Lansing Woods Tree Data

SUMMARY:

The lansing data frame is a marked spatial point process data set of 1217 trees. The location and species type is recorded for each tree.

DATA DESCRIPTION:

This data frame contains the following columns:

ARGUMENTS:

x
relative x coordinate.
y
relative y coordinate.
species
a factor identifying the species, either "hickory" or "maple". The data set from Diggle (1983) also included 346 red oaks, 448 white oaks, 135 black oaks and 105 miscellaneous trees, these trees are not included in this data set.

SOURCE:

The data are from a 19.6 acre square plot in Lansing Woods, Clinton County, Michigan, USA. It was originally described by Gerrard (1969). The values were copied from Diggle (1983).

REFERENCES:

Diggle, Peter. (1983). Statistical Analysis of Spatial Point Patterns. Academic Press, New York.

Gerrard, D. J. (1969). Competition quotient: a new measure of the competition affecting individual forest trees. Research Bulletin No. 20, Agricultural Experiment Station, Michigan State University.