Re: mpMinLonF and problem with longitude labels

Hi Dave,

There are two ways to generate map tickmarks, and the default way
(which you are using) is the older way.

Try the "newer" way by setting:

   res_at_pmTickMarkDisplayMode = "Always"

I should deprecate the older method for this very reason.

Thanks,

--Mary

On Oct 29, 2007, at 3:11 PM, Dave Allured wrote:

> I am making a map that straddles 180 West, with longitudes set by
> mpMinLonF and mpMaxLonF. I found that longitude labels in the
> eastern hemisphere are incorrect if mpMinLonF is specified less
> than -180.
>
> Please see the attached demo script and plot. Note that on the
> first plot, the two leftmost labels on the X axis are 240W and
> 210W, when I think they should be 120E and 150E. I fixed this by
> changing my longitude limits from (-240, 0) to (120, 360).
>
> The documentation says that mpMinLonF and mpMaxLonF may range
> anywhere from -540 to 540. May I request that this labeling
> inconsistency be corrected in a future NCL release? Thank you.
>
> --Dave A.
> CU/CIRES Climate Diagnostics Center (CDC)
> NOAA/ESRL/PSD, Climate Analysis Branch (CAB)
> http://www.cdc.noaa.gov/
> ; 2007-oct-29 Test program for axis labelling problem.
> ; On the first plot, longitude labels
> ; west of -180 have the wrong hemisphere.
>
> load "$NCARG_ROOT/lib/ncarg/nclscripts/csm/gsn_code.ncl"
> load "$NCARG_ROOT/lib/ncarg/nclscripts/csm/gsn_csm.ncl"
>
> begin
> wks = gsn_open_wks ("x11", "out") ; open workstation
> plot = new (2, graphic) ; create array of plots
>
> res = True ; setup for first plot
> res_at_gsnDraw = False
> res_at_gsnFrame = False
> res_at_tmXBLabelFontHeightF = 0.014
> res_at_tmYLLabelFontHeightF = 0.014
>
> res_at_mpMinLatF = -40
> res_at_mpMaxLatF = 40
> res_at_mpMinLonF = -240 ; incorrect axis labels
> res_at_mpMaxLonF = 0
> res_at_mpCenterLonF = (res_at_mpMinLonF + res_at_mpMaxLonF) / 2
>
> res2 = res ; setup for second plot
> res2_at_mpMinLonF = 120 ; correct axis labels
> res2_at_mpMaxLonF = 360
> res2_at_mpCenterLonF = (res2_at_mpMinLonF + res2_at_mpMaxLonF) / 2
>
> plot(0) = gsn_csm_map_ce (wks, res)
> plot(1) = gsn_csm_map_ce (wks, res2)
> gsn_panel (wks, plot, (/2,1/), False) ; draw both plots
> end
> <out.gif>
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Received on Mon Oct 29 2007 - 15:30:12 MDT