Re: (no subject)

Hi Mads,
Not that simple a problem.
2 possibilities:
1) Assuming you just want to see the differences, and if your two
landmask datasets are on the same grid, I'd subtract one from the other
(dataset A - dataset B). That would create an array that spans from -1
to 1, with -1 signifying that B has a 1 and A = 0, 0 = they match, and 1
signifying B has a 0 and A - 1 for that gridpoint. Then plot..

2) If they are not on the same grid, and you don't want to contour one
of them (I don't blame you), then the only other thing I can suggest is
to do a panel plot that shows both maps. I'm not sure what overlaying
both fields on one plot will get you, even if you try to make use of
transparency for land or ocean on the underlying plot.

For both options you're going to want to set cnFillMode = "RasterFill"
so you can see the individual grid cells values.

Hope that helps..
Adam

On 12/01/2010 11:33 AM, Madeleine Patterson wrote:
> Hello,
>
> I have a very simple mapping problem - I have 2 sets of global landmask
> data (i.e. 1's and 0's) that I want to visualize, and overlay, but am
> not sure what sort of plot type I'd use; I don't want to draw contours,
> I just want to plot a variable on a 2-d global grid - whats the best
> plot type to look at this data with?
>
> Thanks
>
> Mads
>
>
>
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Adam Phillips 
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National Center for Atmospheric Research   tel: (303) 497-1726
Climate and Global Dynamics Division         fax: (303) 497-1333
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