plot satellite data on map

Hi everybody,

Just start with R.
I want to plot a set of satellites measurements on a world map frame
with a colour scale indicating the strength of measurement.
See I have three arrays as longitude, latitude and the measurements on
those locations.
For example:
lon <-c(0,4,10,17,40,30)
lat <-c(-45,67,0,8,20,-16)
data <-c(-0.5987,0,0.3481,1.6652,-0.5756,4.5612)

-0.5987 is the measurement at (0,-45), if I use

plot(lon,lat)

I can only plot the measure spot but do not know how to specify the
points' colour according to the measurement. And since "lon" and "lat"
is not increasing variable, I could not use "contour" or "image" to
plot.

Does anybody konw how to do this?

Many thanks

Jie

.

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