simPts: Simulates point process on a rectangular grid

Description Usage Arguments Value Author(s) See Also Examples

View source: R/simPts.r

Description

Generates a set of points from either a homogeneous or inhomogeneous Poisson process with optional clustering. This is a wrapper function for rpoispp from the spatstat package. The intensity is defined by covariates on a grid, an intensity formula and parameters. The correlation structure is defined by the model and the correlation parameters.

Usage

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simPts(covariates,int.formula=~1, int.par=c(1), EN=100,
                    model, showplot=FALSE, showpts=FALSE, ...)

Arguments

covariates

a matrix with columns x,y and any number of covariates x and y are the mid points of the grid cells; the order of the rows must match the formulation for function im

int.formula

formula for deriving expected intensity from covariates

int.par

parameters for intensity formula

EN

expected number of points

model

a spatial model for suimulation. See RFsimulate for further specification.

showplot

if TRUE, plot intensity and point process

showpts

if TRUE show points on the plot

...

parameters, if any, passed to plot

Value

ppp object of point locations

Author(s)

Devin Johnson; Jeff Laake

See Also

simCovariates

Examples

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hab.range=30
probs=c(1/3,2/3)
covariates = simCovariates(hab.range, probs)
xpp=simPts(covariates=covariates,int.formula=~factor(habitat),int.par=c(0,1,2))
plot(xpp)

DSpat documentation built on May 30, 2017, 2:35 a.m.