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Visualization of geologic geospatial datasets through X3D in the frame of webgis

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International Journal of Digital Earth 2013年第5期6卷 483-503页

作者： Frederik von Reumont Jamal Jokar Arsanjani Andreas Riedl Department of Geography and Regional Research Cartography and GeoinformationUniversity of ViennaViennaAustria Geography and its Didactics University of Cologne50931CologneGermany

3D geo spatial data have become the ***,to view the data,usually expert software is required,which have up to now hindered the wide spread use of 3D scenes for the display of geological *** internet real time 3D rendering framework X3D is assessed regarding its suitability for building a geological GIS on the *** important for geological data,3D rendering enhances the intuitive grasp of the data and enables the user to interactively explore *** is often necessary to find a solution to distribute this data to a wide range of interested parties,experts and non-experts *** to the nature of 3D data,the best technique to display geo-data,the modeling of objects and unresolved issues have to be taken into *** internet is the apparent tool for the public distribution and visualization of 3D data and it was found that through the open ISO-standardized format X3D it offers a multitude of possibilities.A 3D geological interactive map was created with these prerequisites to identify challenges and possibilities through this *** was found that the use of lead to satisfactory results,that could probably not have been achieved with another technology.

关键词： webgis geology X3D interactive map 3D visualization internet x3dom virtual reality

Design and Implementation of webgis Based on SOAP

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Wuhan University Journal of Natural Sciences 2003年第04A期8卷 1085-1089页

作者： Feng Yu-cai, Yi Bao-lin, Tan Zhi-peng College of Computer Science and Technology, Huazhong University of Science and Technology, Wuhan 430074, Hubei, China Huazhong University of Science and Technology

Most popular applications currently running on the Internet, the World Wide Web is of an exponential growth in size, which results in network congestion and server overloading. In this paper, we analyze the characteristics of SOAP (Simple Object Access Protocol) and the state-of-art techniques, which have been used in webgis. Then, the basic characteristics of DM3 database system were introduced; Furthermore, a novel N-tier webgis architecture based on SOAP and the framework supported both server-based and client\|based solutions are proposed. Finally, some experiments and implementations are shown.

关键词： SOAP webgis spatial databases

STUDY OF SETTING UP THE FOREST RESOURCES MANAGEMENT INFORMATION SYSTEM BASED ON webgis

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Chinese Geographical Science 2003年第1期13卷 56-61页

作者： WU Su-li, LOU Quan-sheng, QUAN Zhi-jie, LI Xiao-jun (Northwest Sci-tech University of Agriculture and Forestry, Xi’an 712100, P. R. China) Northwest Sci-tech University of Agriculture and Forestry Xi’an P. R. China

Based on an analysis of the characteristics of the Forest Resources Management Information System of each development phase, and consideration of the technical trend in Geographic Information System (GIS) in the Internet Age, this paper explores the importance and the feasibility of setting up Forest Resources Management Information System based on the webgis. At the same time, based on the experience of our study, the paper explores the function, structure and method of developing the Forest Resources Management Information System based on webgis. With the technology of webgis, the Forest Resources Management Information System with data from Huoditang Farm was set up, which makes a great impact on forest resources management. So setting up the Forest Resources Management Information System based on webgis is a trend of forest resources management. In the course of setting up this system, we must pay attention to following questions: 1) unify data standard and information encoding; 2) change mind.

关键词： webgis forest resources management information system

Design and Construction of System for Marine Geophysics Data Sharing Based on webgis

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Journal of Earth Science 2012年第6期23卷 914-918页

作者：王建村苏天赟李新仲李家钢李清平雷方辉李忠涛 The First Institute of Oceanography SOA Research Center of China National Offshore Oil Corporation

A browser/server system has been developed for the purpose of marine geophysical data sharing based on webgis technology, which uses MapServer open source system and ORACLE Data- base Management System. The main steps during development, including system design and imple- mentation, are discussed in this article. The system can provide convenient, efficient, and interactive marine geophysical information sharing and visualization services through Internet or Intranet to im- prove data exchange and utilization.

关键词： webgis marine geophysics MapServer information sharing system.

Development and Application of webgis Middleware in Oil Production Engineering

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Wuhan University Journal of Natural Sciences 2004年第5期9卷 711-716页

作者： LiUQuan SUNJi-gui LlUJing CollegeofComputer.ScienceandTechnology.JilinUniversity Changehun130012Jilin.China DaqingOil-FieldOilProductionEngineerInstitute.Daqing163453 HeilongjiangChina

webgis is the result of combining the technology of Internet with that of Geographic Information Systems (GIS). This paper aims at some problems in the development of GIS, such as the system of development is instable, and presents the method of adopting component technology to accomplish webgis middleware which has been successfully applied to the Oil Production Engineering information visible system. It showed in practice that the webgis middleware can be casily embedded in the web pages to accomplish GIS application system in a network environment. On the one hand, its application can reduce complexity of system and speed up the pace of development. On the other hand, it is certain to reduce the development costs and improve the maintainability. Key words webgis - middleware - oil production engineering CLC number TP 31 Biography: LIU Quan (1969-), male, Ph. D. candidate, research direction: include automated resoning, webgis.

关键词： webgis middleware oil production engineering

Comprehensive Risk Analysis of Storm Surge Flood Based on webgis

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Transactions of Tianjin University 2012年第3期18卷 194-200页

作者：佟大威孙宜超孙蕊蕊王晓玲周正印 State Key Laboratory of Hydraulic Engineering Simulation and Safety Tianjin University School of Environmental Science and Engineering Tianjin University

The comprehensive risk analysis of storm surge flood is vital to the safety management of sea embank- ment, the scientific assessment of storm surge disaster and the improvement of emergent treatment in storm surge haz- ard. Based on the research of disaster-causing, disaster-pregnant and disaster-bearing factors, the influencing factors of storm surge risk are concluded to be flood natural risk, embankment position, embankment width and height. The membership degree of the factors of stoma surge risk is firstly determined by storm surge flood evolution based on webgis, and the comprehensive risk membership and risk grade of each influencing factor are obtained. Then the effects of a single factor on comprehensive risk and sensitivity analysis are discussed, and the storm surge flood risk map is obtained. Finally, the storm surge of Tianjin Binhai New Area is taken as a case. The results show that the in- fluencing degree of the factors on the comprehensive risk membership is in decreasing order of flood natural risk, em- bankment position, embankment width and height. The flood risk map of the case is drawn, which is useful to decrease losses caused by storm surge disaster.

关键词： storm surge comprehensive risk webgis sensitivity analysis risk map

A New Vector Data Compression Approach for webgis

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Geo-Spatial Information Science 2011年第1期14卷 48-53页

作者： LIYunjin ZHONG Ershun Institute of Geographic Sciences and Natural Resources Research. Chinese Academy of Sciences llA Datun Road Chaoyang District Beijing 100101 China

High compression ratio,high decoding performance,and progressive data transmission are the most important require-ments of vector data compression algorithms for *** meet these requirements,we present a new compression *** paper begins with the generation of multiscale data by converting float coordinates to integer *** is proved that the distance between the converted point and the original point on screen is within 2 pixels,and therefore,our approach is suitable for the visualization of vector data on the client *** coordinates are passed to an Integer Wavelet Transformer,and the high-frequency coefficients produced by the transformer are encoded by Canonical Huffman *** experimental results on river data and road data demonstrate the effectiveness of the proposed approach:compression ratio can reach 10% for river data and 20% for road data,*** conclude that more attention needs be paid to correlation between curves that contain a few points.

关键词： vector data compression webgis progressive data transmission

Application of GML and SVG in the development of webgis

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Journal of China University of Mining and Technology 2008年第1期18卷 140-143页

作者： XI Yan-tao WU Jiang-guo School of Resources and Earth Science China University of Mining ＆ Technology Xuzhou Jiangsu 221116 China

Our study deals with two major issues impacting current webgis development： interoperability of heterogeneous data and visualization of vector data on the Web. By using the combination of Geography Markup Language （GML）, Scalable Vector Graphics （SVG） and Web Feature Service （WFS） Implementation Specifications developed by the OpenGIS Consortium （OGC）, a strategy of webgis is proposed. The GML is used as a coding and data transportation mechanism to realize interoperability, the SVG to display GML data on the Web and the WFS as a data query mechanism to access and retrieve data at the feature level in real time on the Web. A case study shows that the combination mentioned above has enormous potential to achieve interoperability while not requiring considerable changes to existing legacy data. Original data formats need not be changed and could still be retrieved using WFS and transformed into GML in real time. SVG can oroduce suoerior ouality vector maps on a Web browser.

关键词： GML SVG WFS interoperability webgis

A General Standard of webgis Integration

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Wuhan University Journal of Natural Sciences 2009年第2期14卷 125-128页

作者： LI Shijun HONG Hui LIU Pei YU Wei ZHANG Zhuo School of Computer Wuhan University Wuhan 430072Hubei China State Key Laboratory of Software Engineering Wuhan University Wuhan 430072 Hubei China

Nowadays, existing webgis applications are isolated from each other. It is meaningful and challenging to integrate these existing applications to reduce resource loss. In this paper, the concept of webgis integration service is presented and its classification including width integration and depth integration is brought out. According to width integration and depth integration, a general standard of webgis integration is proposed. The merits of webgis integration service are analyzed with the representative examples from both of the two classes mentioned above.

关键词： webgis integration service data integration