hopkins {spdep} | R Documentation

## Hopkins burnt savanna herb remains

### Description

A 20m square is divided into 40 by 40 0.5m quadrats. Observations are in tens of grams of herb remains, 0 being from 0g to less than 10g, and so on. Analysis was mostly conducted using the interior 32 by 32 grid.

### Usage

    data(hopkins)

### Format

The format is: num [1:40, 1:40] 0 0 0 0 0 0 0 0 0 1 ...

### Source

Upton, G., Fingleton, B. 1985 Spatial data analysis by example: point pattern and quatitative data, Wiley, pp. 38–39.

### References

Hopkins, B., 1965 Observations on savanna burning in the Olokemeji Forest Reserve, Nigeria. Journal of Applied Ecology, 2, 367–381.

### Examples

    data(hopkins)
    image(1:32, 1:32, hopkins[5:36,36:5], breaks=c(-0.5, 3.5, 20),
     col=c("white", "black"))
    box()

[Package spdep version 0.3-25 Index]