filterSpeed: Calculates the ground speed for each location in a track and...

In allisonglider/seabiRds: Prepares biologging data for analysis and upload to the lab database

Calculates the ground speed for each location in a track and removes locations requiring movements above a speed threshold.

Description

Calculates the ground speed for each location in a track and removes locations requiring movements above a speed threshold.

Usage

filterSpeed(data, lon = "lon", lat = "lat", time = "time", threshold)

Arguments

data	Data frame with tracking data for 1 individual, must contain fields with longitude, latitude, and time.
lon	Character string giving the name of longitude variable.
lat	Character string giving the name of latitude variable.
time	Character string giving the name of the time variable, time must be in POSIXct format.
threshold	Maximum ground speed for species in km/hr.

Value

Data frame with speed, distance between points, time between points added. Locations with unrealistic speeds are removed. The alogrithm is iterative, so consecutive unrealistic locations will be removed.

Warning

This function assumes that time values are in chronological order and all values are from a single individual. Make sure that your data are ordered, and use a for loop or some other method to apply this to multiple tracks

allisonglider/seabiRds documentation built on Feb. 14, 2025, 7:37 a.m.