Study On Forest Resource Spatial Data Updating Model Basing On Temporal-GIS

Temporal GIS(TGIS) is one of the important domains in the GIS research. It has also become the hot spot that people always study. Forestry resources spatial data is that related data which has characteristic of space geometry. The updating technology for it is far behind the practice needs. Aiming at this actuality, the paper is to seek an effective updating model combined with TGIS.The sub-compartment is the basic unit of forest resource investigation and management among forestry resources. Taking it as the main research object, at the same time introducing the time factor, the paper establishes a data updating model based on TGIS The model is objective to improve the updating rate, and realize the historical query of forestry resources spatial data.In theoretical study, the paper firstly has analyzed the changes of forest resources spatial data and understood those changes are due to reasons such as natural growth of trees, disasters, legal and illegal human activities and the survey error. According to the variation of space and attributes, the variation type of sub-compartment is divided into eight basic ones. Secondly, it describes temporal and spatial information of sub-compartment updating by the method of Object-Oriented and TGIS, and establishes spatio-temporal data logical model. Then, it improves and extends the traditional Base-State with Amendments to determine data structure of spatio-temporal data.. On this basis together with version management, it structures a new spatio-temporal data model named Version-Based Multi-Base State Extended Spatio-Temporal Data Model with Amendments which is short for VBMBSEA-STDM. Lastly the paper has a systematic description of model mainly about the three aspects:data structure of sub-compartment, basic spatial operation of sub-compartment and data storage of sub-compartment.In technical practice, on the basis of the study, it reaches the specific changes form of sub-compartment data by analyzing the data of Liangshui experimental forest in1999and2009,and set up experimental system for forestry resource spatial data updating. It put experimental data into spatio-temporal database. After the following steps, it realizes the operation of creating, splitting,union of sub-compartments,and spatio-temporal query.