区域森林资源可持续水平评价系统研建

【作者】 马凯；

【导师】 李际平；

【作者基本信息】 中南林学院 ， 计算机应用技术， 2004， 硕士

【摘要】 区域森林资源可持续水平评价系统是区域森林资源可持续水平评价工作信息化、智能化的标志。本系统融计算机技术、GIS技术、人工神经网络技术于一体，利用MAPGIS的二次开发耦合GA_BP评价网络模型，本着充分利用现有各区域的林业空间数据库信息的思想，实现了评价工作的实时化、动态化。 本文中率先提出区域森林资源可持续水平评价的智能化、信息化问题，改变了目前人们对此问题的解决模式，并提供了一个应用评价平台，并在区域森林可持续水平评价领域首次引入了GA_BP模型：在评价指标方面实现了智能提取和归一化，以及评价指标的灵活选取功能，实现了评价自主化原则，做到“因人而异、因地制宜”—即可根据评价者所关心的问题域来动态选取评价指标，可根据当地具体情况具体分析，最大程度的体现了评价平台与用户的互动性；耦合了GA_BP模型与GIS，建立了评价系统，利用VC++以及基于VC++的MAPGIS二次开发，实现了系统的设计；实现了评价结果表达的自然化，即以三原色立体坐标空间来描述系统的可持续水平，其中红色值代表社会指标体系、绿色值代表生态指标体系、蓝色值代表经济评价结果；实现了评价数据管理的信息化，根据各区域情况实时变化，数据库实时更新，评价结果也相应的更新，方便实现跟踪评价。 本系统开发严格遵照软件工程的方法和把评价工作视为一个系统工程的思想，采用面向对象技术和基于MFC类库的MAPGIS二次开发方法。首先，在文中的第一部分指出了该项研究的内容和进行该项工作的意义所在；接下来对评价系统的用户需求、功能需求以及系统结构模块进行了详细的分析，指出了系统开发的策略、方法以及系统运行的环境；在文中的第三部分对所要使用的评价模型的应用可行性进行了说明，并得出了应用结合GA_BP模型作为评价模型的结论，进而给出了区域森林可持续GA_BP评价模型的设计，以及对模型中功能划分、各模块的功能做了介绍，并给出了系统设计的各模块应用界面。 文中的软件设计与实现部分描述了系统从概念设计到具体设计实现数据管理、系统的空间设计分析与管理、系统的属性数据管理、GA_BP评价模型的实现与评价结果的表达各个预定功能模块的过程；最后，利用实例对系统的功能进行了验证并取得了比较满意的结果。在结束语中笔者分别对所研建系统的创新点、缺点以及以后的发展方向做了说明。更多还原

【Abstract】 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.更多还原