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Clean data based on speed

Source: R/event_flag_mcconnell.R
event_flag_mcconnell.Rd

This function uses the algorithm by McConnell et al. (2012) to clean data based on speed. This is a port of the speedfilter function from the trip package, with an optional endpoint check.

Usage

event_flag_mcconnell(x, max_speed = NULL, check_first_last = FALSE)

Arguments

x

A move2 object.

max_speed

Speed, provided as a units object, e.g. as_units(50, "m/s").

check_first_last

Logical. If TRUE, also evaluate the first and last currently valid point of each track using the endpoint RMS described above. If either endpoint is removed, the McConnell filter is rerun on the reduced track until the result is stable. It defaults to FALSE to maintain the original behaviour of the McConnell algorithm.

Value

A logical vector of the same length as the number of events in x, indicating which points are valid.

Details

When check_first_last = TRUE, the function also evaluates the first and last currently valid point of each track using an endpoint Root Mean Square (RMS):

  • first point: RMS of speed(1,2) and speed(1,3)

  • last point: RMS of speed(n-1,n) and speed(n-2,n)

If an endpoint is removed, the McConnell filter is rerun on the reduced track, and the endpoint check is repeated until the result is stable.

Examples

event_flag_mcconnell(example_tt, max_speed = as_units(50, "m/s"))
#>  [1]  TRUE  TRUE FALSE  TRUE  TRUE  TRUE  TRUE FALSE  TRUE  TRUE  TRUE  TRUE
#> [13] FALSE  TRUE  TRUE