Please be aware that The dBBMM are computationally
heavy models. This means that they may kill your R session if
you try to perform these calculations for very long
study periods (e.g. 1 year of data across several individuals tracked).
To overcome this issue we developed the function
getAreaStep(), which allows RSP users to calculate the
dBBMM areas for pairs of groups
tracked, together with their corresponding overlapping
areas (in absolute values and relative frequencies). This
function currently only works with the 50% and 95%
contours (RSP default), and the calculations are performed
according to 1-day time steps (but can be defined using the
timeframe argument). The number of individuals detected
from each group of interest in each time step are also obtained.
Another issue with running the dBBMM is losing your
progress when the R session dies. To avoid this,
getAreaStep() will export the calculated areas to your disk
by default (save = TRUE) as it goes, and you can choose the
name and directory of the output file using the argument
name.new. In case your computer/R dies for any reason (bad
memory, power, etc.), you can always come back to where it stopped by
setting the previously exported ouput file (using the
name.file argument), setting another output name for the
new calculations (name.new), and defining the start date
from where to resume the area calculations (start.time
argument). For more details, see the example in
?getAreaStep.