Re: how to get the same Y-axis for contour, vector, and xy plots on same frame

Hi TJ,

I'm not exactly sure what you are asking for. It would be easier if
you could provide a script and some data so I can see what you have so
far.

You can email me offline with this information, if you're able
to provide it.

Thanks,

--Mary

On Sat, 16 May 2009, TJ wrote:

> Hello,
>
> I am trying to create a sort of meteogram-type plot where the x-axis
> is time and the y-axis is altitude.
>
> I am having trouble getting an xy plot of lcl X time use the same scale for the
> Y axis as the vector plot of Wind X Time and the contour plot of local lapse
> rate X Time.
>
> How do I ensure that the plot of lcl will be using the same y-axis
> pressure/height levels as the other two??? Should I be using overlay?
>
>
> All varibles being plotted are from wrfout data files. The two gridded
> variables share the same bottom_top dimension and the same Time dimesnion. The
> lcl variable is one dimensional in time but its units are the same units as the
> Y-azis, ( I've tried both pressure and z.)
>
> I have successfully gotten stacked windbarbs over time and a background
> coloring showing the local lapse rate at each pressure level over time.
> However, when I tried to also plot a marker for lcl at each time, I got
> something that looked right, but upon checking the data, was not
> plotting on the same pressure levels as the other two plots. This became
> abundantly clear when the plot top was changed for the windgram and the lapse.
> The lcl plot is then plotted at the same NDC coordinates as it was before even
> though its position relative to the other variables has changed dramatically.
>
>
>
> I tried using
>
> cld_res_at_trYAxisType = "LinearAxis"
> cld_res_at_trYMaxF =maxp ; max(press(:,0,locY,locX))/100
> cld_res_at_trYMinF = minp ;min(press(:,ptop-1,locY,locX))/100
>
> Which improves things somewhat, but still doesn't yield an LCL plot in the same
> relative position to the windgrams and local lapse rate when the top of the plot
> changes.
>
> The three plots are
> wind_gram = gsn_vector(wks,ugrid,vgrid,uv_res) ;ugrid and vgrid are the usual
> x and y wind components as per
> http://www.ncl.ucar.edu/Applications/Scripts/meteo_1.ncl
>
> lapserate=gsn_csm_contour(wks,lgrid,lapse_res) ; lgrid
> is the "local" lapse rate on the same grid as above
> and
> cb_plot = gsn_y(wks,lcl,cld_res) ;lcl is
> an array of calculated lcl's by time.
>
> draw(lapserate)
> draw(cb_plot)
> draw(wind_gram)
> frame(wks)
>
>
> How do I ensure that the plot of lcl will be using the same y-axis
> pressure/height levels as the other two??? Should I be using overlay?
>
> Using overlay always comes back with a wrong type can't coerce error.
>
>
> Examples of the plots being produced
> http://home.comcast.net/~wxtofly/windgrams.html
>
>
> Thanks in advance,
> TJ Olney
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Received on Wed May 20 2009 - 16:57:03 MDT