getisord {spdep} | R Documentation

## Getis-Ord remote sensing example data

### Description

The `xyz` data frame has 256 rows and 3 columns. Vectors `x` and `y` are of length 16 and give the centres of the grid rows and columns, 30m apart. The data start from the bootom left, Getis and Ord start from the top left - so their 136th grid cell is our 120th.

### Usage

    data(getisord)

### Format

This data frame contains the following columns:

x
  grid eastings
y
  grid northings
val
  remote sensing values

### Source

Getis, A. and Ord, J. K. 1996 Local spatial statistics: an overview. In P. Longley and M. Batty (eds) Spatial analysis: modelling in a GIS environment (Cambridge: Geoinformation International), 266.

### Examples

    data(getisord)
    image(x, y, t(matrix(xyz$val, nrow=16, ncol=16, byrow=TRUE)), asp=1)
    text(xyz$x, xyz$y, xyz$val, cex=0.7)
    polygon(c(195,225,225,195), c(195,195,225,225), lwd=2)
    title(main="Getis-Ord 1996 remote sensing data")

[Package spdep version 0.3-25 Index]