An internal function that calculates step lengths, turning angles, and time steps for a given animal ID.
A data frame that contains the columns associated with the x and y
coordinates as well as the date-time. For easier interpretation of the
model results, it is recommended that coordinates be stored after UTM
projection (meters) as opposed to unprojected in decimal degrees (map
units). Date-time should be of class
character. A vector of the column names under which the coordinates are stored. The name for the x coordinate should be listed first and the name for the y coordinate second.
A data frame where all original data are returned and new columns are
added for step length (
step), turning angle (
net-squared displacement (
NSD), and time step (
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