make.line: Linear Detector Array

In secrlinear: Spatially Explicit Capture-Recapture for Linear Habitats

Linear Detector Array

Description

Build secr ‘traps’ object, positioning detectors along a predefined set of lines. make.line is in the same family as secr functions make.grid etc.

Usage

make.line(SLDF, n = 10, startbuffer = 0, by = 20, endbuffer = 0, cluster
= NULL,
type = c("fixedstart", "randomstart", "centred"), detector = "multi")

Arguments

SLDF	linearmask object or SpatialLinesDataFrame from sp
n	maximum number of detectors (or clusters of detectors) per line
startbuffer	distance of first detector from start of line(s)
endbuffer	minimum distance of last detector from end of line(s)
by	spacing between detectors (or clusters of detectors) (m)
cluster	numeric vector of within-cluster positions (m from start)
type	character
detector	character value for detector type - "single", "multi" etc.

Details

Detectors are placed independently on each line.

Value

An object of class traps comprising a data frame of x- and y-coordinates, the detector type ("single", "multi", or "proximity" etc.), and possibly other attributes. The SpatialLinesDataFrame is retained as attribute ‘SLDF’.

See Also

make.traps

Examples

x <- seq(0, 4*pi, length = 200)
xy <- data.frame(x = x*100, y = sin(x)*300)
mask <- read.linearmask(data = xy, spacing = 20)

trps <- make.line(mask, n = 15, startbuffer = 1000, by = 50)
plot(mask)
plot(trps, add = TRUE)

secrlinear documentation built on Oct. 17, 2023, 9:07 a.m.