Function reference • sftrack

Creation/conversion
`as_sftrack()`	Convert objects into sftrack objects.
`as_sftraj()`	Convert objects into sftrack objects.
`new_sftrack()`	Define an sftrack
`new_sftraj()`	Define an sftraj
`print(<sftrack>)`	Print methods for sftrack
`print(<sftraj>)`	Print methods for sftraj
`as_sftrack(<track_xy>)` `as_sftraj(<track_xy>)` `sftrack_to_track_xy()`	convert to and from amt class 'track_xy'
`as_sftrack(<ltraj>)` `as_sftraj(<ltraj>)` `sftrack_to_ltraj()` `sftraj_to_ltraj()`	convert to and from ltraj
`as_sftrack(<trackeRdata>)` `as_sftraj(<trackeRdata>)` `sftrack_to_trackeR()` `sftraj_to_trackeR()`	convert to and from trackeR
Data checks and fixes
`calc_sort_index()`	Calculate a new sort index for groups
`calc_dx()` `calc_dy()` `calc_difftime()` `calc_steplen()` `calc_absangle()` `calc_speed()` `calc_relangle()`	step calculation functions
`check_NA_coords()`	Check if coordinates contain NAs in some columns but not others
`check_NA_group()`	Check there are no NAs in burst
`check_group_id()`	Check there is a grouping id present
`check_group_names()`	Are group names equivalent for each s_group?
`check_names_exist()`	Check if a set of column names are found in a data frame and return an error if not
`check_ordered()`	Checks if grouping is ordered by time and then outputs the correct order
`check_t_regular()`	Check if time is regular for each burst and returns logical for each burst
`check_time()`	Check if time is integer or posix
`dup_timestamp()`	check that time is unique
`fix_zero()`	fix 0's to NAs in latitude and longitude
`is_linestring()`	Is a trajectory geometry a linestring or a point
`which_duplicated()`	Which grouping/time stamp combos are duplicated.
Plotting
`geom_sftrack()`	Function to plot sftrack objects in ggplot
`plot(<sftrack>)` `plot(<sftraj>)`	Methods for plotting sftrack/sftraj
Group management
`active_group()`	Access the active_group value
`active_group<-`()	Set new active group
`group_labels()`	Shows grouping labels created from the s_group and the c_grouping
`group_names()`	Display the levels of the sort index
`group_summary()`	Summarize sftrack objects
`make_s_group()` `make_c_grouping()` `c(<s_group>)` `c(<c_grouping>)`	A class to group movement data
Time management
`t1()` `t2()`	Functions to get start and end points of an sftrack object.
`make_timestamp()`	Make timestamp object from a vector of time
`t2_by_group()`	Calculate t2 based on groupings
`sft_time()`	A class to store time and time intervals
`time_recalc()`	recalculate time objects from t1
Working with geometries
`make_step_geom()`	Calculate step geometries given a set of groupings, time, and geometries
`merge_traj()`	Merge connected lines and create an sf object
`step_metrics()`	Calculates step metrics including distance, dt, dx, and dy.
`step_recalc()`	recalculate step geometry
`pts_traj()` `coord_traj()`	Return a list of sf_POINTS or a data.frame from a sftraj object
Datasets
`raccoons`	Movements of two raccoons in Tree Tops Park, Florida

Reference

Creation/conversion

Data checks and fixes

Plotting

Group management

Time management

Working with geometries

Datasets