[GRASSLIST:6780] kriging elevation contours

[wouter buytaert]

hello,

I'd like to generate a DEM from an elevation contour map using kriging
(with the GRASS R interface and the R gdal module). However, kriging
uses point data as input. How do I convert a vector contour map to point
data to use for kriging? Second, and more important (but not really
GRASS related): which is the the optimal point density (when converting
the vector lines to points) for obtaining good results?

Thanks,

Wouter