[ncl-talk] orthographic projection

[David Brown]

Hi Matt,

The standard tickmarks displayed when pmTickMarkDisplayMode is set to
"always" only appear where the map touches the border along a line.
This orthographic projection only touches the rectangular border at 4
points (not lines). There are specialized tick mark labels for polar
stereographic plots that follow the circular boundary of the plot, but
these are not available for orthographic projections as of now.
However, even when no ticks or labels are produced the TickMark object
does draw the rectangular boundary lines. That is the box around the
globe as you have drawn it. Here are some example plots to illustrate.
The first plot, labelled "Frame 3" has the limits set to less than the
maximal area. You can see that there are ticks and maybe labels only
along the border where the map is clipped by the boundaries. Frame 3a,
with the map limits set to "MaximalArea" is equivalent to your plot.
Both Frame 3 and Frame 3a have pmTickMarkDisplayMode set to "always";
mpPerimOn is False in all cases.  Frame 3b gets rid of the border by
setting pmTickMarkDisplayMode to "never".
Hope this helps.
 -dave





On Thu, Aug 6, 2015 at 1:04 PM, Matthew Fearon <Matthew.Fearon at dri.edu> wrote:
> Dear NCL users,
>
> I've created the attached orographic map using a slightly modified version
> of the topo_9.ncl example found here
>
> https://www.ncl.ucar.edu/Applications/Scripts/topo_9.ncl
>
> I was curious how/if I could apply the following adjustments:
>
> 1. Turn off the map perimeter box; mpPerimOn=False seems to be ignored
>
> 2. Add a few lat/long labels; pmTickMarkDisplayMode="Always" also seems
> ignored.
>
> Below is a snippet of my resources used.
> thanks,
> Matt
>
>
>
>
>   res at cnFillColors             = reds
>
>   res at gsnAddCyclic             = False
>
>
>   res at mpFillOn                    = False
>
>   res at mpOutlineOn                 = True
>
>   res at mpGridAndLimbOn             = True
>
>   res at mpGridLineDashPattern       = 2
>
>   res at mpGridLineThicknessF        = 1.5
>
>   res at mpOutlineBoundarySets       = "National"
>
>   res at mpDataBaseVersion           = "Ncarg4_1"
>
>   res at mpDataSetName               = "Earth..4"
>
>   res at mpNationalLineThicknessF    = 4
>
>   res at mpGeophysicalLineThicknessF = 4
>
>
>
> ;---Zoom in on area of interest
>
> ;  res at mpMinLatF                = minlat
>
> ;  res at mpMaxLatF                = maxlat
>
> ;  res at mpMinLonF                = minlon
>
> ;  res at mpMaxLonF                = maxlon
>
>  res at mpCenterLonF               = -25.
>
>  res at mpCenterLatF               = 40.
>
>  res at mpProjection               = "Orthographic"
>
>  res at mpPerimOn                  = False
>
>  res at pmTickMarkDisplayMode      = "Always"
>
>
> ;res at gsnPolar                   = "NH"
>
> ;redMap = gsn_csm_contour_map_polar(wks, Band1, res)
>
>  redMap = gsn_csm_contour_map(wks, Band1, res)
>
>
>
> ;---Overlay everything to create the topo map
>
>   overlay(redMap, greenMap)
>
>   overlay(redMap, blueMap)
>
>
>   return(redMap)
>
>
>
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