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  • 2002 Volume 4 Issue 3
    Published: 25 September 2002
      
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    ARTICLES
  • ARTICLES
    The Establishment of Land-use Spatial-temporal Database and Its Relative Studies in China
    LIU Jiyuan, ZHUANG Dafang, ZHANG Zengxiang, GAO Zhiqiang, DENG Xiangzheng
    2002, 4(3): 3-7.
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    In the mid-1990s, we established the national operative dynamic information systems on natural resources and environment. In the process of establishment of the land-use database, 520 scenes of remotely sensed images of Landsat Thematic Mapper (TM) were interpreted at scale of 1∶100 000 under overall digital software environment after being geo-referenced and ortho-rectified. The vector map of land-use in China at the scale of 1∶100 000 was recently converted into a 1-km raster database that captures all of the high-resolution land-use information by calculating area percentage for each kind of land use category within every cell. Being designed as the operative dynamic information serving systems, monitoring the change in land-use/land-cover at national level was executed. We have completed the updating of LUCC database by comparing the TM data in the mid-1990s with new data sources received during 1999～2000 and 1989～1990. The LUCC database has supported greatly the national LUCC research program in China and some relative studies are incompletely reviewed in this paper.
  • ARTICLES
    The Pilot Study of Sustainable and Conservation Strategies: The Establishment of Conservation Corridor for Central Mountain Core
    KUO Monica, LEE Tienzen, WU Chaushiung
    2002, 4(3): 8-16.
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    The conservation planning results of this project led to the establishment of the guidelines for zonal planning of the Central Mountain Greenway based on IUCN guideline of conservation planning. These guidelines could be used as the basis of the Central Mountain Conservation project and the references of developing process of Digital Taiwan Model. Digital Taiwan is an article, multi-directional and metadata technology convoluted from traditional spatial information and political management to overcome time-consuming planning, management and decision support. As a result, this study tries to establish the Digital Taiwan Model by using GIS and RS as the Land Planning tool to correlate the existing digital data of land resources, and apply the concepts of "Environment resources sustainable development", "Environmental costs", and "Bio-diversity conservation". This study will serve as pilot reference for executing the land planning and land planning decision-making support system.
  • ARTICLES
    The Design of Middleware-Based Grid-GIS
    LUO Jiancheng, ZHOU Chenghu, CAI Shaohua, PEI Tao, ZHANG Jiang, LU Xuejun, GONG Jianhua
    2002, 4(3): 17-25.
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    Based on the framework of Grid-Computation and Spatial Information Grid(SIG), this paper proposes a new kind of Middleware-Based Grid-GIS, which can utilize all the spatial data, analyztical software and computation environment as its sharing resources, and approach the infrastructure, the organizational system and the implementation pattern of its. In addition, some key frontier techniques including how to implement Federated Spatial Database, to realize spatial computation environment and virtual geo-environment based on the middlewares are also discussed.
  • ARTICLES
    Probe into Network Oriented Large-scale GIS Platform Structure
    LU Feng, ZHOU Daliang, GUO Chaozhen, XIE Kunqing, LIU Renyi
    2002, 4(3): 26-34.
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    The state-of-art GIS platforms and application development is firstly analyzed in this paper and the necessity of developing independent copyright large-scale GIS platforms to support China's national spatial infrastructures is confirmed. Secondly the general aims and technological aims are put forward. Then the system structures and characteristics of large-scale distributed GIS are discussed in detail from the hierarchies of general framework, spatial database management system, spatial application service platforms and visual GIS tools and application interfaces.
  • ARTICLES
    Study and Application of Network-based Integrated Management Model of Resources and Environment Metadata
    WU Hongqiao, HE Jianbang, CHI Tianhe, HUANG Yuxia
    2002, 4(3): 38-42.
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    There are some difficulties in sharing of resource and environmental information because of their multi-scope, multi-species, multi-significance and large data. Metadata is an important and efficient means for solving the problem. This paper has analyzed the current managing models of metadata of resources and environment. Subsequently, it discusses constructing a network-based, open and extendable metadata database management system and carrying out a management model of trinity of data users, metadata and datasets. Finally, a metadata management software MMT-1 has been completed by some advanced developing means and successfully applied.
  • ARTICLES
    Ground Simultaneous Measurements and Analysis of Radiometric Characterization of Dunhuang Test Site for Calibrating CBERS-1 Sensors
    MIN Xiangjun, WANG Zhimin, FU Qiaoyan, GU Yingqi
    2002, 4(3): 43-50.
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    The Dunhuang test site is situated in the northwest corner of the Gobi desert near the city of Dunhuang. The calibration area is (400×400)m 2 and situated in the centre of a relative homogeneous and flat zone of (30×40)km 2. During August to September, 2000, China Center for Resources Satellite Data and Application (CRESDA) conducted a field measurement campaign for determining the characteristics of the ground reflectance and of the atmosphere. The results show that the test site has a very good homogeneity with a variation coefficient of the reflectance in any channel lower than 3%. The ground reflectance increases progressively from 0.18 at 485 nm to 0.26 at 830 nm. Atmospheric measurements show that at 0.55 μm the total atmospheric optical depth (about 0.34) and the aerosol optical depth (about 0.26) are relatively low and the effect of atmospheric water vapour content is also relatively small. These preliminary results show that the selected test site is well adapted to the absolute radiometric calibiration of in-flight satellite sensors such as CBERS-1 CCD.
  • ARTICLES
    The Theoretical Foundation of Map Digitization and Its Application in World Map Digitization
    YANG Xiaomei, YANG Song
    2002, 4(3): 51-54.
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    Maps as being the most fundamental and essential data sources of database as well as GIS and RS, data precision of map digitization has become a matter of common interest to all related disciplines. In this paper, we define the theoretical foundation of digitization, discuss in detail two commonly used data acquiring models, introduce the composition of our digital system for world map, finally we focus our discussion on the principles and methods of probing the mysteries of map. Generally, this paper aims at creating the theoretical foundation of map digitization and improving data precision of map digitization.
  • ARTICLES
    A Study on Improving the Power of Expression of Graphic Symbols in Quantitative Map
    ZHANG Junhai, HU Wenliang, LI Renjie, YIN Xiaoying
    2002, 4(3): 55-58.
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    This paper expounds the concept and research significance about the quantitative map,and,proceeding from the graphic symbols,analyses the visualizing variable of symbols and puts forward that improving the expression of graphic symbols should be started with map designing in two ways: the expressiveness and the attractiveness of improving the expression of data content by symbols. The expressiveness of symbols includes three aspects: readability, sequency and information capacity. As for the attractiveness, symbols should be designed in aesthics, three-dimension, dynamics, figurativeness and perspective from the point of view of vision to enhance the visualization of the map. The graphic symbols of the degant quantitative map should posscess the higher expression and the perfect unity of the expressiveness of content and the attractiveness of symbol figure.
  • ARTICLES
    The Experience of Data Development for Guangzhou Urban Planning Information System
    DUAN Xinmin
    2002, 4(3): 59-63.
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    Four topics will be discussed in this paper: (1) data in an urban planning system; (2) analysis on the urban planning and the spatial data; (3) data organization in Guangzhou Urban Planning Information System; (4) experience of data development in urban planning system.
  • ARTICLES
    Data Revision of Digital Town
    QIAN Yuhua
    2002, 4(3): 64-67.
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    This paper discusses the necessity of data revision of Digital Town. The main types of data revision and application technical ways are brought up. It is pointed out that attention must be paid to information maintenance, operation and data revision. Finally the author focuses on integrated low altitude platform by Beijing Keyuan Dadi Center of Remote Sensing including light aircraft,remotly controlled small aircraft, airship and fire ballon will be acted on geographic data revision of Digital Town.
  • ARTICLES
    Design and Application of Internet Based Environmental Information System-A Case Study in Yili Prefecture
    DENG Xiangzheng, ZHUANG Dafang, ZHAN Jinyan, ZHAO Tao, HU Yunfeng, XIA Chaozong
    2002, 4(3): 68-73.
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    With the development of Internet technologies, Internet based information system arises with more advantages: Firstly, it is convenient for users to use owing to the introduction of Internet technologies. Secondly, it benefits greatly the data dissemination and data sharing based on Internet. The most important but not the last is that users can establish the information service network supported by its technologies and the facilities of information highway. So, it would be significant to design Internet based information system to realize data collection, sharing and dissemination on Internet. There are many factors affecting regional environment. So it is not easy to realize the integrated environmental monitoring. Given this, we designed the Internet based environmental monitoring information system. By the virtue of the Internet based environmental monitoring information system, the management and storage of environmental monitoring data would be easier, which lays the foundation for the actualization of the environmental monitoring efficiently.
  • ARTICLES
    Application of Digital Mapping Technology in Planning of Land Exploitation and Arrangement
    DONG Tingxu
    2002, 4(3): 74-78.
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    Digital Mapping Technology is one of the functions of MAPGIS.The autor investigated and analyzed the requirement of mapping for land exploitation and arrangement planning. In this article there is a technoloical line on land exploitation and arrangement with MAPGIS.
  • ARTICLES
    The Research of Tour Expert Information System Based on ComGIS——Taking Changping District as an example
    CHEN Yingbiao, ZHONG Er'shun, QIAN Qinglan
    2002, 4(3): 79-84.
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    The paper mainly points out that tourism as a rapidly developing industry, it also has many disadvantages, for example its information level is low and spatial information application is inadequate. The author suggests to apply GIS technology and expert system to tourism information system by taking Changping District of Beijing city as an example. It also conducts a theoretical discussion of combining GIS technology with expert system to build tourism information system.
  • ARTICLES
    3S" Based Ecological Environment Dynamics Monitoring System Along Yanhe River in Shaanxi Province
    ZHANG Wen'an, MA Heping, SHEN Ping, GUAN Haiyan
    2002, 4(3): 85-88.
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    In this article, the author explains that through RS, GIS and GPS core techniques, as well as ground test with synthetic investigation method, they have completed background investigation of ecological environment along Yanhe River, whose coverage is about 10 015 797 km 2, and have established 1900～2000 year ecological environment dynamics monitoring system by using ETM/TM satellite data and airborne to ground observation data. Up to now, they have found out the distribution of major species and vegetation, current status of land use and coverage and their dynamics changes in the last ten years. They have also identified 5 ecological regions and 25 ecological systems. At the same time they put forward the proposals and actions for ecological environment establishment, soil erosion control, economic development, and realization of sustainable development.