Re: contour plots

Hi Marston,

ncl puts the tickmarks in the center of the cells you are plotting. I
think that's the default behavior. If you want the tickmarks to be
between the cells you need to manually shift the tickmark label
locations by 0.5.

The grids look uneven now, because only half the cells at the bottom and
on the left are shown in the plot. If you move the tickmark values that
should fix it. I used

res@tmYLMode = "Explicit"
   res@tmYLValues = ispan(1980,2010,5)-0.5
   res@tmYLLabels = ispan(1980,2010,5)
   res@tmYLMinorValues = years-0.5

for an array that had years as the left-most dimension.

Hope this helps,
Maria

On 11/14/2013 05:09 AM, Marston Johnston wrote:
> Hi Caspar,
>
> I've plotted the fig again and this time with the same x-axis length.
> It looks like the contour squares crossed the cell boundaries, which
> is ok, but they end in the middle of a cell, that to me seems strange.
> Do you see this happening in the fig attached?
> I've tried using "cellfill" instead of "rasterfill" and the cell fill
> shows cells smaller than the bins. Strange?
>
> /M
>
>
> On Thu, Nov 14, 2013 at 12:53 PM, Caspar Ammann <ammann@ucar.edu
> <mailto:ammann@ucar.edu>> wrote:
>
> I think if you set the x-axis the same for all plots, you might
> see that the ticks are treated equally in all plots. The only
> difference I see in your image is between the top row and the ones
> below, but looking more closely: all of the grids line up with the
> bins just fine, there are just many more bins in the top figures.
>
> Caspar Ammann
> National Center for Atmospheric Research
> RAL - Climate Science and Applications Program
>
> On Nov 14, 2013, at 4:32 AM, Marston Johnston <shejo284@gmail.com
> <mailto:shejo284@gmail.com>> wrote:
>
> > Hi,
> >
> > I have an array that is time vs rain rates and the cell size of
> this array is 1 x 1, i.e., the
> > time axis runs from 0 to 24 at every hour and the rain rates
> axis runs from 0 to 60 at every 1 mm/hr. When I plot this array
> with gsn_csm_contour I get pixels that do not match up with the
> bins size (ticks on the axis), giving the impression that the
> contour plots using shifted bins or something like that.
> >
> > I've attached the image. I would appreciate some help in
> understanding what NCL is doing.
> >
> > Sincerely,
> > /M
> > <diurnal_dc.pdf>_______________________________________________
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>
>
>
> --
> Only the fruitful thing is true!
>
>
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-- 
Maria Gehne
Postdoctoral Fellow
NCAR/CGD/CAS
P.O. Box 3000
Boulder, CO 80307

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Received on Thu Nov 14 08:17:53 2013