inlabru (version 2.1.1)

plotsample: Create a plot sample.

Description

Creates a plot sample on a regular grid with a random start location.

Usage

plotsample(spdf, boundary, x.ppn = 0.25, y.ppn = 0.25, nx = 5, ny = 5)

Arguments

spdf

A SpatialPointsDataFrame defining the points that are to be sampled by the plot sample.

boundary

A SpatialPolygonsDataFrame defining the survey boundary within which the points occur.

x.ppn

The proportion of the x=axis that is to be included in the plots.

y.ppn

The proportion of the y=axis that is to be included in the plots.

nx

The number of plots in the x-dimension.

ny

The number of plots in the y-dimension.

Value

A list with three components:

plots:

A SpatialPolygonsDataFrame object containing the plots that were sampled.

dets:

A SpatialPointsDataFrame object containing the locations of the points within the plots.

counts:

A dataframe containing the following columns

x:

The x-coordinates of the centres of the plots within the boundary.

y:

The y-coordinates of the centres of the plots within the boundary.

n:

The numbers of points in each plot.

area:

The areas of the plots within the boundary

.

Examples

# NOT RUN {
library(inlabru)
library(raster)
data(gorillas)
plotpts = plotsample(gorillas$nests,gorillas$boundary,x.ppn=0.4,y.ppn=0.4,nx=5,ny=5)
ggplot() +gg(plotpts$plots) +gg(plotpts$dets,pch="+",cex=2) +gg(gorillas$boundary)

# }