getisord: Getis-Ord remote sensing example data

In spdep: Spatial Dependence: Weighting Schemes, Statistics and Models

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 bottom 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")

Example output

Loading required package: sp
Loading required package: Matrix

spdep documentation built on Aug. 19, 2017, 3:01 a.m.