© 2002 5
3D conceptual model extended by time
-- database type MovingVertex
lTime isomorphic to the reals
uLocation and shape of geometries is a function of time
lVertices move on their trajectories
l
l
lProperties of the model:
uTrajectory piecewise linear
uChange in direction => Snapshot
uLinear interpolation also w.r.t. time
u => const velocity/no acceleration
u Change in velocity => Snapshot
l
l
x
y
t
30
10
25
20
interpolated