[R] Making heatmaps

[wns09a]

Basically, I have the location data for about 1,000 pitches.  I can get them
to show up correctly on normal plots, but I am genuinely messed up on
heatmaps.

> location <- read.csv('C:/Users/William/Downloads/09Location.csv')
> location <- as.matrix(location)

Like I said, that can get a plot fine.
Should I use image or heatmap?
For the record, I want something like
this:http://2.bp.blogspot.com/_hZYdwHvvD9U/THo_YaK0dGI/AAAAAAAAAgg/VjzVngS2-BU/s1600/clifflee3.png

I don't need the contour lines, though.
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