A Method of Qualitative Change about Spatio-temporal Object Based on Similarity Theory
Zheng Chunyan · Geography and Geo-Information Science · 2010
Considering change cognition is relative to the ability of dealing with spatio-temporal information for model,utilizing qualitative change information about a sptio-temporal objects to distinguish the change degree is subjective,and lack of effective ability for managing the change information,a method is proposed to express change degree quantitatively by utilizing similarity theory in this paper.By computing the similarity degree value between objects in different periods,we can judge weather the change is a′quantitative change′ or a′qualitative change′,and in the method,combing the similarity elements computed in the system,spatial change type of an object can be recognized,and the kindred of an object are distinguished if it occurs a qualitative change.By the method,it is can be chosen to build a new version for an object or to store it as a new object in database by the change degree of a geographical entity.The change type can be confirmed,which is the foundation of storing spatio-temporal object and tracking spatio-temporal process