A First guess would be to have a look at ?map and change the 'add'
argument to TRUE. This would overlay the map to the image plot that you
produced before. It may be that you need to mess around with different
projections etc. but I can not give you any advice on that without
digging deep into the documentation....
HTH
Jannis
On 02/14/2011 03:14 AM, cassie jones wrote:
Dear all,
I have a data set which has latitude, longitude (not in increasing order)
and observed precipitation corresponding to those locations. I am using
image.plot command for that. But I want to overlay a map of US on that plot.
I know we can use map('usa') to draw it, but I dont know how can I overlay
it on the plot of the precipitation data. Can anyone please help me with it?
Thanks in advance.
Cassie.
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