Model of backwards base state with amendments based on event and version management
Xiaoya Liu · Journal of Zhejiang University(Science Edition) · 2014
Low redundancy storage and high spatial-temporal operation efficiency of spatial-temporal data is a contradiction is TGIS.Researches of base state with amendments and its extensions are made to reconcile the contradiction.This paper proposes a variant of base state with amendments on spatial-temporal data model,which achieves reverse base state with amendments by event and version management.The model always puts the current data as the base state,and makes a record of each change variables by event management.It marks the spatial-temporal state of geographic objects with version management which can make a complete record of the spatial-temporal evolution of geographic objects.And then,it adopts version mark and event to manage the lifecycle of spatial-temporal objects,acquiring the history state by reverse increment in the history operations.With the application in Land Use Current Data Change System,it shows that this model is easy and convenient to realize history trace and change back of geographic objects by event and increment,and to obtain history state instantly by version mark.