This data set gives locations and top soil heavy metal concentrations (ppm), along with a number of soil and landscape variables, collected in a flood plain of the river Meuse, near the village Stein. Heavy metal concentrations are bulk sampled from an area of approximately 15 m x 15 m.
This data frame contains the following columns:
a numeric vector; x-coordinate (m) in RDM (Dutch topographical map coordinates)
a numeric vector; y-coordinate (m) in RDM (Dutch topographical map coordinates)
topsoil cadmium concentration, ppm.; note that zero cadmium values in the original data set have been shifted to 0.2 (half the lowest non-zero value)
topsoil copper concentration, ppm.
topsoil lead concentration, ppm.
topsoil zinc concentration, ppm.
organic matter, as percentage
flooding frequency class
distance to river Meuse (metres), as obtained during the field survey
logical; indicates whether this is a sample taken in a pit
logical; indicates whether the sample is part of
meuse (i.e., filtered) data set; in addition to the samples
in a pit, an sample (139) with outlying zinc content was removed
logical; indicates whether the sample is used as part of the subset of 98 points in the various interpolation examples of Burrough \& McDonnell
sample refers to original sample number. Eight samples
were left out because they were not indicative for the metal content of
the soil. They were taken in an old pit. One sample contains an outlying
zinc value, which was also discarded for the meuse (155) data set.
The actual field data were collected by Ruud van Rijn and Mathieu Rikken; data compiled for R by Edzer Pebesma
P.A. Burrough, R.A. McDonnell, 1998. Principles of Geographical Information Systems. Oxford University Press.