A function to compute the contiguity matrix

Description

The function is based on rgdal and spdep packages and can be used with a shape file or an R spatial object (SpatialPolygonsDataFrame).

Usage

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contig(spatobj = NULL, folder = NULL, shape = NULL, queen = TRUE)

Arguments

spatobj

- a spatial object (SpatialPolygonsDataFrame) containing geographic information

folder

- a character vector with the folder (directory) name indicating where the shapefile with the geographic information is located.

shape

- a character vector with the name of the shapefile (without the .shp extension) which contains the geographic information

queen

= TRUE (by default) for queen criteria, FALSE for rook criteria

Value

A first order contiguity (adjacency) matrix, where each element [i,j] equals 1 if i-th and j-th spatial units are adjacent, 0 otherwise (queen or rook criteria)

See Also

Other spatial functions used for segregation indices computation: area, perimeter, distance, distcenter, boundaries

Examples

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 contig(segdata) 
foldername <- system.file('extdata', package = 'OasisR')
shapename <- 'segdata'
contig(folder = foldername, shape = shapename)

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