gridIndex2nb | R Documentation |

create neighbourhood (nb) object from grid geometry

` gridIndex2nb(obj, maxdist = sqrt(2), fullMat = TRUE, ...) `

`obj` |
object of class SpatialGrid or SpatialPixels |

`maxdist` |
maximum distance to be considered (inclusive), expressed in number of grid cell (sqrt(2) results in queen neighbours) |

`fullMat` |
use dist to compute distances from grid (row/col) indices; FALSE avoids forming the full distance matrix, at a large performance cost |

`...` |
arguments passed on to dist |

Object of class nb, which is a list.

The nb object follows the convention of nb objects in package spdep; it is a list with each list element corresponding to a grid cell or pixel; the list element contains the indices of neighbours defined as cells less than maxdist away, measured in cell unit (N/S/E/W neighbour has distance 1).

Unequal grid cell size is ignored; grid cell row/col indices are taken to be the coordinates from which distances are computed.

Edzer Pebesma, edzer.pebesma@uni-muenster.de

plot.nb in package spdep

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