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.
sample x y cadmium Min. : 1.00 Min. :178605 Min. :329714 Min. : 0.000 1st Qu.: 41.75 1st Qu.:179358 1st Qu.:330771 1st Qu.: 0.800 Median : 82.50 Median :179945 Median :331558 Median : 1.900 Mean : 82.50 Mean :179989 Mean :331614 Mean : 3.109 3rd Qu.:123.25 3rd Qu.:180626 3rd Qu.:332410 3rd Qu.: 3.725 Max. :164.00 Max. :181390 Max. :333611 Max. :18.100 copper lead zinc elev Min. : 14.00 Min. : 27.00 Min. : 107.0 Min. : 0.000 1st Qu.: 23.00 1st Qu.: 68.75 1st Qu.: 191.8 1st Qu.: 7.390 Median : 29.50 Median :116.00 Median : 307.5 Median : 8.124 Mean : 39.42 Mean :148.55 Mean : 464.6 Mean : 7.775 3rd Qu.: 48.00 3rd Qu.:201.75 3rd Qu.: 662.5 3rd Qu.: 8.915 Max. :128.00 Max. :654.00 Max. :1839.0 Max. :10.520 dist.m om ffreq soil Min. : 10.0 Min. : 1.000 Min. :1.000 Min. :1.000 1st Qu.: 80.0 1st Qu.: 5.000 1st Qu.:1.000 1st Qu.:1.000 Median : 270.0 Median : 6.550 Median :1.000 Median :1.000 Mean : 294.2 Mean : 7.291 Mean :1.604 Mean :1.463 3rd Qu.: 450.0 3rd Qu.: 8.950 3rd Qu.:2.000 3rd Qu.:2.000 Max. :1000.0 Max. :17.000 Max. :3.000 Max. :3.000 NA's :2 lime landuse in.pit in.meuse155 in.BMcD Min. :0.0000 W :54 Mode :logical Mode :logical Mode :logical 1st Qu.:0.0000 Ah :42 FALSE:156 FALSE:9 FALSE:66 Median :0.0000 Am :22 TRUE :8 TRUE :155 TRUE :98 Mean :0.2988 Fw :10 3rd Qu.:1.0000 Ab : 8 Max. :1.0000 (Other):27 NA's : 1
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