PCB138 measurements in sediment at the NCP, the Dutch part of the North Sea

Description

This data set gives a point set with altitudes, digitized from the 1:10,000 topographical map of the Netherlands.

Usage

data(pcb)

Format

This data frame contains the following columns:

year

measurement year

x

x-coordinate; UTM31

y

y-coordinate; UTM31

coast

distance to coast, m.

depth

sea water depth, m.

PCB138

PCB-138, measured on the sediment fraction smaller than 63 mu, in mu g/kg dry matter; BUT SEE NOTE BELOW

yf

year; as factor

Note

A note of caution: The PCB-138 data are provided only to be able to re-run the analysis done in Pebesma and Duin (2004; see references below). If you want to use these data for comparison with PCB measurements elsewhere, or if you want to compare them to regulation standards, or want to use these data for any other purpose, you should first contact mailto:basisinfodesk@rikz.rws.minvenw.nl. The reason for this is that several normalisations were carried out that are not reported here, nor in the paper below.

References

http:/www.gstat.org/, http://www.rikz.nl/

Pebesma, E. J., & Duin, R. N. M. (2005). Spatial patterns of temporal change in North Sea sediment quality on different spatial scales. In P. Renard, H. Demougeot-Renard & R. Froidevaux (Eds.), Geostatistics for Environmental Applications: Proceedings of the Fifth European Conference on Geostatistics for Environmental Applications (pp. 367-378): Springer.

See Also

ncp.grid

Examples

data(pcb)
library(lattice)
xyplot(y~x|as.factor(yf), pcb, aspect = "iso")
# demo(pcb)