ISPRS, Vol.34, Part 2W2, “Dynamic and Multi-Dimensional GIS”, Bangkok, May 23-25, 2001
fundamental spatial knowledge as well as metrical knowledge. In
fact, gradual changes of spatial relationships have been studied
by H. Bruns and M. Egenhofer (1996). To develop a
semantically rich spatio-temporal database system, a part of
farther work is to formalize changes qualitatively or
quantitatively, and to implement spatio-temporal semantics
explicitly with data structures and implicitly with data operations.
ACKNOWLEDGEMENTS
This work is jointly supported by National Natural Science
Foundation of China (NSF 60003012, NSF 69833010) and
Foundation of an Industrial Research Chair in Geomatics at
Laval University of Canada.
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