Re: gsn_contour_shade question

Hi Marc,
gsn_contour_shade was written to replace 4 older functions:
ShadeLeContour, ShadeGeContour, ShadeGeLeContour, and ShadeLeGeContour.
None of those four functions allowed one to fill the middle at all, so I
am guessing I just didn't think of adding the ability to shade the
middle and top/bottom as an option.

Mary, I'd recommend that your gsn_shade_contour_mod code becomes the new
gsn_shade_contour coding upon the next release of NCL..
Adam

On 07/23/2013 10:43 PM, Mary Haley wrote:
> Hi Marc,
>
> I'm not familiar with the gsn_shade_contour code, so I took a quick look at it.
>
> It does appear that if you set gsnShadeMid, then you can't set either gsnShadeLow or gsnShadeHigh. In fact, I think the only case where you can set more than one of these is gsnShadeLow and gsnShadeHigh.
>
> I'm sure there must be a reason why it is coded this way, and hopefully Adam can chime in.
>
> Meanwhile, I created a modified version of gsn_shade_contour ("gsn_shade_contour_mod") that does what I think you want.
>
> I modified your example slightly to show different combinations of setting the three Shade resources. See the attached image and script.
>
> --Mary
>
>
> On Jul 23, 2013, at 5:11 PM, Marc Michelsen <marc@u.washington.edu> wrote:
>
>> Hi NCLers,
>>
>> Are you supposed to be able to set gsnShadeLow and gsnShadeMid in the same gsn_contour_shade call?
>> Here's a stripped down version of contour effects example 13:
>>
>> 803 challenger% cat coneff_13.ncl
>> load "$NCARG_ROOT/lib/ncarg/nclscripts/csm/gsn_code.ncl"
>> load "$NCARG_ROOT/lib/ncarg/nclscripts/csm/gsn_csm.ncl"
>>
>> begin
>> f = addfile ("uvt.nc", "r") ; add file
>> lat = f->lat ; get latitude
>> ind14S= ind(lat.eq.-1.395307) ; subscript index of 1.4S
>> u = f->U(0,:,ind14S,:) ; get u at 1.4S
>>
>> wks = gsn_open_wks ("ps", "coneff" )
>> res = True
>> res@cnLevelSpacingF = 5.0
>> res@gsnDraw = False ; We're going to panel later, so don't
>> res@gsnFrame = False ; draw or advance frame.
>> plot = gsn_csm_pres_hgt(wks, u, res )
>> opt = True
>> opt@gsnShadeLow = "red"
>> ; opt@gsnShadeMid = "yellow"
>> opt@gsnShadeHigh = "yellow"
>> plot = gsn_contour_shade(plot, -10.,-5, opt)
>> draw(plot)
>> end
>> 804 challenger%
>>
>> and it produces this plot:
>> <jjhddgba.png>
>>
>>
>> so I would like the current white area to be yellow and the current yellow area to be white
>> so I make the follow change (i.e. I use gsnShadeMid rather than gsnShadeHigh)
>>
>> opt@gsnShadeLow = "red"
>> opt@gsnShadeMid = "yellow"
>> ; opt@gsnShadeHigh = "yellow"
>>
>> and this is what I get:
>> <cbibgbdi.png>
>> No filled colors, no errors or warning messages.
>> I'm using NCL v 6.1.2
>> Am I doing something wrong? is this supposed to work?
>> Thanks,
>>
>> Marc
>>
>>
>>
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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