The three metric functions take an optional unit argument. For areas: km2 (default), m2, or rads2. For lengths: km (default), m, or rads. Passing an area unit to a length function (or vice-versa) raises an error.
Return the temporal area of each cell in a trajectory, in the requested unit
th3CellArea(th3index,text='km2') → tfloat
Return the temporal length of each directed edge in a trajectory, in the requested unit
th3EdgeLength(th3index,text='km') → tfloat
Return the temporal great-circle distance between two temporal geodetic points (not between cells). The two operands are synchronised.
greatCircleDistance(tgeogpoint,tgeogpoint,text='km') → tfloat