Re: (no subject)

You can draw maps that combine color-filled topography with color filled
geopotential heights, but where the two color fills overlap only one
will be visible.

Geopotential heights is typically a smooth enough field that you can
draw them using contours only, and these can be easily overlaid on a
color-filled topography field.
See the overlay applications page here for examples on how to overlay a
contour field on a color-filled field:
http://www.ncl.ucar.edu/Applications/overlay.shtml

There are numerous other examples on the NCL applications page that deal
with color-filling and the like: http://www.ncl.ucar.edu/Applications/

Within the next 6 months (or so) NCL will likely be able to draw
transparent colors, which would allow for two color-filled contour
fields occupying the same space to be visible. This of course doesn't
help you right now though...
Good luck,
Adam

On 07/27/2010 01:27 AM, lumos.leee wrote:
> Hello, I’m a student of Peking University and I’m about to use ncl to
> draw some contour maps in atmospheric research.
>
> I was just wondering if ncl can draw maps combined with topography and
> geopotential height.
>
> For example, I’d like to draw the topography of north America which
> includes the high elevation of Rocky mountains and flat plain and the
> Five Lakes in different colors. And I also like to draw the geopotential
> height filled with color on the topography. Since one figure in matlab
> can only use one colormap, I have no idea to use what command to draw
> such kind of maps. Can you tell me some way to go through it?
>
> Thank you.
>
> NCL version 5.2.1
>
> --
> Cheng Li
> Dept. Atmospheric Sciences
> Peking Univ.
> Beijing 100871
> P. R. China
>
>
>
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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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