appreciated here!
>
> Regards,
>
> Brandon Capasso
>
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Received on Fri Jun 22 14:01:45 2012