8Yuan L W, Yu Z Y, Chen S F, et al. CAUSTA: Clifford algc- bra based unified spatial-temporal analysis[J]. Transac- tions in GIS, 2010,14(S1):59-83.
9Fana Y T, Yanga J Y, Zhu D H, et al. A time-based integra- tion method of spatio-temporal data at spatial database lev- el[J]. Mathematical and Computer Modelling, 2010, 51 (11-12):1286-1292.
10Peuquet D J. Representations of space and time[M]. New York/London: The Guilford Press, 2002.
