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Add Velocity Timeseries

Source: R/velocities.R
add_set_vels.Rd

This function calculates the headings and speeds of individuals based on two location points and the time taken to travel between those points.

Usage

add_set_vels(
  data,
  geo = FALSE,
  verbose = FALSE,
  parallelize = FALSE,
  independent_call = TRUE
)

Arguments

data

A dataframe with the time series of individuals' positions. Columns must include: t, id, x, y.

geo

Logical, whether positions are geographic coordinates, default = TRUE.

verbose

Logical, whether to post updates on progress, default = FALSE.

parallelize

Logical, whether to run the function in parallel, default = FALSE.

independent_call

Logical, whether the function is called by itself or as part of the package pipeline (through add_velocities). The default is set to TRUE, reflecting the direct call of the function by the user.

Value

The input dataframe with a new speed and heading (rotational, in rads) columns.

See also

add_velocities

Author

Marina Papadopoulou m.papadopoulou.rug@gmail.com

Examples


data <- data.frame(
x = rnorm(25, sd = 3),
y = rnorm(25, sd = 3),
t = as.POSIXct(1:25, origin = Sys.time()),
id = rep(1, 25)
)

data <- add_set_vels(data, geo = FALSE)