Date: Mon, 29 Oct 2007 15:11:09 -0600
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
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