SDALGCPSSIPoint: SDALGCPSSIPoint function

In SDALGCP: Spatially Discrete Approximation to Log-Gaussian Cox Processes for Aggregated Disease Count Data

Description

This function generate a random point pattern using Simple Sequential Inhibition (SSI) process. An internal function for SDALGCP package.

Usage

SDALGCPSSIPoint(
  poly,
  delta,
  weighted = FALSE,
  pop_shp = NULL,
  lambdamax = NULL,
  pop = NULL,
  n = NULL,
  rho = NULL,
  giveup = NULL
)

Arguments

poly	polygon in which to generate the points.
delta	distance between points.
weighted	To specify if you want to use the population density, default to FALSE, i.e population density is not used.
pop_shp	Optional, The raster of population density map for population weighted approach.
lambdamax	the maximum value of the population density in the polygon.
pop	the population density.
n	optional; the number of points to create in the polygon, if not supplied, it is computed as n = rho*|A|*4/(π*delta^2)
rho	Optional, The packing density, default set to 0.55.
giveup	Number of rejected proposals after which the algorithm should terminate.

Details

This algorithm generates points inside the polygon using Simple Sequential Inhibition (SSI) process.

Value

It returns a list of the coordinates of the points created in each polygon.

Author(s)

Olatunji O. Johnson [e-mail]

Emanuele Giorgi [e-mail]

Peter J. Diggle [e-mail]

Examples

data(PBCshp)
points <- SDALGCPSSIPoint(poly=PBCshp@polygons[[1]]@Polygons[[1]]@coords, delta=100)

SDALGCP documentation built on March 17, 2021, 1:07 a.m.