track {amt} | R Documentation |
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)
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.
|
Value
If t
was provided an object of class track_xyt
is returned
otherwise a track_xy
.
[Package
amt version 0.2.2.0
Index]