[R] Idetntifying nearest topographic contours to data points

[sam.e]

Hi there, 
I have two data sets, one of locations at different elevations (x,y,z) and
the other of points that make up topographic contours (also x,y,z). I have
used:

result<-apply(distppll(data2,cbind(topocon[-nrow(topocon),],topocon[-1,])),1,min)

where 'data2' are my measurement coordinates (x, y) and 'topocon' are my
topographic contours (x,y). While this gives me an output of the distance
from each data point to the nearest topographic contour point, I would also
like to output the 'z' value of the nearest topographic point to each data
point. Does anyone know how I could go about this?

Ideally what I would like to output is a matrix which has:
data elevation (data2$z)     distance to nearest contour    elevation of
nearest contour (topocon$z)

Any help would be much appreciated,
Sam

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