This data set contains the calcium content measured in soil samples taken from the 0-20cm layer at 178 locations within a certain study area divided in three sub-areas. The elevation at each location was also recorded.
The first region is tipically flooded during the rain season and not used as an experimental area. The calcium levels would represent the natural content in the region. The second region has received fertilizers a while ago and is tipically occupied by rice fields. The third region has recieved fertilizers recently and is frequently used as an experimental area.
data(camg)A data frame with 178 observations on the following 10 variables.
east-west coordinates, in meters.
north-south coordinates, in meters.
elevation, in meters
a factor where numbers indicate different sub-regions within the area
calcium content in the 0-20cm soil layer, measured in \(mmol_c/dm^3\).
calcium content in the 0-20cm soil layer, measured in \(mmol_c/dm^3\).
calcium content in the 0-20cm soil layer.
calcium content in the 20-40cm soil layer, measured in \(mmol_c/dm^3\).
calcium content in the 20-40cm soil layer, measured in \(mmol_c/dm^3\).
calcium content in the 20-40cm soil layer.
More details about this data-set, including coordinates of the region
and sub-region borders
can be found in the data object ca20.
# NOT RUN {
plot(camg[-(1:2),])
mg20 <- as.geodata(camg, data.col=6)
plot(mg20)
points(mg20)
# }
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