track: Create a `track_*`

Description

Constructor to crate a track, the basic building block of the amt package. A track is usually created from a set of x and y coordinates, possibly time stamps, and any number of optional columns, such as id, sex, age, etc.

Usage

mk_track(
  tbl,
  .x,
  .y,
  .t,
  ...,
  crs = NA_crs_,
  order_by_ts = TRUE,
  check_duplicates = FALSE,
  all_cols = FALSE,
  verbose = FALSE
)
make_track(
  tbl,
  .x,
  .y,
  .t,
  ...,
  crs = NA_crs_,
  order_by_ts = TRUE,
  check_duplicates = FALSE,
  all_cols = FALSE,
  verbose = FALSE
)
track(x, y, t, ..., crs = NULL)

Value

If t was provided an object of class track_xyt is returned otherwise a track_xy.

Arguments

tbl: [data.frame]
The data.frame from which a track should be created.
.x, .y, .t: [expression(1)]
Unquoted variable names of columns containing the x and y coordinates, and optionally a time stamp.
...: [expression]
Additional columns from tbl to be used in a track. Columns should be provided in the form of key = val (e.g., for ids this may look like this id = c(1, 1, 1, 2, 2, 2 for three points for ids 1 and 2 each).
crs: [crs]
An optional coordinate reference system of the points. Usually just the epsg code is sufficient.
order_by_ts: [logical(1)]
Should relocations be ordered by time stamp, default is TRUE.
check_duplicates: [logical(1)=FALSE]
Should it be checked if there are duplicated time stamp, default is FALSE.
all_cols: [logical(1)=FALSE]
Should all columns be carried over to the track object, default is FALSE.
verbose: [logical(1)=FALSE]
Inform when tracks are created.
x, y: [numeric]
The x and y coordinates.
t: [POSIXct]
The time stamp.