[ncl-talk] gsn_csm_vector_scalar_map

[Mary Haley]

Xi,

For an example of using gsn_csm_vector_scalar_map and changing the contour
levels, please see example "lcnative_5.ncl" at:

http://www.ncl.ucar.edu/Applications/lcnative.shtml#ex5

You will need to add the following lines to the code:

  res at cnLevelSelectionMode    = "ManualLevels"
  res at cnMinLevelValF          = 270
  res at cnMaxLevelValF          = 310
  res at cnLevelSpacingF         = 2

The data file can be downloaded from:

http://www.ncl.ucar.edu/Applications/Data/#grb

Note that this example also shows how to create this kind of plot using
gsn_csm_contour_map and gsn_csm_vector.  I sometimes recommend this method
if you want more control over the individual vector and contour plots.

--Mary


On Fri, Feb 5, 2016 at 1:19 PM, Xi Chang <xi.chang01 at gmail.com> wrote:

> Hi Karin,,
>
> I did, but it doesnt work for gsn_csm_vector_scalar_map, no idea why..
>
> Chang.
>
> On Fri, Feb 5, 2016 at 7:53 PM, Karin Meier-Fleischer <
> meier-fleischer at dkrz.de> wrote:
>
>> Hi Xi,
>>
>> have you taken a look at the first example of the vector examples page
>>     http://ncl.ucar.edu/Applications/Scripts/vector_1.ncl
>>
>> When you want to control the minimum/maximum and interval of the contour
>> lines use
>>
>>   res at cnLevelSelectionMode = "ManualLevels"     ; set manual contour levels
>>   res at cnMinLevelValF       = 24.0               ; set min contour level
>>   res at cnMaxLevelValF       = 29                 ; set max contour level
>>   res at cnLevelSpacingF      = 0.10               ; set contour spacing
>>
>> Bye,
>> Karin
>>
>> Am 05.02.16 um 19:00 schrieb Xi Chang:
>>
>> Hello...
>>
>> Could you please tell me how to control the contour interval for color
>> shading once im using this function  *gsn_csm_vector_scalar_map*.
>>
>> ;===========PLOT=================
>>
>>   wks = gsn_open_wks("png","overlay")
>>
>>   res                       = True              ; plot mods desired
>>   plot = new(16,graphic)
>>
>>   res at gsnDraw             = False           ; don't draw
>>   res at gsnFrame            = False           ; don't advance frame
>>
>> ; vector rescoures
>>   res at vcRefLengthF             = 0.045
>>   res at vcRefMagnitudeF          = 20.0
>>   res at vcRefAnnoOrthogonalPosF  = -0.12
>>   res at vcRefAnnoParallelPosF    =  0.997
>>   res at vcRefAnnoFontHeightF     = 0.015
>>   res at vcMinDistanceF          = 0.03
>>   res at lbLabelBarOn        = False
>>
>>   res at mpProjection   = "AzimuthalEquidistant"  ; choose map projection
>>   res at mpLimitMode    = "LatLon"          ; use lat/lon coordinates to
>> limit area
>>   res at mpMinLatF      = 25.
>>   res at mpMaxLatF      = 75.
>>   res at mpMinLonF      = -80.
>>   res at mpMaxLonF      = 20.
>>   res at gsnMaximize           = True
>>
>>
>>
>>
>>
>> *  res at gsnScalarContour        = True   res at cnFillOn                =
>> True   res at cnFillPalette           = "gui_default"     ; set color map
>> res at cnLinesOn               = False             ; turn off contour lines *
>>
>>
>>   do i=0,15
>>   plot(i)  = gsn_csm_vector_scalar_map(wks,u(i,:,:),v(i,:,:), \
>>                                    p(i,:,:),res)
>>   end do
>>
>>   resP                     = True                ; modify the panel plot
>>   resP at gsnMaximize           = True
>>   gsn_panel(wks,plot,(/4,4/),resP)               ; now draw as one plot
>>
>>
>> end
>>
>>
>>
>>
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