Description Usage Arguments Details
Creates a capture history object to use with the function
admbsecr
.
1 | create.capt(captures, n.traps = NULL)
|
captures |
A data frame of capture records, see 'Details' for the correct format. |
n.traps |
The total number of traps. If |
The captures
argument to this function is intended to be of
a similar format to the captures
argument to
make.capthist in the secr package. That is, users can
use the same captures
data frame with create.capt
and
make.capthist
, which generate capture histories for use with
the admbsecr
and secr packages respectively.
As such, the second and fourth columns should provide the ID of the
detection and the trap number of the trap which made the detection
(where the trap number is the row number of the corresponding trap
in the matrix of trap locations). Note that the first and third
columns provide the 'session' and 'occassion' of the detection for
make.capthist, but as the admbsecr package does not
presently have the capabilities to deal with multi-session or
multi-occassion data, these columns are ignored by
create.capt
.
Additional optional columns can specify the additional information collected over the course of the survey:
A column named bearing
containing estimated bearings
from which the detector detected the individual.
A column named dist
containing the estimated
distance between the individual detected and the detector.
A column named ss
containing the measured signal
strengh of the detected acoustic signal (only possible when
detectors are microphones).
A column named toa
containing the measured time of
arrival (in seconds) since the start of the survey (or some
other reference time) of the detected acoustic signal (only
possible when the detectors are microphones).
A column named mrds
containing the known (not
estimated) distance between the individual detected and the
detector.
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