speed2prob: Compute probability of a bird speed

In Rafnuss/GeoPressureR: Global Positioning by Atmospheric Pressure

Compute probability of a bird speed

Description

Converts a speed (airspeed or ground speed) to a probability based on the movement model.

Usage

speed2prob(speed, movement)

Arguments

speed	airspeed or ground speed in km/h
movement	a list of the movement model parameter defined with graph_set_movement

Value

Probability values corresponding to the speed provided.

See Also

Other movement: bird_create(), graph_set_movement(), graph_transition(), plot_graph_movement(), tag_download_wind()

Examples

speed <- seq(1, 120)
low_speed_fix <- 20 # minimum speed allowed
prob <- speed2prob(
  speed,
  list(
    method = "gamma",
    shape = 7,
    scale = 7,
    low_speed_fix = low_speed_fix
  )
)
plot(speed, prob,
  type = "l",
  xlab = "Groundspeed [km/h]",
  ylab = "Probability"
)
abline(v = low_speed_fix)

# Using airspeed
bird <- bird_create("Acrocephalus arundinaceus")
prob <- speed2prob(
  speed,
  list(
    method = "power",
    bird = bird,
    power2prob = \(power) (1 / power)^3,
    low_speed_fix = low_speed_fix
  )
)
plot(speed, prob, type = "l", xlab = "Airspeed [km/h]", ylab = "Probability")
abline(v = low_speed_fix)

Rafnuss/GeoPressureR documentation built on April 17, 2025, 12:58 p.m.