Individuals Class consists of spatio-temporal parameters about exposed populations.Individual gets coordinates (as SpatialPoints), a date of birth, a life duration, an intern toxic concentration over the time and a toxic threshold (max value of toxic before death).
Each individual in an Individuals object is identified by an ID which is used as index to access attributes in the object.
ncoordinatexminxmaxyminymaxdoblife_durationintern_toxictoxic_thresholdmintimemaxtimesimulateIndividuals , loadIndividuals