Re: Plotting Contours on Contours

Hi,

I would add that if you uncomment the resT@gsnDraw/resT@gsnFrame lat around lines 103-104, then you get one plot that, as I understand it, is correct. You still get the warnings regarding the map-resources, but that's because, as Adam points out, the overlay plot is-not/should-not be a map plot. You could remove those resources for the 1st plot.

Rick

On Dec 3, 2013, at 11:07 AM, Adam Phillips <asphilli@ucar.edu> wrote:

> Hi Ioannis,
> You cannot use a *_map* plotting function to create the 2nd plotting object going into overlay. If a map is desired it should be the first object passed into overlay.
>
> A simple example:
> res = True
> res@gsnDraw = False
> res@gsnFrame = False
> res@mpMinLatF = 30.
> ....
> plot1 = gsn_csm_contour_map(wks,data,res)
>
> res2 = True
> res2@gsnDraw = False
> res2@gsnFrame = False
> res2@cnLevelSelectionMode = "ExplicitLevels"
> res2@cnLevels = (/95.,99./)
> ....
> plot2 = gsn_csm_contour(wks,sigdata,res2)
> overlay(plot1,plot2)
> draw(plot1)
> frame(wks)
>
> Hope that helps..
> Adam
>
> On 12/03/2013 05:22 AM, Ioannis Koletsis wrote:
>> Dear ncl users,
>> I would like to plot temperature difference between 1000-850 hPa, and over this plot the mslp chart using the attaced script (plot_temp.ncl).
>> Running the script the following error messages have been appeared
>>
>> warning:mpProjection is not a valid resource in Plot_contour at this time
>> warning:mpMinLonF is not a valid resource in Plot_contour at this time
>> warning:mpMaxLonF is not a valid resource in Plot_contour at this time
>> warning:mpMinLatF is not a valid resource in Plot_contour at this time
>> warning:mpMaxLatF is not a valid resource in Plot_contour at this time
>> warning:mpFillOn is not a valid resource in Plot_contour at this time
>> warning:mpDataBaseVersion is not a valid resource in Plot_contour at this time
>> warning:mpDataSetName is not a valid resource in Plot_contour at this time
>> warning:mpOutlineBoundarySets is not a valid resource in Plot_contour at this time
>> warning:mpGeophysicalLineThicknessF is not a valid resource in Plot_contour at this time
>>
>> Moreover, two plots are created, but only the second plot is right (attached png files)….
>>
>> When I changed the 84th line of the script, I had got the error message
>> fatal:NhlAddOverlay: plot class mapPlotClass cannot be overlay plot member
>> I have already read the given examples at ncl web pages, but I couldn’t find any solution….
>>
>> Have you got any idea????
>>
>> Thanks in advance
>>
>> Ioannis
>>
>>
>>
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>
> --
> ______________________________________________________________
> Adam Phillips asphilli@ucar.edu
> NCAR/Climate and Global Dynamics Division (303) 497-1726
> P.O. Box 3000
> Boulder, CO 80307-3000 http://www.cgd.ucar.edu/cas/asphilli
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Received on Tue Dec 3 11:13:00 2013