gstat (version 2.1-2)

jura: Jura data set

Description

The jura data set from Pierre Goovaerts' book (see references below). It contains four data.frames: prediction.dat, validation.dat and transect.dat and juragrid.dat, and three data.frames with consistently coded land use and rock type factors, as well as geographic coordinates. The examples below show how to transform these into spatial (sp) objects in a local coordinate system and in geographic coordinates, and how to transform to metric coordinate reference systems.

Usage

data(jura)

Format

The data.frames prediction.dat and validation.dat contain the following fields:

Xloc

X coordinate, local grid km

Yloc

Y coordinate, local grid km

Landuse

see book and below

Rock

see book and below

Cd

mg cadmium \(\mbox{kg}^{-1}\) topsoil

Co

mg cobalt \(\mbox{kg}^{-1}\) topsoil

Cr

mg chromium \(\mbox{kg}^{-1}\) topsoil

Cu

mg copper \(\mbox{kg}^{-1}\) topsoil

Ni

mg nickel \(\mbox{kg}^{-1}\) topsoil

Pb

mg lead \(\mbox{kg}^{-1}\) topsoil

Zn

mg zinc \(\mbox{kg}^{-1}\) topsoil

The data.frame juragrid.dat only has the first four fields. In addition the data.frames jura.pred, jura.val and jura.grid also have inserted third and fourth fields giving geographic coordinates:

long

Longitude, WGS84 datum

lat

Latitude, WGS84 datum

Author

Data preparation by David Rossiter ([e-mail]) and Edzer Pebesma; georeferencing by David Rossiter

References

Goovaerts, P. 1997. Geostatistics for Natural Resources Evaluation. Oxford Univ. Press, New-York, 483 p. Appendix C describes (and gives) the Jura data set.

Atteia, O., Dubois, J.-P., Webster, R., 1994, Geostatistical analysis of soil contamination in the Swiss Jura: Environmental Pollution 86, 315-327

Webster, R., Atteia, O., Dubois, J.-P., 1994, Coregionalization of trace metals in the soil in the Swiss Jura: European Journal of Soil Science 45, 205-218

Examples

data(jura)
summary(prediction.dat)
summary(validation.dat)
summary(transect.dat)
summary(juragrid.dat)

# the following commands were used to create objects with factors instead
# of the integer codes for Landuse and Rock:
if (FALSE) {
  jura.pred = prediction.dat
  jura.val = validation.dat
  jura.grid = juragrid.dat

  jura.pred$Landuse = factor(prediction.dat$Landuse, 
	labels=levels(juragrid.dat$Landuse))
  jura.pred$Rock = factor(prediction.dat$Rock, 
	labels=levels(juragrid.dat$Rock))
  jura.val$Landuse = factor(validation.dat$Landuse, 
	labels=levels(juragrid.dat$Landuse))
  jura.val$Rock = factor(validation.dat$Rock, 
	labels=levels(juragrid.dat$Rock))
}

# the following commands convert data.frame objects into spatial (sp) objects
#   in the local grid:
require(sp)
coordinates(jura.pred) = ~Xloc+Yloc
coordinates(jura.val) = ~Xloc+Yloc
coordinates(jura.grid) = ~Xloc+Yloc
gridded(jura.grid) = TRUE

# the following commands convert the data.frame objects into spatial (sp) objects
#   in WGS84 geographic coordinates
# example is given only for jura.pred, do the same for jura.val and jura.grid
# EPSG codes can be found by searching make_EPSG()
jura.pred <- as.data.frame(jura.pred)
coordinates(jura.pred) = ~ long + lat
proj4string(jura.pred) = CRS("+init=epsg:4326")