Representation of Uncertain Objects and Research on Their Spatio-temporal Topologies
Su Fenzhen · Geo-information Science · 2009
Lags of researches on spatio-temporal topologies have seriously restricted the spatio-temporal reasoning and analysis.In this paper,uncertainties of space and time are discussed firstly,and an upper and lower approximate sets in rough sets theories are adopted to represent uncertain spatio-temporal objects.Then according to uncertainties of space and time,4 kinds of spatio-temporal objects are induced,and 10 kinds of topological frameworks between them are addressed.And based on the point-set theories,the Egenhofer's spatial topologies and the Shuhong's temporal topologies,a uniform description frame of spatio-temporal topologies expanded from the 4-intersection model is given.Furthermore,conclusions that topologies between type(I) and type(I) is the most basic spatio-temporal topologies,and that topologies between type(Ⅳ) and type(Ⅳ) is the most complex ones,and that others can be inferred from them are drawn.Finally,in views of complexities of uncertain spatio-temporal topologies,a universal flow of them is presented.