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  • 2004 Volume 6 Issue 1
    Published: 25 March 2004
      
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  • ARTICLES
    System Theory of Geographic Science and Its Significance in Modern Economic Development-Taking the Yangtze River Delta as a Case
    REN Mei'e
    2004, 6(1): 1-3.
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    This paper discusses the difference between the system theory of geographic science and the theory of man-land relationship of previous geography, the different points include the following: ①the geographic science system emphasizes the man-land interactions;②the geographic science system identifies research scope covering the past, present and future;③the geographic science system can be applied either to an individual country and region or to global change study. Meanwhile, it also expounds the significance of geographic science system in modern economic construction.
  • ARTICLES
    The Cognition and Practice of Geo-information Science
    CHEN Shupeng, CHEN Xing
    2004, 6(1): 4-10.
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    The research objective of Geo-information science is human intelligence sphere and its main task is to control and adjust man-land relationship of human flow, material flow and energy flow with information flow for the purpose of serving peace and development. This paper discusses the theory and practice of Geo-information science by making penetrating analysis of the examples. It then suggests to understand the nature, master the law of nature, inverse the past and predict the future by using Geo-information Tupu. Finally, it calls for the GIS world to introduce network computation technique as early as possible so as to promote development in Geo-information science.
  • ARTICLES
    On Establishment of Hydroinformatics Subject in China
    LU Jingxuan
    2004, 6(1): 11-13.
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    A new interdisplinary subject called as Hydroinformatics was emerged in Europe in the early 1990's.It was resulted from the merge of traditional water science and modern information technology. It has developed very fast in the ten years time and is now well accepted all over the world. China is now in the transition period from engineering-based traditional water resources to management-based modern water resources. The infor-mationalization process of water resources in China has been remarkably accelerated in recent years. Various new concepts, such as digital water resources and digital watershed, have been proposed and many sophisticated information systems have been built in China′s water sector. We are now working towards industrialization of the water sector driven by information technology, which requires the development of our own hydroinformatics subject. Theoretical and technical studies of hydroinformatics are still very weak in China. There are yet no any universities opening hydroinformatics course, no formal acdemic journal of hydroinformatics, and no any relevant acdemic societies. The paper introduces the concept of this new subject and reviews China′s recent development in this field. Finally the paper strongly suggests to establish our own hydroinformatics subject system including its education, research, application and consultancy as well as journal publication and acdemic society. By doing so it is aimed to promote the theoretical preparation for further and sustainable development of China′s information technology in water resources.
  • ARTICLES
    An Archaeological Study of the Location of East Mountain Mentioned in Records of Mountains and Rivers
    LIU Shuren
    2004, 6(1): 14-16,48.
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    Records of Mountains and Rivers is a classical geographical book. West Mountain, South Mountain, North Mountain and Middle Mountain referred to in "Wu Zang Shan Jing" are all located in mainland China, except East Mountain for correlated records haven't been found in ancient books in the past 3000 years. Henrieffe Mertz, an American woman scholar, approved that overseas portion of East Mountain is located in America unexpectedly in her book of "Palegnk-Toso Oreient Records of Chinese Exploration in America"(1953), including Rocky Mountain, Nevada Mountain, Casketed Mountain and Coast Mountain. The distance among them, the number of apices, and species of their plants and animals are basically the same with those mentioned in Records of Mountains and Rivers. In masterstroke of the book she writes down"Records of Mountains and Rivers-Indian People-Effect of China-America-Discovery and Exploration of Chinese". It is emphasized in epilogue. "We have to show our respect for fearless Chinese, who were pedestrian to America across thousands of snow mountains and sheer apices 4000 years ago".
  • ARTICLES
    Key Technology of Implementation of Computing Node Software for Parallel Processing of Raster Data
    FANG Jinyun, HE Jianbang
    2004, 6(1): 17-21.
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    Sharing image processing environment(SIPE),which includes the technologies such as sharing memory, sharing processor, sharing hard disk, sharing display in a cluster computing node, and remote image objects innovation in computing nodes,is presented as a development/deployment environment and integration framework for distributed image processing and sharing application. It incorporates common sharing cooperation function services for developers to facilitate developing new application and integrating existing ones. The architecture of Spatial Information Grid(SIG) is also presented in this paper. SIPE also provides a reference mode and architecture that defines relationships between service components within SIPE, allowing them to seamlessly work together. Specialized SIG systems can be built by integrating domain-specific tools into SIPE to shorten development cycle and reduce cost.
  • ARTICLES
    Data Information Publishing in Grid-GIS
    SUN Qinghui, LUO Jiancheng, ZHOU Chenghu, CAI Shaohua, CHEN Qiuxiao, ZHENG Jiang, SHEN Zhanfeng, MING Dongping
    2004, 6(1): 22-27.
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    Data information publishing in Grid-GIS, one of the key technologies of Grid-GIS realization, is publishing the stored data information in GIS database with the means of Grid. It has such characters as all-purpose in realization, high-powered in publishing, easy-realization and publishing software reuse. Data information publishing in traditional WebGIS is realized by ways of CGI, API, JDBC, ASP, JSP etc. Any one of this methods has it's deficiency in publishing, such as it's heavily relying on the Web server makes Web server heavily laden, low intelligence, and difficulty to realize in heterogeneity database. Software Agent as an intelligent software, can continuously and independently work in the Web. Middleware is also a software which has such characters as standard communication protocol, distributed computing and transparent manipulation of Web, hardware, and software systems. So it can meet the need of highly computing and independence of hardware and operation system. Agent and Middleware provide basis for of the Grid-GIS realization. In this paper, the character of data information publishing in Grid-GIS was discussed. According to the characters of Grid-GIS, a new method, using the Agent and Middleware to realize the publishing of data information,was also discussed. In order to achieve this purpose the authors design such Agents as Login Manager agent, Grid-Web Interface agent, Messenger Agent, Task Manager Agent and Database Interface agent.
  • ARTICLES
    The Software Architecture of CoGIS and It's Research Topic
    CHENG Changxiu, ZHOU Chenghu, LU Feng
    2004, 6(1): 28-31.
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    GIS is evolving into a heterogeneous, distributed and loose-coupled environment. There has been a strong expectation for the GIS platforms and applications to support collaboration. But the existing GIS software seldom sees the powerful capability to make it. Referencing the development trends of the computer support cooperative work, we set forward in this paper a system architecture for collaborative GIS. Compare with N-Tier architecture, it puts more emphasis on the collaborative logic in every layer. Collaborative logic in different layers has different research topics. The main topic of collaborative logic in data service layer is to support concurrency access data under the environments of multi-user and multi-database, e.g. concurrency control of R-tree, spatial data phantom, and concurrency control on multi-user editing. It in business logic layer is to make resources in client and server use reasonably, e.g. load balance, message control, workflow control, and transaction management. It in presentation layer is to realize collaborative visualization, e.g. collaborative virtual geographic environments, cooperative mode of colony. The CoGIS is a new and important development direction of GIS. It is thus necessary to develop more methodologies and techniques to support CoGIS.
  • ARTICLES
    GML-based Distributed and Generalized Spatial Data Engine
    TANG Zhongshi, HUANG Junfeng, ZHU Liyun, KONG Lin, YIN Ping, HUANG Shuwei
    2004, 6(1): 32-35.
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    The article brings forward a kind of distributed and generalized spatial data engine (SDE) expressed by semantic object models, based on the resolution of GML criterion and the frontier research of spatial data engine. Supported by current large database platform and communication mechanism, we construct a fairly-new distributed and generalized SDE model by GIS language of semantic object. This paper gives a brief introduction to the application of the exploitation result and the direction for future development.
  • ARTICLES
    A Study on Update Technologies for Spatial Database
    PAN Yuchun, ZHONG Ershun, ZHAO Chunjiang
    2004, 6(1): 36-40.
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    Spatial database update is a matter of urgency, which will become the "bottleneck" to GIS application instead of spatial data production, hence it has become a focus in GIS research fields. The aim of this study is to provide reference to help solving the problem of spatial information update. In this paper, ways of land use spatial data update and the methods to achieve update are studied. Overlay analysis, spatial relationship between spatial entities and smart snap based on spatial analysis are the technical bases for spatial data update. Complete update and partial update are two main ways to spatial data update, and they have differences in many aspects, such as existing way of data sources for update, operational object, technologies for update and key technologies.
  • ARTICLES
    Implementation of the Fundamental Capabilities in ComGIS Based on VC++
    ZHAO Qiang, GONG Huili, ZHAO Wenji, DENG Wei
    2004, 6(1): 41-43.
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    ComGIS,is components of geographic information systems,is composed of a group of GIS components which conform to the "technical criterion" of COM(Component Object Model) and is based on the platform of component objects and can be applied to all programming languages,furthermore various computers.One GIS component can communicate with another through standard communication interfaces. At present, it is a mainstream in GIS technology. Visual C++, is VC for short. It is the heavy weight of programming language by Microsoft corporation with sufficient functions,being object oriented and visual.It is one of the most powerful popular programming languages at present, such as Visual C++, Visual Basic, Delphi, etc. But the research on the development of ComGIS is rarely carried out in VC++ programming language. The paper gives an example of the development of ComGIS in VC++. The map data is from the Shiyanghe river basin which is a typical inland river basin in northwestern China. The fundmental functions of GIS, such as built-in of GIS components, zoom, pan and refreshing of a map and so on have been discussed. The research in the paper gives scientific and referenced bases for the development of ComGIS based on VC++.
  • ARTICLES
    Researches and Application of Internet GIS Integrations Based on Web Service
    SONG Yachao, LV Guonian, ZHANG Hong
    2004, 6(1): 44-48.
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    Internet GIS is one of the most important developing directions of GIS,to build a practical internet GIS system, we must resolve the key technology of multi-source spatial data integration in the internet environ-ment,and spatial meta-data services in the internet environment. Web Service is a new technology in distributed computing domain,and an ideal model to implement inter-operation of different systems. We first made researches on the structure of internet GIS based on Web Service by comparing different computing models and different internet GIS software system structures,and provided a solution to Internet GIS application integration based on standard protocols such as XML, SOAP. Then,we studied the inter-operation of multi-source spatial data in internet environment, compared different multi-source spatial data integration solutions such as spatial data conversation, spatial data directing reading,and provided a new idea in multi-source spatial data integrations based on Web Service. In order to discover spatial data quickly in internet environment,we need a spatial meta-data system,and set up the spatial meta-data service system based on Web Services. The result indicated that spatial meta-data service system should be an essential part in internet GIS system structure. Finally, we introduced a practical example of internet GIS application based on Web Service, Nanjing "Digital House Property" internet GIS system. It is a mixture structure of GIS system,which was built in B/S part using Web Service technology and effective result was gained.
  • ARTICLES
    Spatial-temporal Data Model and Related Theoretic Issues
    FENG Kezhong, WAN Qing, LI Huiguo, MAO Guomiao
    2004, 6(1): 49-52.
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    Most of the geographical information systems are based on the static data model but with restrictions when they operate with dynamic information. Only the current status of an entity will be kept and the historical data will be lost during updating because the current GIS data model is lacking ability in tracking the evolution of an entity. We only know what it currently is, we know nothing about its past. The current data models that nowadays GIS use are nothing but snapshot data models.With the widespread use of GIS in many related geographic fields, people begin to realize that GIS should have ability to describe the spatiotemporal changes that are taking place every day in our world, so historical analysis could be achieved and even future evolution trend of phenomenon could be predicted. This idea brings forth the concepts of Spatiotemporal Geographical Information System(STGIS) and spatiotemporal data model(STDM).This paper reviews the progress that has been made in spatiotemporal data modeling. Related concepts have been introduced in details, technical issues in spatiotemporal data modeling and STGIS have been analyzed. Two main kinds of spatiotemporal data models are discussed, namely version-based spatiotemporal data models and object-oriented spatiotemporal data models. This paper points out that lack of a perfect spatiotemporal data model is a main obstacle in STGIS development and the basic requirements for a spatiotemporal data model has been investigated from system aspect and design aspect. Historical retrospect and time sequence description ability are the most essential ones among these requirements. This paper concludes that in spatiotemporal data modeling, object-oriented modeling method should be used and the implementation of such a spatiotemporal data model should be based on state-of-the-art database technologies.
  • ARTICLES
    Wetland Research and Monitoring in Beijing
    ZHANG Zhifeng, ZHAO Wenji, JIA Ping, XIE Zhiru
    2004, 6(1): 53-57.
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    First of all, supported by 3S technology, combining field investigations with indoor synthetic analysis, the types and area of wetland in Beijing were investigated and monitored.There are quite a number of types of wetlands with relative wide distribution, remarkable environmental difference and abundant bio-diversity.The main wetland types in Beijing include lakes, rivers, reservoirs, ponds, paddy fields etc., among them the area of artificial wetland is about 323 541.822km2, and that of natural wetland, about 138 214.740km2, accounting for 0.3% of the whole Beijing′s area. Secondly,dynamic change studies aiming at key reservoirs and typical wetland were made. The result of study shows that among the reservoir wetlands, the area of Miyun reservoir, Guanting reservoir and Huairou reservoir reduce separately 42.0%,23.9% and 4.9% compare with that of 1998 and changes of the landscape patterns of typical wetlands also take place correspondingly. It thus can be seen that the wetland area reduces and ecoenvironmental quality drops year by year in Beijing. Finally, we propose some constructive conclusions and suggestions according to current situation and problems existing in Beijing′s wetland. Thus the accomplishment of this scientific research item has laid the foundation for the further studies on the connection of wetland changes and climate, terrain and landforms, land use, vegetation change along with socio-economic development in the marginal area, and further analysis of the factors threatening the wetlands, evaluation of the current situation of ecoenvironment of the wetlands and putting forward measures protecting the wetlands in Beijing.
  • ARTICLES
    The Design of Flood Pre-warning Monitoring and Loss Evaluating System Based on GIS&RS and its Application in Shantou
    YANG Youlong, CHEN Zhiyuan, ZHAO Sijian
    2004, 6(1): 58-61.
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    New technologies promise reduced flood losses. However, real-time observations with vast multi-sensor networks, more precise mapping capabilities using remote sensing and GIS, quicker hydrological and meteorological models, and increasing forecast lead times have not yet resulted in reduction of losses. In this paper, the author discusses the applications of remote sensing and GIS in combating floods and conducting loss evaluation and presents the design principle of flood pre-warning monitoring and loss evaluating system. The system function modules were designed according to object-oriented theory, so as to realize the data managing, image processing, spatial analysis and output simulating function.
  • ARTICLES
    Development of Tourism Resources Evaluation System Based on GIS
    WANG Ying, WANG Zheng, LI Huaqun
    2004, 6(1): 62-66,80.
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    The main purpose of this paper is to study the protype system which is based on tourism resource classification system and GIS. Considering the scale of tourism resource area, we take the State level scenic spots as example and set up the classification and evaluation system of national tourism destination. In this paper, the construction of system framework and the realization of the system function were discussed in detail. Based on the classification systems of Guo & Wu et al. and Ying & Wei et al., we developed a new classification system based on GIS, at the same time we brought forward national characteristic resources and local characteristic resources. In designing the system, the data stream method, a valid analyzing method in programming was adopted. In addition, we beautified the interface of the system by using ActiveBar2.0 and ActiveSkin1.0. This system can be used to classify and evaluate the national tourism resource destination through the two classification systems, what's more, the evaluation of the quality of each tourism resource areas can also be done. Through comparing and analyzing the results, it is possible for us to draw some important conclusions which can support our decision.
  • ARTICLES
    An Evaluation of User Satisfaction at Tourism Website in Hebei Province
    LU Zi, GUO Laixi, BAI Cuiling
    2004, 6(1): 67-71.
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    The paper focuses on the impacts of IT in regional economic behavior, particularly explores the impacts of web technology, as a new type of IT, on tourism industry. The main contributions in tourism website development include: putting forward an evaluation system for tourism website, and according to the framework, Hebei province's tourism websites were evaluated from content setup, technology organization and service quality. At the same time, it established an online service functionality evolution framework and used the framework to orientate tourism website development in China, and identified current tourism website users and user satisfaction at online tourism service throughout the country. Academically, the study extends the research of communication geography.
  • ARTICLES
    Groundwater Inspecting System Based on Distributed Bus
    FU Min, HU Xiaohui
    2004, 6(1): 72-75.
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    Nowadays, the pollution of groundwater has become more and more serious. There are many pollution sources such as fuel, garbage, agriculture and industry related wastes. Because of lack of fresh water,groundwater has been over extracted. Therefore, changes of groundwater including quality, quantity, pH, temperature and water level should be monitored. To satisfy this need, we developed groundwater monitoring system based on distributed bus and sensor technology. This system can give us multi-parameter digital display and remote communication. We also used the HTG method in automatic measurement of groundwater quantity. Many other sensors have been used in detecting the other characters of groundwater. We designed a multi-access device to collect the signals from all kinds of sensors. After getting all the parameters, we transmitted these signals back to the computer by RS-485 distributed bus. The application software running on the computer uses the specific algorithm to process all the data, then changes of groundwater are displayed immediately. So the inspectors can know the situation and make corresponding decisions. The practical use shows that the system has satisfactory performance and good application result.
  • ARTICLES
    Design of Military Geographic Information System of Beijing Armed Police Based on Arcview
    TIAN Bo
    2004, 6(1): 76-80.
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    Beginning from the concept and development of Geographic Information System (GIS), this paper completely and systematically introduces the developing necessities, characters and key problems of military GIS. Due to very strong spatial analysis function of Geographic Information System and it′s broad application fields, GIS should be incorporated into military field to combine with patrol, antiterrorism, dealing with emergency accidents for armed police especially so that armed police can integrate, dynamically acquire and manage all kinds of informations about military and police themes. Concurrently, the enterprise-wide need to improve organizational effectiveness, efficiency, and services of Armed Police Force to protect national benefits and life safety. GIS may be used to analyze a lot of informations on regional environment to help resolving safety problems at best speed. Moreover, based on GIS, the military command automatic application system may support decision-making and bring into play its benefits adequately. Based on Arcview, we built a military GIS Demo version of Armed Police Force, which emphasies functions of network analysis, map plotting and 3D simulation. The demo system consists of six sub-function modules such as the best route design, mobile reinforcement, spatial analysis, drawing and plotting, 3D simulation and satellite image display. Hence, the demo system realized the best route design, nearest infrastructure selection, drawing and plotting of military map, 3D simulation and display of Tian′anmen Square within the second ring road in Beijing. Furthermore, the demo system can provide geographic information guarantee for the command automatic aid system on decision making and realize connection and sharing of military information. It can improve the efficiency and save human resources and materials.
  • ARTICLES
    Scenarios Analyses on the Spatio-temporal Patterns of Land Use Change--A Case Study in Taips County of Inner Mongolia
    DENG Xiangzheng, LIU Jiyuan, ZHAN Jinyan, ZHUANG Dafang, ZHAO Tao
    2004, 6(1): 81-88,1.
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    Scenarios analyses of regional land use change, influenced by various factors, have become the hot-spots of LUCC studies. Regarding system dynamics model and CLUE-S model as the modeling framework, this paper designed a Land-Use Change System Dynamics (LUCSD) model and realized the scenario analyses of baseline, ecologically-oriented and economically-oriented models in Taips County(2000～2020). The findings are concluded that land use change is a dynamic process driven by population growth, economic improvement and farming and pasturing development, and unused land in the northeastern and northwestern parts of Taips County will be the sensitive areas of land use change in the coming nearly 20 years. Based on different scenarios models, competition between land-use types led to diversity storylines in some areas. In this sense, some effective measures should be taken to hold back the irreversible but irrational conversions among land use categories to protect the eco-environment and go along with a sustainable development in Taips County.
  • ARTICLES
    Construction of Distributed Web-based Remote Sensing Model Library and Its Operational Mechanism
    TANG Shihao, SU Lihong, SHUAI Yanmin, WANG Zhuosen, LONG Kefeng
    2004, 6(1): 89-93,103.
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    Spectral characteristic is one of the basic characteristics of ground objects, and is the basis of qualitative and quantitative remote sensing. Although we've developed a lot of spectral databases during the past several years, some basic problems still existed in the remote sensing applications, such as the problems of same objects but with different spectra or the opposition, are still not solved completely, which have severely obstructed the development of remote sensing application and industrialization. The main reason lies in that we haven't paid enough attention to the structure, material, and aspection of the measured objects before, and the constructed databases are short of supports of remote sensing models, so the measured data in the databases can't be extended to other cases. The new generation spectral database will be featured by the matching of ground objects' structure, spectra, knowledge library, and model library. Its aim is to solve problems confronted in the previous spectral databases. In this paper, we state the status and function of remote sensing model library in spectral knowledge library, and discuss its structure, system architecture and development technique under network environment. Its operational mechanism under the support of spectral knowledge library and metadata is also discussed. We put forward the web-based three-tiered distributed system architecture and component-based construction method of remote sensing model library. Meanwhile, we also discuss the definition of model metadata from the point of view of remote sensing model library,and put forward metadata-based management and operational mechanism of remote sensing model library. Finally, an application instance and some key codes are presented in the paper.The construction of distributed Web-based remote sensing libraries will greatly enhance the functions of spectral databases, and expand their usable ranges. The component-based design philosophy and metadata-based application and management method ensure that the model library can be updated and modified dynamically to keep its progress and practicability and enhance the reusability of codes.
  • ARTICLES
    Dynamic Monitoring of Coastline in the Yellow River Delta by Remote Sensing
    CHANG Jun, LIU Gaohuan, LIU Qingsheng
    2004, 6(1): 94-98.
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    The Yellow River is well-known for its highest sediment contents of all rivers in the world. Due to the huge sediment to the coast, the Yellow River Delta is in a state of continuous dynamic change. The most recent shift occurred in 1976, and a new sub-delta is being created since then. This paper describes the method and technology for monitoring the coastline change of the Yellow River Delta using remote sensing. The multi-temporal Landsat and other satellite images were used as the monitoring data source. The images were registered to the high precision GIS database, and they were matched each other and matched with the database. All the images have the same coordinate system. A mean high water (MHW) model was developed for extracting coastlines from remote sensing images. 20 coastlines were extracted from different years. The result shows that a new territory of 330km2 was formed in the present estuary area from 1976 to 2000. At the same time, a territory of 137km2 was eroded in the Diaokou estuary area to the north of the Yellow River Delta. In conclusion, it is the substantial foundation for the water and sedimentation of the Yellow River to shape the delta. That is, it is the essential factor leading to coastline evolution.
  • ARTICLES
    Evaluation on Image Fusion Algorithms of Landsat-7 ETM+ PAN Band and Multispectral Bands
    XU Rongfeng, XU Hanqiu
    2004, 6(1): 99-103,119.
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    The Landsat-7 ETM+ Panchromatic band is taken simultaneously with multispectral bands using the same sensor system. The solar illumination and other environmental conditions are identical. They are received at the same time. The two data sets, therefore, can achieve the best fusion result without coregistration. Now there are many image fusion algorithms. Four fusion algorithms are applied to the data fusion between Landsat-7 ETM+ PAN band and multispectral bands respectively to determine which one is the best suitable methods for ETM+ image. The four fusion algorithms include HIS transformation, Brovey transformation, SFIM transformation and Weighting fusion. The result of different merging methods are evaluated qualitatively and quantitatively by comparison with the spectral fidelity and the spatial texture information. The study indicates that Smoothing Filter-Based Intensity Modulation (SFIM) is very fit for fusion with ETM+ images on the whole. SFIM technique distorts the spectral quality slightly, and at the same time improves the spatial resolution apparently.
  • ARTICLES
    The Creation of Chart Database Based on the IHO S-57 Transfer Standard
    LI Hongli, LI Hanrong, ZHU Jianliang, WANG Hai
    2004, 6(1): 104-108.
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    The IHO S-57 standard is an international digital data transfer or exchange standard for hydrographic information. In this paper, all the aspects of the S-57 standard are analyzed in detail through discussing on the standard′s origin, status, development and key points. In the following, according to S-57 standard it has given out the theoretical model, data model, implementation method and the instances of database structure for creation of chart database. It is designed through analyzing the difference between the S-57 standard and existing national chart database. Finally, it points out that the implementation of the S-57 standard is the necessity for the development of the information society and it is also the necessity for the transition from the Charting-Oriented database to the Geographic-Reality-Oriented database.
  • ARTICLES
    The Compilation and Production of "The Geographic Map of the People's Republic of China
    LIU Xiaojing, WANG Guangxia, ZHANG Xinhui, LI Shaomei
    2004, 6(1): 109-112.
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    Comparing with traditional handcraft of mapping, to produce maps using computer can advance the work efficiency consumedly, relieve map-fabricants' labor intensity, make map digital and provide much more information. So,we say, great changes have taken place in mapping since the introduction of computeraided cartography. However, there are many differences in technological flows of mapping between computer mapping and artificial mapping, and some key technologies of computer graphics and images processing are also involved.Based on compilation and production of "The Geographic Map of the People's Republic of China", this paper introduced the main idea and the main content and the way of selecting and dealing with elements,and discussed the process of compiling and the experience of producing wall map, especially, the geomorphologic representation method for 1︰3 000 000 scale "The Geographic Map of the People's Republic of China". The selection of the relief method and the production process aided by computer.
  • ARTICLES
    Railway Land Registration and Mapping with the Support of GIS--Taking Jinhua-Wenzhou Line as an Example
    ZHANG Xia
    2004, 6(1): 113-113.
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    With the construction and constant consummation of land property right in China, land registration of railway and highway are becoming more and more frequent,but such a kind of land registration differs from general land registration, hence it is of practical significance to probing into railway land registration. Taking Jinhua-Wenzhou line as a case, this paper analyses the characteristics of the continuity, integrity and multi-plicity of the boundary point data of cadastral survey of the railway land. Based upon which, this study managed to realize boundary point data accuracy mapping and establish the land registration graphic database with the support of GIS as well as to present a technical flow chart of railway land map compilation and complete land registration cartography by applying powerful cartographic function and abundant spatial analytic and statistic analytic functions.