Description Usage Arguments Details References See Also
Calculate population density from count data using the gREM.
1 | gremDensity(z, alpha, theta, r, animalSpeed, t)
|
z |
Number of detections. |
alpha |
Call width in radians. |
theta |
Detector width in radians. |
r |
Sensor detection radius in metres. |
animalSpeed |
Average animal speed in metres per second. |
t |
Total survey time. This is the amount of time the sensors are active multiplied by the number of sensors used. |
Note that the REM of Rowcliffe et al. 2008 can be used by setting alpha to 2*pi and the Gas Model of Yapp 1956 can be used setting alpha and theta to 2*pi.
Lucas, T. C. D., Moorcroft, E. A., Freeman, R., Rowcliffe, J. M., Jones, K. E. (2015), A generalised random encounter model for estimating animal density with remote sensor data. Methods in Ecology and Evolution. doi: 10.1111/2041-210X.12346
Rowcliffe, J., Field, J., Turvey, S. & Carbone, C. (2008) Estimating animal density using camera traps without the need for individual recognition. Journal of Applied Ecology, 45, 1228-1236.
Yapp, W. (1956) The theory of line transects. Bird Study, 3, 93-104.
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