Knowledge Systems Laboratory, Stanford
University
17
Time Granularity
uTime cannot be measured with infinite accuracy
uNeed a notion of “abstracted” time points
E.g., 1984, May-1927, 12:50 p.m. February 14, 2000
„Time intervals
are not sufficient
uSpecify a granularity for a time point
„Provides
for uncertainty that a point occurs somewhere in a certain time interval
E.g., The time point 1984 at granularity “year” occurs somewhere during the convex interval 1984