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Gradient analysis of landscape spatial and temporal pattern changes in beijing metropolitan area

Science china(Technological Sciences) 2010年第S1期53卷 91-98页

作者： YANG YeTao1,ZHOU QiMing2,GONG JianYa3.& WANG YingYing4 1 Institute of Geophysics and Geomatics,china University of Geosciences,Wuhan 43.074,china 2 Department of Geography,Hong Kong Baptist University,Hong Kong 3.State Key Laboratory of Information Engineering in surveying,{3. and Remote Sensing,Wuhan University,Wuhan 43.074,china 4 Hubei Provincial Bureau of Meteorology,Wuhan 43.074,china Institute of Geophysics and Geomatics China University of Geosciences Wuhan China Department of Geography Hong Kong Baptist University Hong Kong China State Key Laboratory of Information Engineering in surveying Mapping and Remote Sensing Wuhan University Wuhan China Hubei Provincial Bureau of Meteorology Wuhan China

The gradient based landscape metrics analysis is now widely used to study the landscape pattern changes in respond to the *** order to discover the trend of spatio-temporal changes in beijing metropolitan area during the past 15 years,several landscape metrics are computed using a moving window along a 96 km long transect across beijing metropolitan area from west to ***,the spatial extent of sub-landscape,which is determined by the moving window’s size,is profoundly *** results show that the metrics varies smoothly and regularly along the selected transect when the window size is greater than 6 km×6 km,and irregularly fluctuated for the smaller window size,that the spatial and temporal landscape characteristics of beijing city match the hypothetical framework of spatio-temporal urban sprawl in the form of alternating processes of diffusion and coalescence well,and that some new trends of the urban sprawl style in beijing metropolitan area,such as leap-frog manner,are also detected by the gradient landscape analysis.

关键词： gradient analysis landscape metrics spatio-temporal urban expansion multi-extent

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Synthetically adaptive robust filtering for satellite orbit determination

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Science china Earth Sciences 2004年第7期47卷 585-592页

作者： YANG Yuanxi1 & WEN Yuanlan2 1. Xi’an Research Institute of surveying and mapping, Xi抋’an 710054, china 2. College of Aerospace and Material Engineering, National University of Defense Technology, Changsha 410073. china Xi’an Research Institute of surveying and mapping Xi’an China College of Aerospace and Material Engineering National University of Defense Technology Changsha China

The quality of the satellite orbit determination is rested on the knowledge of per-turbing forces acting on the satellite and stochastic properties of the observations, and the ability of controlling various kinds of errors. After a brief discussion on the dynamic and geometric orbit determinations, Sage adaptive filtering and robust filtering are reviewed. A new synthetically adaptive robust filtering based on a combination of robust filtering and Sage filtering is *** is shown, by derivations and calculations, that the synthetically adaptive robust filtering for orbit determination is not only robust but also simple in calculation. It controls the effects of the outliers of tracking observations and the satellite dynamical disturbance on the parameter esti-mates of the satellite orbit.

关键词： satellite orbit, Sage filtering, adaptive orbit determination, robust estimation.

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Fuzzy entropy image segmentation based on particle swarm optimization

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Progress in Natural Science:Materials International 2008年第9期18卷 1167-1171页

作者： Linyi Li a, Deren Li b, a School of Remote Sensing and Information Engineering, Wuhan University, Wuhan 43.079, china b State Key Laboratory of Information Engineering in surveying, mapping and Remote Sensing, Wuhan University, Wuhan 43.079, china School of Remote Sensing and Information Engineering Wuhan University Wuhan 430079 China State Key Laboratory of Information Engineering in surveying Mapping and Remote Sensing Wuhan University Wuhan 430079 China

Particle swarm optimization is a stochastic global optimization algorithm that is based on swarm *** of its excellent performance, particle swarm optimization is introduced into fuzzy entropy image segmentation to select the optimal fuzzy parameter combination and fuzzy threshold *** this study, the particles in the swarm are constructed and the swarm search strategy is proposed to meet the needs of the segmentation *** fuzzy entropy image segmentation based on particle swarm opti-mization is implemented and the proposed method obtains satisfactory results in the segmentation *** with the exhaustive search method, particle swarm optimization can give the same optimal fuzzy parameter combination and fuzzy threshold while needing less search time in the segmentation experiments and also has good search stability in the repeated ***, fuzzy entropy image segmentation based on particle swarm optimization is an eficient and promising segmentation method.

关键词： Image segmentation Fuzzy entropy Particle swarm optimization Fuzzy parameter combinations Fuzzy threshold

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TWO-DIMENSION PERIODIC CARDINALINTERPOLATORY WAVELETS

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Analysis in Theory and Applications 1999年第1期15卷 64-74页

作者： Zhu Changqing(Zhengzhou Institute of surveying and mapping, china)(Zhejiang University, china)

In this paper, we construct two-dimension periodic interpolatory scaling function and wavelets from a periodic function g(x1, x2), whose Fourier coefficients are positive, and obtain some properties of scaling functio... 详细信息

关键词： oscillatory integral operator multiplier singularity

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A hybrid matching method for geospatial services in a composition-oriented environment

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Science china(Technological Sciences) 2010年第S1期53卷 213-220页

作者： LUO An 1,2,WANG YanDong 1,2 & CHEN ShengHua 2 1 State Key Laboratory of Software Engineering,Wuhan University,Wuhan 43.072,china 2 State Key Laboratory of Information Engineering in surveying,mapping and Remote Sensing,Wuhan University,Wuhan 43.079,china State Key Laboratory of Software Engineering Wuhan University Wuhan China State Key Laboratory of Information Engineering in surveying Mapping and Remote Sensing Wuhan University Wuhan China

With the development of Internet and GIS,large volumes of spatial data,powerful computing resources and many spatial data processing functions are published in the form of Web *** suitable geospatial services in the composition-oriented environment is a crucial *** semantic Web provides a kind of technology to find and compose various service resources automatically through the *** paper proposes a hybrid method for the semantic matching of geospatial *** method includes two *** 1 puts forward a multi-level semantic matching approach,which matches single geospatial service at four levels:classification,input/output,precondition/effect and the quality of service(QoS).This multi-level matching approach makes single service matching quicker and more *** 2 puts forward a matching algorithm for a geospatial service chain based on the *** algorithm adopts a trace algorithm,taking account of the effect of the *** restricts the input/output parameters of the current service by the input/output parameters of service chain,pre-service and *** matches the atomic service dynamically in a composition-oriented environment,and accurately converts the abstract model of geospatial services into an executable geospatial service chain.A case study of the flood analysis for the Poyang Lake illustrates the effectiveness of our context-based matching method for geospatial services.

关键词： geospatial services semantic context composition service match

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china: MAIN GEODETIC ACTIONS 1996-2000

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Bulletin of the Chinese Academy of Sciences 1996年第4期10卷 286-290页

作者： Chen Junyong(National Bureau of surveying and mapping, beijing) CAS Member

This article reviews the progress made in geodetic work in china since the *** order to meet the needs of china’s economic and defense construction,and scientific and social development in the early 21th century,some main geodetic actions which should be completed before 2000 are proposed as follows.(1) Monitoring vertical crustal movements and conducting studies on its *** of the second phase of the national first order leveling *** of the vertical crustal movement.(2) Improvement of national space geodetic *** main task is to lay down a national B-order GPS network and complete its data processing.(3. Refining of Chinese local gravity field on land and *** determination of Chinese local quasi geoid with higher than one meter *** of

关键词： GPS data VLBI MAIN GEODETIC ACTIONS 1996-2000 china

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The Mathematic Models of the Kalman Filtering for Across-Fault Measurement

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Earthquake Research in china 1994年第3期8卷 92-103页

作者： You Lilan,Liu Dajie,Huang Jia’na,Liu Xue and Zhou KechangInstitute of Crustat Dynamics,SSB,beijing 100085,china Wuhan Technical University of surveying and {3.,Wuhan 43.070,china National Center for Seismic Data and Inforraanon,SSB,beijing 100045,china

This paper makes a probe into the application of the Kalman filtering method to the data processing of across-fault *** the basis of statistical regression,the mathematic and stochastic models of filtration are established by combining the regression method with Kalman *** the filtering computation,not only the randomness of fault movements but also the time-dependent variation of environmental effects have been taken into *** use of the adaptive filtering method,an estimation of the dynamic noise variance matrix is obtained through *** for one measuring line(leveling line or baseline),two measuring lines(both leveling lines or both baselines)and four measuring lines(two leveling lines and two baselines)are derived and established *** means of these models,the data of across-fault measurements can be processed dynamically in real-time to provide the filtered values of height difference between benchmarks or baseline length at different time

关键词： Across-fault measurement Kalman filtration State equation Observational equation Initial state Dynamic noise

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Photo geologic logging methods

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中国有色金属学会会刊：英文版 2005年第S1期15卷 250-253页

作者： ZHANG You-jing, LI Hao, GAO Yun-xiao (Department of surveying and mapping, Hohai University, Nanjing 210098, china)

Aiming at the shortage of hydroelectric engineering geological logging methods on high side slope and big gallery, the photographic methods based on digital camera were studied. By integrating the application of technology of close range photogrammetry, digital image processing and GIS, the photographic geological logging information system was developed. The system has the functions of digital photography, orthophotoquad making, image mosaicking, logging factors extracting and measuring, CAD mapping, etc. The methods achieve more efficient and higher precision than the regular, and it provides a new way for the hydroelectric engineering geologic logging.

关键词： photo geologic logging digital camera close-range photogrammetry GIS

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Effects of the MW 9.0 Tohoku Earthquake on GPS Position Time Series in china

Effects of the MW 9.0 Tohoku Earthquake on GPS Position Time...

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第三届中国卫星导航学术年会

作者： Wang xiaoming 1,Cheng yingyan 1,Jiang zhihao 2,Liu li 3.1 Chinese Academy of surveying and mapping,beijing 10083.,{3.) (2 National Geomantics Center of china,beijing,100048,{3.) (3.the First surveying and mapping Institute of Zhejiang Province,Zhejiang,3.0012,{3.)

By processing the data of IGS stations and 261 domestic GPS stations,we attained the coseismic displacement and the time series of the station positions before and after the great Mw 9.0 Tohoku *** effects of Tohoku earthquake on different regions of china has been studied,which can provide the important information for Geodynamics *** time series and velocity of the GPS stations which has been affected by the earthquake has been also researched,and some advices on the method to update and maintain domestic geocentric coordinate frame is given in this paper.

关键词： Tohoku earthquake coseismic displacement time series velocity of coordinate geocentric reference frame

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基于对应分析的训练样本的选择

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测绘学报 2008年第2期37卷 190-195页

作者：虞欣郑肇葆北京市测绘设计研究院武汉大学遥感信息工程学院北京10003. 武汉大学遥感信息工程学院

本文提出一种基于对应分析的训练样本的选择方法。它从训练样本中自动地选择有代表性的典型训练样本,使得在自动分类中充分利用所采集的样本信息,以便得到满意的分类结果。通过实验与分析证明,该方法是可行的,它明显优于人工随机选择训... 详细信息

本文提出一种基于对应分析的训练样本的选择方法。它从训练样本中自动地选择有代表性的典型训练样本,使得在自动分类中充分利用所采集的样本信息,以便得到满意的分类结果。通过实验与分析证明,该方法是可行的,它明显优于人工随机选择训练样本的方式。与基于Q型因子分析的训练样本选择方法相比,可以更快地得到较少的典型样本,满意的分类精度。

关键词：对应分析因子分析训练样本影像分类

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