中文摘要：

地理格网系统借助特定方法将地球表面均匀剖分,形成无缝无叠的多分辨率格网层次结构。它既是一个空间框架,又是地理特征表达的一种模型。本文结合资源环境综合科学考察数据管理与共享的需求,深入分析了＂地理格网＂国家标准,指出其在多分辨率应用中存在孔径过大且不一致的问题。鉴此,将度与分、分与秒之间的进制在逻辑上由六十扩展为六十四,进而实现严格的四叉树剖分,直至秒级以下更高分辨率格网采用2的负指数幂表示。根据剖分特点,设计了兼容国标的编码扩展方案。在此基础上开发了多级格网生成与管理原型系统,通过资源环境综合科学调查数据三维实时浏览实验,验证了格网剖分编码方案的可行性和正确性。

英文摘要：

Geographic grid system is a set of related global grids at various scales which tessellate the earth into a hierarchy of areal cells and associated cell points. As a frontier research of geographic information science, geo- graphic grid system is not only a geospatial framework, but also a model for geographical feature expression. Ac- cording to the needs of data management and sharing in integrated scientific investigation of resources and envi- ronment, this paper presents a detailed analysis on Chinese national standard of geographic grid. We discover that according to the standard, the apertures of grids are sometimes too large and incongruous, when they are used in multi-resolution applications. In order to making up the inadequacies, the paper extends the radix be- tween one degree （minute） and one minute （second） from 60 to 64 in logical space, where a formal quadtree-like recursive subdivision can be implemented until the one second grid is reached. Grids finer than one second can also be subdivided in a similar manner and be expressed by taking the negative exponentials of 2 as the interval. The paper also designs the extension encoding scheme for quadtree-like grids, so that it could be compatible with the existing national standard of geographic grid. A prototype of multi-level grid generation and manage- ment named GridVis 1.01 is developed to validate the feasibility of the proposed schema. Experiments on the re- al-time 3D visualization of various resources and environmental data are designed to examine the frame refresh rate of the scenes in GridVis. When the 1-degree-grid is used to organize the national 1：250,000 county adminis- trative region data of China, the GTOPO 30 digital elevation model of China, and the 1 km spacing national veg- etation cover data of China respectively, the frame refresh rate is 33-52 frames/second （FPS）. When the 10-min- utes-grid is used to organize the 1 km spacing national land use data, the average frame refresh rate is 30 FPS. When the 1 km grid is