latticeDensity (version 1.2.6)

nodeFilling: Produces a grid of locations inside the region boundary.

Description

nodeFilling produces a grid of locations that are the nodes in the diffusion process.

Usage

nodeFilling(poly, node_spacing, hole_list = NULL)

Arguments

poly

A matrix that contains the vertices of the bounding polygon.

node_spacing

The distance between grid locations.

hole_list

Optional list of holes to be removed from the region

Value

An object of type nodeFillingOutput is produced.

• EW_locs EW coordinates for the contour plot.

• NS_locs NS coordinates for the contour plot.

• nodes Matrix of node locations.

• poly Matrix of vertices of boundary polygon.

• node_spacing Vertical and horizontal node spacing.

• hole_list List of polygons representing holes in region.

Details

nodeFilling superimposes a square grid of points over the region, with spacing given by the parameter node_spacing. The points contained in the region are retained. The output, a nodeFillingOutput object, contains the boundaries of the region (and holes), the set of nodes, and EW and NS coordinates necessary for creating a contour plot.

References

Ronald P. Barry, Julie McIntyre. Estimating animal densities and home range in regions with irregular boundaries and holes: A lattice-based alternative to the kernel density estimator. Ecological Modelling 222 (2011) 1666-1672. <doi:10.1016/j.ecolmodel.2011.02.016>

Examples

# NOT RUN {
plot.new()
data(polygon1)
nodeFillingOutput <- nodeFilling(poly=polygon1,node_spacing=0.02)
plot(nodeFillingOutput)
formLatticeOutput <- formLattice(nodeFillingOutput)
plot(formLatticeOutput)

# }