| The evaluation system of regional forestry resources sustainable level marks the informationizatton and intellectualization of the evaluation work in this field. Merging computer technology and GIS techniques with the artificial neuro-netmork skills and utilizing the secondary development of MAPGIS coupled with the model of GA-BP appraisal network, the system makes the real-time process possible and the evaluation work dynamic in time with the concept of making full use of the present information of each regional forestry space database.Being the first to put forward the matter of the informationization and intellectualization of regional forestry sustainable level evaluation and intellectualization of regional forestry sustainable level evaluation and introduce GA-BP model to it, this paper changes the existing mode which people use to solve the problem and provides a platform for application evaluation. By realizing the unity and artificial withdrawal as well as the flexible selection function of the evaluation indices, the system carries out the principle of being independent. It succeeds in varying with each individual and being in liae with local conditions.i.e. Dealing with concrete problems according to specific situations and choosing evaluation indices dynamically on the ground of the questions that the evaluators are widely concerned about. Thus it reflects the maximum interaction between the evaluation platform and its consumers. The evaluation system is constructed through coupling GIS and GA-BP model and by utilizing VC++ to design the system. As a result the evaluation outcome can be expressed naturally. That is to describe the sustainable level of the system through using a three-dimensional coordinate space in three primary colours, with the value in red standing for social index system, the value in green referring to ecological index system and the value in blue representing the outcome of economic evaluation respectively. Consequently the informationization of the evaluation data management is fulfilled. At the same time the real-time renewal and the renewal of the evaluation result are achieved on the basis of the real-time variation of each region, whkh makes it convenient to realize tracing evaluation.The exploration of this system is in strict accordance with the software project made and treating evaluation work as a systematic project. Based on the MAPGIS secondary development method of the database of MFC kind, it adopts the facing object techniques. Accordingly, this paper faHs into the following pants. First, the content of this research and its significance are presented; Secondly, detailed analyses on the demand of consumers, the functional demand and the structural model of the system are made. Also the development strategy and methods of the system as well as the environment in which it can operate are pointed out; Thirdly, instructions to the applied feasibility of the model is given. It includes by saying that GA-BP model can be combined and used as evaluation model. In the fourth part, the design of GA-BP evaluation model is illustrated. Then the functional division of the model and the function of each part are mentioned. The application interface designed by the system of each part is also discussed. In this paper the design and realization part of the software elaborates on the system from its conceptual planning to concretedesign which carries out the management of data, the management and analysis on space design of the system, its property data management, the realization of GA-BP evaluation model and the process of each predetermined functional part expressed as evaluation outcome. Finally, an example is used to verify the function of the system and a comparative satisfactory outcome has been obtained. To conclude, the author focuses on the originality, drawbacks and the direction in which the system constructed will develop. |
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