Re: How to contour on contour on a polar projection map

I think the best way to go about this is to use the overlay procedure to
overlay your 2 maps, and keep your 2D lat/lon coordinates:

res_cn = True
.....
res_cn@gsnPolar = "NH" ; northern hemisphere
res_cn@mpMinLatF = 30. ; only show 30:90N
res_cn@gsnDraw = False ; don't draw the plot
res_cm@gsnFrame = False ; don't advance the frame (/flip the page)
plot = gsn_csm_contour_map_polar(...)
plot2 = gsn_csm_contour(...)
overlay(plot,plot2)
draw(plot)
frame(wks)

http://www.ncl.ucar.edu/Document/Functions/Built-in/overlay.shtml
Hope that helps..
Adam

On 11/29/2010 11:10 AM, Wei Liu wrote:
> Hi, there
>
> Is there some way to overlay contour on contour in the map of polar
> projection.
> I am using ccsm3 ocean/ice data in the pop grid.
>
> Two ways I have tried:
>
> 1) I use pop data that has 2D lat/lon coordinates can be plotted
> directly in physical space.
> t@lon2d = f->TLONG
>
> t@lat2d = f->TLAT
>
> Then I choose
>
> res_cn@mpProjection ="Orthographic"
>
> and then use*gsn_csm_contour_map_overlay <http://www.ncl.ucar.edu/Document/Graphics/Interfaces/gsn_csm_contour_map_overlay.shtml>*
>
> I can do this. But the figure has no tick for the lon/lat, grid ...
>
> 2) I use *PopLatLon* <http://www.ncl.ucar.edu/Document/Functions/Pop_remap/PopLatLon.shtml> to convert the pop grid to a lat/lon grid.
>
> Then usegsn_csm_contour_map_polar
>
> But I can do only one vaiable.
>
> I cannot use overlay the get the contour on contour overlay figure.
>
>
> Thanks for your help~
>
>
>
> W
>
>
>
>
>
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-- 
__________________________________________________
Adam Phillips 
asphilli@ucar.edu
National Center for Atmospheric Research   tel: (303) 497-1726
Climate and Global Dynamics Division         fax: (303) 497-1333
P.O. Box 3000				
Boulder, CO 80307-3000    http://www.cgd.ucar.edu/cas/asphilli
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