[ncl-talk] changing tick marks

[Mary Haley]

Hi Michael,

Part of the problem is that you've set the minimum of your X axis (the
longitude axis to 0):

res at trXMinF                 = 0                    ; set minimum X-axis
value
res at trXMaxF                = 30                    ; set maximum X-axis
value

This is causing your longitudes to only go from 0 to 30, and hence you are
not going to see any labels or tickmarks at negative longitude values.

I suggest not setting the tr*M**F resources at all, unless you need to zoom
in on the plot for some reason.

Also, if you are indeed plotting lat/lon data, you should be calling
"gsn_csm_contour_map" and not "gsn_csm_contour".  The former will put draw
contours over a map, whereas the latter only draws a contour plot. For
examples of using gsn_csm_contour_map, see:

http://www.ncl.ucar.edu/Applications/cylineq.shtml

Note that some of these examples are using "gsn_csm_contour_map_ce", which
is the same thing.  gsn_csm_contour_map will draw a cylindrical equidistant
map plot by default, unless you change the map projection.

--Mary



On Sat, Jul 26, 2014 at 7:44 AM, Hemming, Michael <
michael.hemming at mpimet.mpg.de> wrote:

>  Hey everyone,
>
> I am having trouble understanding how to alter tickmarks on a contour
> plot. I want to change my index numbers on the x and y axis to lat and lon
> values. I have been trying to use the example given here:
> http://www.ncl.ucar.edu/Applications/Scripts/tm_2.ncl
>
> Here is my code ( I have only tried altering the second plot out of the 2
> e.g. for plot1(1)..):
>
> ;----------MPIOM vs. ICON comparison plots
>
>
>
> wks = gsn_open_wks("x11","MPIOM_vs_ICON_panelplot_surface")
> gsn_define_colormap(wks,"gui_default")
>
>
> plot1 = new(2,graphic)
>
> res at gsnDraw            = False                    ; don't draw
> res at gsnFrame               = False                              ; don't
> advance frame
> resP                = True
> res at tiYAxisString           = "Latitude"
> res at tiXAxisString           = "Longitude"
> resP at txString               = "Surface T averaged for years 01-99"
> res at lbOrientation         = "vertical"                ; vertical label bar
>
> res at trXMinF                 = 0                      ; set minimum X-axis
> value
> res at trXMaxF                 = 40                    ; set maximum X-axis
> value
> res at trYMinF                = 0                    ; set minimum Y-axis
> value
> res at trYMaxF                 = 120                    ; set maximum Y-axis
> value
> res at tiMainString           = "MPIOM exp 12"
>
>
> plot1(0)             = gsn_csm_contour(wks,Tavg(1,:,:),res)
>
>
> res at trXMinF                 = 0                    ; set minimum X-axis
> value
> res at trXMaxF                = 30                    ; set maximum X-axis
> value
> res at trYMinF                 = 0                    ; set minimum Y-axis
> value
> res at trYMaxF                 = 80                    ; set maximum Y-axis
> value
> res at tiMainString            = "ICON NOSH.UPW"
>
> res at tmXBMode        = "Explicit"
> res at tmXBValues      = (/-44.5,-27.5,-5.5,14.5,34.5/)
> res at tmXBLabels      = "" + res at tmXBValues
> res at tmXBMinorValues = ispan(0,30,1)
>
>
>
>
> plot1(1)             = gsn_csm_contour(wks,potTavg(1,:,:),res)
>
>
> gsn_panel(wks,plot1,(/1,2/),resP)
>
>
> I want longitude from -44.5 E to 34.5 W, once I know how to do it for
> longitude, I can then apply the code to the lat.
>
> thanks in advance!
>
> Michael
>
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