Compute a geographic distance matrix

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Description

Calculates a geographic distance matrix based on a PresenceAbsence or a two column matrix of x(longitude) and y(latitude).

Usage

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lets.distmat(xy, asdist = TRUE, ...)

Arguments

xy

A PresenceAbsence object or a matrix with two columns (longitude, latitude).

asdist

Logical, if TRUE the result will be an object of class dist, if FALSE the result will be an object of class matrix.

...

Arguments to be passed to the function rdist.earth of package fields.

Details

This function basically facilitates the use of rdist.earth on a PresenceAbsence object, allowing also the user to have directly a dist object.

Value

The user can choose between dist and matrix class object to be returned. The resulting values are in kilometers (but see the argument 'miles' in rdist.earth).

Author(s)

Bruno Vilela & Fabricio Villalobos

Examples

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## Not run: 
data(PAM)
distPAM <- lets.distmat(PAM)   

## End(Not run)

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