【摘要】 基于长期在多个省区进行林业应用开发的经验积累,结合甘肃省掌上森林资源GIS系统的项目开发实践,探讨了基于PDA(Personal Digital Assistant)的森林资源嵌入式GIS系统矢量图形编辑功能的实现。通过构建适合嵌入式环境的数据模型和优化算法,实现了多点、多线、多面、孤岛、环、带多洞等复杂图形的拓扑处理和图形编辑;提供了图形编辑的UnDo撤销、Redo恢复及自动备份功能。有效解决了嵌入式GIS图形显示编辑的精度、效率以及操作便捷、系统稳定等问题。更多还原

【Abstract】 Based on the experiences accumulated from long-term applications and developments of forestry industries in quite a few provinces,and combining the project development practices on Gansu Province Forestry Resource GIS System on PDA,in this paper we discuss the implementation of the vector data graphics editing function of PDA-based embedded forestry resource GIS system.By constructing appropriate data model and optimisation algorithm of the embedded environment,we achieve the topology processing and graphics editing on complex graphics with multi-point,multi-line,multi-facet,islands,ring,or graphics with multi-hole,etc.We also provide the functions of Undo revocation,Redo restoration and automatic backup for graphical editing.The research brings forward an effective solution to embedded GIS graphics editing in accuracy,efficiency and easy operation,as well as the system stability and so on.更多还原