[R] Contour plot with messy field data.

[chuck.01]

Hello, 
I have some data that will be in the form:

structure(list(station = structure(c(20L, 2L, 4L, 19L, 3L, 11L, 
1L, 5L, 10L, 12L, 17L, 18L, 6L, 9L, 13L, 16L, 7L, 8L, 15L, 14L
), .Label = c("1", "10", "11", "12", "13", "14", "15", "16", 
"17", "18", "19", "2", "3", "4", "5", "6", "7", "8", "9", "scope"
), class = "factor"), distance = c(0, 2, 0.8, 3, 1.2, 1.7, 1, 
1.4, 2.8, 2.2, 4.5, 4.2, 2.8, 3.6, 3.4, 4.8, 3.8, 4.2, 4.8, 4.4
), degrees = c(0, 90, 89.9, 82.4, -59, 69.4, 10.8, 45, 69, 26.6, 
63.4, 61.6, 45, 56.3, 28.1, 51.7, 38.7, 45, 38.3, 25.4), z = c(0L, 
0L, -1L, 0L, 0L, -1L, 0L, -1L, -1L, 0L, 0L, 0L, -1L, -1L, 0L, 
0L, -1L, -1L, 0L, 0L), x = c(0, 0, 0, 0.4, 0.6, 0.6, 1, 1, 1, 
2, 2, 2, 2, 2, 3, 3, 3, 3, 3.8, 4), y = c(0, 2, 0.8, 3, -1, 1.6, 
0.19, 1, 2.6, 1, 4, 3.7, 2, 3, 1.6, 3.8, 2.4, 3, 3, 1.9)), .Names =
c("station", 
"distance", "degrees", "z", "x", "y"), row.names = c(1L, 11L, 
13L, 10L, 12L, 20L, 2L, 14L, 19L, 3L, 8L, 9L, 15L, 18L, 4L, 7L, 
16L, 17L, 6L, 5L), class = "data.frame")

Basically, I would like to create a contour plot and eventually be able to
calculate the % area within each contour.  This only has 2 contour lines of
height z=0, and z=-1.  I would like to have as many and these z values
likely won't fall nicely into a contour with others.  

This may give you an idea of the spatial arrangement of observations. 
http://r.789695.n4.nabble.com/file/n4353603/Slide1.png 

Does anyone have any suggestions on how to begin doing this?



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