Re: vector doesn't appear

Dear Ahmed,

Thanks for providing your script and data offline.

The fix is pretty simple. You had named the dimensions of "u" and "v" correctly, but you
need additional code to attach the coordinate arrays.

After this code:

u!0="for_time"
u!1="lat"
u!2 ="lon"
v!0="for_time"
v!1="lat"
v!2 ="lon"

Add this code:

;---Attach coordinate arrays to u and v
u&lat = lat
u&lon = lon
v&lat = lat
v&lon = lon

Furthermore, I noticed you are hard-coding your missing values:

u@_FillValue=9.96921e+36
v@_FillValue=9.96921e+36

If you are using NCL V6.0.0, then you can use the "default_fillvalue" function, which gives the same values:

u@_FillValue = default_missing("float")
v@_FillValue = default_missing("float")

--Mary

On Sep 16, 2011, at 8:27 AM, ahmed lasheen wrote:

> hello every body
> i am trying to plot the wind velocity for the wam model , but i have a problem in drawing them
> i have wind speed and wind direction and from them i calculate the u and v to draw them
> .
> i used the overlay function , gsn_csm_map and gsn_csm_vector
> the script and the grib file are attached in the email
> thanks in advance
>
> --
> ===============
> Ahmed Lasheen
> Junior researcher at Cairo Numerical Weather Prediction Center (CNWPC)
> Egyptian Meteorological Authority(EMA)
> Cairo,Egypt
> ===============
>

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Received on Fri Sep 16 15:43:18 2011