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An efficient rendering method for large vector data on large terrain models

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Science china(information Sciences) 2010年第6期53卷 1122-1129页

作者： YANG Ling1,ZHANG LiQiang1,KANG ZhiZhong2,XIAO ZhiQiang1,PENG JunHuan2,ZHANG XingMing1 & LIU Liu11state key laboratory of {3. sensing Science,Jointly Sponsored by Beijing Normal university and the Institute of {3. sensing Applications of Chinese Academy of Sciences,Beijing 100875,china 2Department of Geodesy and Geomatics,School of Land Science and Technology,china university of Geosciences,Beijing 100083.china 1. state key laboratory of {3. sensing Science Jointly Sponsored by Beijing Normal University and the Institute of Remote Sensing Applications of Chinese Academy of Sciences Beijing 100875 China2. Department of Geodesy and Geomatics School of Land Science and Technology China University of Geosciences Beijing 100083 China

This paper presents an efficient way to render large-scale vector maps on level-of-detail(LOD) digital elevation models(DEMs).By using the frame buffer and Voronoi diagram,we achieve a rapid simplification of large-scale vector maps while keeping their original topological *** the simplified maps,we establish level-of-detail vector map *** the detailed level,we use the stencil shadow volume approach to render the map accurately,and in the coarse level we use substitute techniques to render the map approximately yet more *** method proposed in this paper is universally applicable to rendering vector maps on various LOD terrain models,and the overlaying performance is independent of the complexity of underlying terrain *** use of the view frustum culling and sub-region index techniques,the impact of complexity of vector maps is reduced,and the rendering time is restricted to a certain ***,we can achieve seamless and rapid rendering of large-scale vector maps on LOD terrain surfaces.

关键词： large-scale vector maps LODs view-dependent visualization

Evaluation of Fragility of the Economic System in Poyang Lake Ecological Economic Zone

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Asian Agricultural Research 2012年第8期4卷 72-76页

作者： CHENG Qiao-zhen 1 ,CHEN Xiao-ling 1. 2 ,ZHU Feng-feng 1 ,ZHU Jing 1 1. School of Geography and Environment,Jiangxi Normal university,Nanchang 3.0022,china 2. state {3. laboratory of information engineering in surveying,mapping and remote sensing,Wuhan 43.022,china

From two aspects,namely the sensitivity of regional economic system to internal and external interference,and its resilience,we establish the evaluation indicator system of fragility of the economic system in Poyang Lake Ecological Economic Zone,and evaluate the internal differences in fragility of the regional economic system,using set pair analysis method. The results show that there is a great difference in fragility of the economic system between different administrative units; the difference in resilience is the major factor responsible for difference in fragility of the economic system in various cities and counties within the region; according to the difference in fragility characteristics,we conduct classification as follows: Nanchang City is a low-sensitivity and high-resilience type; Jiujiang City is a high-sensitivity and high-resilience type; Jiujiang County,Xingzi County,Yongxiu County,Hukou County,Duchang County,Ruichang County,De'an Xian,Wuning County,Pengze County,Leping City, Dongxiang County,Fengcheng City and Gao'an City are a high-sensitivity and low-resilience type; other cities and counties are a low-sensitivity and low-resilience type.

关键词： Fragility evaluation The economic system Poyang La

Characteristics of landscape information Tupu of the Yellow River swings and its subdeltas during 1855―2000

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Science china Earth Sciences 2007年第10期50卷 1566-1577页

作者： YE QingHua1,3., CHEN ShenLiang2, HUANG Chong4, XUE YunChuan5, TIAN GuoLiang3. CHEN ShuPeng3.4, SHI YaNan4, LIU QingSheng4 & LIU GaoHuan4 1 Institute of Tibetan Plateau Research (ITPR), Chinese Academy of Sciences (CAS), Beijing 100085, china 2 state key {3. of Estuarine and Coastal Research, East china Normal university, Shanghai 200062, china 3.state key {3. of remote sensing Science, Institute of remote sensing Applications (IRSA), CAS, Beijing 100101, china 4 Institute of Geographic Sciences and Natural Resources Research, CAS, Beijing 100101, china 5 Qingdao Meteorological Bureau, Qingdao 266003. china 1. Institute of Tibetan Plateau Research (ITPR) Chinese Academy of Sciences (CAS) Beijing 100085 China 3. state key laboratory of {3. sensing Science Institute of Remote Sensing Applications (IRSA) CAS Beijing 100101 China 2. state key laboratory of Estuarine and Coastal Research East China Normal University Shanghai 200062 China 4. Institute of Geographic Sciences and Natural Resources Research CAS Beijing 100101 China 5. Qingdao Meteorological Bureau Qingdao 266003 China

Based on the theories and methods of cartography on spatial pattern and temporal evolution in Geo-information Tupu (Carto-methodology in Geo-information, CMGI) and the quantitative measurements of pattern and process in landscape ecology, the methodology of landscape information Tupu in studying the swing process of the Yellow River (YR) over the Yellow River Delta (YRD) during 1855― 2000 has been demonstrated. The main content includes: (1) methodology of landscape information Tupu; (2) evolution process Tupu of YR rump channels; (3. evolution process Tupu of the 7 pieces of subdeltas in YRD during 1855―2000; (4) landscape information Tupu of the modern YRD and the current YRD; (5) landscape information Tupu of YR rump channels on the 7 pieces of subdeltas during 1855―2000; and (6) corridor-matrix landscape information Tupu by YR swings. The methodology of landscape information Tupu here is still primary but we hope that it could provide a new tool for exploring an integrated research on spatiotemporal approaches for landscape "pattern and process".

关键词： Geo-information Tupu, landscape information Tupu, spatiotemporal analysis, the Yellow River (YR), the Yellow River Delta (YRD), corridor-matrix landscape

High geo-stress distribution and high geo-stress concentration area models for eastern margin of Qinghai-Tibet plateau

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Science china(Technological Sciences) 2011年第S1期54卷 154-166页

作者： HUANG RunQiu,WANG YunSheng,WANG ShiTian & LI YuSheng state key laboratory of Geo-hazard Prevention and Geo-environment Protection,Chengdu {3. of Technology,Chengdu 610059,china 1. state key laboratory of Geo-hazard Prevention and Geo-environment Protection Chengdu University of Technology Chengdu 610059 China

High geo-stress and its engineering problems have severely affected the development of civil infrastructures in western china. The problems include high rock slope instabilities,rock burst,gas explosion and large-scale soft rock deformation in deep *** paper investigates the distribution of the high geo-stresses and the models of the stress concentration areas in the eastern margin of Qinghai-Tibet plateau so that a solid foundation can be formed to address the *** investigation is based on a comprehensive analysis of the previous research data of the eastern margin and uses remote {3. techniques,geophysics,geochemistry,and large scale geological surveying *** investigation has found that some special tectonic zones have high *** high geo-stresses are located at(1) the convergent boundary areas between two fault blocks with large strength differences,(2) the tectonic necks in front of active fault blocks,and(3. the intersection and/or termination areas of faults within the fault *** example for(1) is the north Qilian high geo-stress *** example for(2) is the Minshan high geo-stress area in the northwest ***,the investigation has summarized six basic models to characterize the high geo-stress concentration *** first one is the convergent stress concentration model at the boundary of two fault *** other five stress concentration modes are oblique fissures or intersecting areas,areas without lower velocity layer in the crust,areas of compression induced tensile cracking,tectonic wedge areas,and tectonic neck areas,respectively.

关键词： high geo-stress geo-stress concentration model regional geo-stress distribution Qinghai-Tibet plateau

Ceometric calibration of high-resolution remote sensing sensors

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Ceometric calibration of high-resolution remote sensing sens...

5th Asian Symposium on Geographic information System from Computer Science & engineering View

作者： LIANG Hong-you~(1,2,3. GU Xing-fa~1 TAO Yu~1 QIAO Chao-fei~4 (1.Graduate university of Chinese Academy of Sciences,Beijing 10003.,P.R.china 2.state {3. laboratory of remote sensing Science,Institute of remote sensing Applications,CAS,Beijing 100101,P.R.china 3.Henan Polytechnic university,Jiaozuo 454003.P.R.china 4.Development and Research Center for surveying and {13. state Bureau of surveying and {13.,Beijing 100044,P.R.china)

＜正＞This paper introduces the applications of high-resolution remote sensing imagery and the necessity of geometric calibration for remote sensing sensors considering assurance of the geometric accuracy of remote sensing *** the paper analyzes the general methodology of geometric *** the DMC sensor geometric calibration as an exam- ple,the paper discusses the whole calibration ***,it gave some concluding remarks on geometric calibration of high-resolution remote sensing sensors.

关键词： digital camera geometric calibration geometric correction remote sensing

Ecological Instream Flow Requirements Calculation of Pihe River by Montana Methodology in Sichuan Basin,china

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Ecological Instream Flow Requirements Calculation of Pihe Ri...

2007中国科协年会

作者： W.Ouyang~(1,2) F.H.Hao~1 H.Chen~1 X.Wang~1 S.T.Yang~3.1.School of Environment,state key laboratory of Water Environment Simulation,2.Beijing Normal {3. 2.International Institute for Geo-information Science and Earth Observation(ITC),Netherlands 3.state key laboratory of remote sensing Science,Beijing key laboratory for remote sensing of Environment and Digital Cities,School of Geography,Beijing Normal {3.

With the rapid economic developments in china,the future water resource developments should be sustainable and that a component of the natural flow of rivers should be reserved to ensure diverse ecological *** last 15 years,ecological instream flow requirements(EIFR)research of river was one of the main and hot fields for eco-hydrology *** this paper,we summarized the research advance of eco-hydrology and also,the conception of the EIFR was also followed and *** ecological instream flow has three main functions:maintain the water ecological environments,dilute pollutants and *** coordinate with the water resource allocation,we evaluated EIFR of Pihe River section in every 12 month of three typical years (1968,1986 and 1987).Pihe River is one of the main waterr sources for the cities in Sichuan Basin and locates in the lower beach of famous Doujiang *** Montana methodology was widely applied in water requirements estimate and proved *** on natural characters of Pihe River,minimum and optimum water requirement of aquatic habitat for the river maintenance were *** water requirement of Pihe River was computed too,which is related with the width of water surface,the river length and evaporation depth. Considering the water quality goal,diluting pollutant water requirement was taken into *** the EIFR of the river of 12 month were ultimateS,*** them,that was 20.64m/s and the minimum eco-environmental water requirement of the river was 25.84m/s.

关键词： Eco-environmental water requirements Water resource allocation Water quality goal Pollutant dilute water requirement

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基于正射影像与高程模型匹配的地表更新方法

系统仿真学报 2008年第S1期20卷 298-300页

作者：简灿良叶荣青福建省基础地理信息中心福州350003 武汉大学测绘遥感信息工程国家重点实验室武汉430079

如何实时、高精度地获取地表更新方法是目前3.(GIS,GPS,RS)技术应用需重点解决的关键问题。本文通过将正射影像与数字高程模型匹配,基于目前主流的RS、GIS软件支持下,提出一种能够实时、快速、高精度地获取地表更新信息的技术方法,并以... 详细信息

如何实时、高精度地获取地表更新方法是目前3.(GIS,GPS,RS)技术应用需重点解决的关键问题。本文通过将正射影像与数字高程模型匹配,基于目前主流的RS、GIS软件支持下,提出一种能够实时、快速、高精度地获取地表更新信息的技术方法,并以地形中的重要地物——道路的实时更新为例,对这种技术方法进行了应用示范,实践证明了该方法具有较大的应用和推广价值。

关键词：正射影像高程模型匹配地形更新

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基于形态插值的图像重建方法

计算机工程与应用 2004年第18期40卷 26-28页

作者：段汕秦前清武汉大学测绘遥感信息工程国家重点实验室中南民族大学计算机科学学院武汉430074 中南民族大学计算机科学学院

该文提出了一种基于数学形态学的形态插值方法,该方法适用于对于二值图像、灰值图像以及多光谱图像的插值重构,通过形态插值技术将输入图像变换成保持某种特征的插值图像。所提出的方法是对基于测地距离函数和形态中值方法的扩展,以提... 详细信息

该文提出了一种基于数学形态学的形态插值方法,该方法适用于对于二值图像、灰值图像以及多光谱图像的插值重构,通过形态插值技术将输入图像变换成保持某种特征的插值图像。所提出的方法是对基于测地距离函数和形态中值方法的扩展,以提高插值方法的有效性为目的。该文还从应用的角度对于分割序列图像的插值重建算法进行了研究,所获得的新算法能较好地应用于各种类型图像的插值与形变。

关键词：形态插值形态算子数学形态学

Intensive radiosonde observations of gravity waves in the lower atmosphere over Yichang （111°18′E,3.°42′N）,china

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Intensive radiosonde observations of gravity waves in the lo...

第十二届全国日地空间物理学术讨论会

作者： Shao Dong ZHANG~(1,2,3. Fan YI~(1,2,3. Chun Ming HUANG~(1,2,3. 1 School of Electronic information,Wuban university,Wuhan,Hubei,People''s Republic of china 2 {3. laboratory of Geospace Environment and Geodesy,Ministry of Education,Wuhan,Hubei,People''s Republic of china 3.state Observatory for Atmospheric remote sensing.Wuhan,People''s Republic of china

＜正＞The characteristics of dynamical and thermal structures and inertial gravity waves （GWs） in the troposphere and lower stratosphere （TLS） over Yichang （111°18′E,3.°42′N） were statistically studied by us...

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