amt: random_points – R documentation

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random_points

Generate random points

Description

Functions to generate random points within an animals home range. This is usually the first step for investigating habitat selection via Resource Selection Functions (RSF).

Usage

random_points(x, ...)

## S3 method for class 'hr'
random_points(x, n = 100, type = "random", presence = NULL, ...)

## S3 method for class 'sf'
random_points(x, n = 100, type = "random", presence = NULL, ...)

## S3 method for class 'SpatialPolygons'
random_points(x, n = 100, type = "random", presence = NULL, ...)

## S3 method for class 'track_xy'
random_points(x, level = 1, hr = "mcp", n = nrow(x) * 10, type = "random", ...)

Arguments

`x`	`[track_xy, track_xyt]` A track created with `make_track`.
`...`	`[any]` None implemented.
`n`	`[integer(1)]` The number of random points.
`type`	`[character(1)]` Argument passed to `sp::spsample type`. The default is `random`.
`presence`	`[track]` The presence points, that will be added to the result.
`level`	`[numeric(1)]` Home-range level of the minimum convex polygon, used for generating the background samples.
`hr`	`[character(1)]` The home range estimator to be used. Currently only MCP is implemented.

Note

For objects of class track_xyt the timestamp (t_) is lost.

Examples

data(deer)

# track_xyt ---------------------------------------------------------------
# Default settings
rp1 <- random_points(deer)

## Not run: 
plot(rp1)

## End(Not run)

 ## Not run: 
trast <- raster(bbox(deer, buffer = 5000), res = 30)
rp3 <- random_points(deer, hr = "kde", trast = trast) # we need a larger template raster

plot(rp3)

## End(Not run)


# Only one random point for each observed point
rp <- random_points(deer, factor = 1)
## Not run: 
plot(rp)

## End(Not run)

# Within a home range -----------------------------------------------------
hr <- hr_mcp(deer, level = 1)

# 100 random point within the home range
rp <- random_points(hr, n = 100)
## Not run: 
plot(rp)

## End(Not run)

# 100 regular point within the home range
rp <- random_points(hr, n = 100, type = "regular")
## Not run: 
plot(rp)

## End(Not run)
# 100 hexagonal point within the home range
rp <- random_points(hr, n = 100, type = "hexagonal")
## Not run: 
plot(rp)

## End(Not run)

amt

Animal Movement Tools

v0.1.4

GPL-3

Authors

Johannes Signer [aut, cre], Brian Smith [ctb], Bjoern Reineking [ctb], Ulrike Schlaegel [ctb], John Fieberg [ctb], Scott LaPoint [dtc]

Initial release