地球信息科学学报

地球信息科学学报 ›› 2015, Vol. 17 ›› Issue (7): 765-773.doi: 10.3724/SP.J.1047.2015.00765

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资源环境综合科学调查多级格网系统的设计

贲进1,2(), 周成虎2, 童晓冲1, 张勇1, 康宁3, 王卷乐2   

  1. 1. 信息工程大学地理空间信息学院,郑州 450052
    2. 中国科学院地理科学与资源研究所 资源与环境信息系统国家重点实验室,北京 100101
    3. 61683部队,北京 100094
  • 收稿日期:2015-01-04 修回日期:2015-01-28 出版日期:2015-12-10 发布日期:2015-07-08
  • 作者简介:

    作者简介：贲 进(1977-),男,博士,副教授,研究方向为空间数据模型、数字摄影测量。E-mail: benj@lreis.ac.cn

  • 基金资助:
    国家科技基础性工作专项(2011FY110400-1);国家自然科学基金项目(41171307、41271391);中国博士后基金项目(2013T60161);资源与环境信息系统国家重点实验室2013年度开放基金项目

Design of Multi-level Grid System for Integrated Scientific Investigation of Resources and Environment

BEN Jin1,2,*(), ZHOU Chenghu2, TONG Xiaochong1, ZHANG Yong1, KANG Ning3, WANG Juanle2   

  1. 1. Institute of Surveying and Mapping, Information Engineering University, Zhengzhou 450001, China
    2. State Key Laboratory of Resource and Environmental Information System, Institute of Geographic Science and Nature Resource Research, CAS, Beijing 100101, China
    3. 61683 Troops, Beijing 100094, China
  • Received:2015-01-04 Revised:2015-01-28 Online:2015-12-10 Published:2015-07-08
  • Contact: BEN Jin E-mail:benj@lreis.ac.cn
  • About author:

    *The author: SHEN Jingwei, E-mail:jingweigis@163.com

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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。

关键词: 资源环境, 综合科学调查, 多分辨率, 格网, 编码

Abstract:

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, geographic grid system is not only a geospatial framework, but also a model for geographical feature expression. According to the needs of data management and sharing in integrated scientific investigation of resources and environment, 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 between 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 management named GridVis 1.01 is developed to validate the feasibility of the proposed schema. Experiments on the real-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 administrative region data of China, the GTOPO 30 digital elevation model of China, and the 1 km spacing national vegetation cover data of China respectively, the frame refresh rate is 33~52 frames/second (FPS). When the 10-minutes-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 used to match the 1 km spacing population data of Ansai county (which locates within Yanan city of Shanxi province), the average frame refresh rate is 50 FPS. All the experimental results suggest that the proposed schema could satisfy the demands of real-time applications.

Key words: resources and environment, integrated scientific investigation, multi-resolution, grid, encoding