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A fusion algorithm for remote sensing images based on nonsubsampled pyramids and bidimensional empirical decomposition

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Science china(Technological Sciences) 2010年第S1期53卷 196-204页

作者： ZHANG XiaoDong 1,WANG WenBo 2,WANG DiFeng 3 & ZHANG Yu 4 1 State Key Laboratory of information Engineering in Surveying,Mapping and Remote Sensing,wuhan University,wuhan 430079,china 2 College of Sciences,wuhan University of Science and technology,wuhan 430065,china 3State Key Laboratory of Satellite Ocean Environment Dynamics,Second institute of Oceanography,State Oceanic Administration,Hangzhou 310012,china 4 spatial information technology application research institute,changjiang river scientific research institute,wuhan 43.010,china wuhan Univ State Key Lab Informat Engn Surveying Mapping & R Wuhan 430079 Peoples R China wuhan Univ Sci & Technol Coll Sci Wuhan 430065 Peoples R China State Ocean Adm Inst Oceanog 2 State Key Lab Satellite Ocean Environm Dynam Hangzhou 310012 Zhejiang Peoples R China changjiang river Sci Res Inst Spatial Informat Technol Applicat Res Inst Wuhan 430010 Peoples R China

In order to improve the quality of remote sensing image fusion,a new method combining nonsubsampled Laplacian pyramid (NLP)and bidimensional empirical mode decomposition(BEMD)is ***,the high resolution panchromatic image (PAN)is decomposed using NLP until the approximate component and the low resolution multispectral image(MS)contain features with a similar ***,the approximation component and the MS are decomposed by BEMD,resulting in a number of bidimensional intrinsic mode functions(BIMF)and a residue *** instantaneous frequency is computed in 4 directions of the *** the positive or negative coefficients in the corresponding position,a weighted algorithm is designed for fusing the high frequency details using the instantaneous frequency and the coefficient absolute value of the BIMFs as fusion *** fused image is then obtained through inverse BEMD and *** results have illustrated the advantage of this method over the IHS,DWT andà-Trous wavelet in both spectral and spatial detail qualities.

关键词： bidimensional empirical mode decomposition nonsubsampled pyramid instantaneous frequency remote sensing image fusion

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Integral ear elimination and virtual point-based updating algorithms for constrained Delaunay TIN

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Science china(Technological Sciences) 2008年第S1期51卷 135-144页

作者： WU LiXin1,2,WANG YanBing2,3 & SHI WenZhong2,4 1 institute for Geo-informatics & Digital Mine research,Northeastern University,Shenyang 110004,china 2 institute for GIS/RS/GPS & Subsidence Engineering research,china University of Mining & technology,Beijing 100085,china 3 Laboratory of 3D information Acquisition & application,Capital Normal University,Beijing 100037,china 4 Center for Advanced GIS research,LSGI,Polytechnic University Hong Kong,Hong Kong,china Northeastern Univ Inst Geoinformat & Digital Mine Res Shenyang 110004 Peoples R China china Univ Mining & Technol Inst GIS RS GPS & Subsidence Engn Res Beijing 100085 Peoples R China Capital Normal Univ Lab Informat Acquisit & Applicat Beijing 100037 Peoples R China Hong Kong Polytech Univ LSGI Ctr Adv GIS Res Hong Kong Hong Kong Peoples R China

Constrained Delaunay Triangular Irregular Networks (CD-TIN),a kind of special data structure,have many practical applications in Geoinformatics,especially in the representation of linear constrained triangulation for DTM and DSM,such as in digital city and digital mine. Past researches on D-TIN mainly focused on point in-sertion and deletion without consideration of constraint,and that on CD-TIN usu-ally paid more attention to the insertion algorithms for points and edges,but little to the deletion algorithms. The presented algorithms are far insufficient for the dy-namic updating of CD-TIN. In this paper,the constraint edge in CD-TIN is consid-ered to be any set of broken lines,i.e.,polygon edges,broken lines and simple segments. The constraint edge may be composed of one or more constraint seg-ments,and it is allowed to be in any form: Open or close,intersection or self-in-tersection. By improving to present insertion and deletion algorithms for D-TIN,two new algorithms for CD-TIN updating are presented. According to the polymorphism of the constraints in CD-TIN,virtual point is adopted to represent the crossing node between constraint edges when a constraint edge is inserted in CD-TIN. Two new algorithms named as Integral Ear Elimination (IEE) and Influence Domain Retrian-gulation for Virtual Point (IDRVP) are presented,the former is for constraint point deletion,while the later is for the insertion and deletion of constraint edge. The principle of IDRVP is that to divide the influence domain of a virtual point into some parts by the constraint-keeping edges,and to retriangulate each part of the influ-ence domain individually referring to the constraint visible property and constraint empty circle (CEC) criterion. Finally,a prototype system is developed with VC++,one case on the integration of 3D terrain and buildings is demonstrated to test the correctness of new algorithms. It shows that the new algorithms are effective for the updating of CD-TIN.

关键词： Delaunay TIN spatial constraint data updating spatial modeling polymorphism digital mine

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Monitoring of Carbon Dioxide and Methane Emission from the Shuibuya Reservoir over the Qingjiang river Basin,china

Monitoring of Carbon Dioxide and Methane Emission from the S...

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2011 International Symposium on Water Resource and Environmental Protection(ISWREP 2011)

作者： Zhao Dengzhong Chen Yongbo Department of Science and technology & Environment Protection china Three Gorges Corporation Yichang P.R. china Zhao Dengzhong Tan Debao Wang Zhaohui spatial information technology application Department changjiang river scientific research institute wuhan P. R. china

Greenhouse gas concentration in the atmosphere has already grown continuously due to the usage of fossil fuels and other anthropogenic activities since industrial revolution. The improvement of greenhouse gas concentration maybe results in climate change and redistribution of water resources. So more and more attentions were paid to low-carbon or clean energy exploitation in order to meet the energy demand of economic and social development. Hydropower is an important clean energy which would not produce greenhouse gas directly. But the construction of dam maybe change regional climate, aquatic ecosystem and the distribution of carbon cycle in water body of reservoir. So greenhouse gas emission from freshwater reservoir was monitored and analyzed at the Shuibuya reservoir over the Qingjiang river Basin, china in this paper. The floating chamber was used to measure carbon dioxide and methane fluxes at the water-atmosphere interface of water body. All measurement points are distributed in the upstream, middle, tributary or bay, and drawdown zone of the Shuibuya reservoir respectively. Data analysis indicated that carbon dioxide fluxes at all measurement points were below 800 mg.m-2.d-1 and methane fluxes was below 8.0 mg.m-2.d-1 at Sep. 03, 2010. The navigated measurement showed the slightly improved trend of carbon dioxide and methane concentration from upstream to dams of the reservoir. So it is concluded that the Shuibuya reservoir releases carbon dioxide and methane to the atmosphere from water body at Sep. 3, 2010, but the emission amount is very small and could be neglected compared to lakes, wetland and other natural water body.

关键词： greenhous gas emission the shuibuya reservoir monitoring carbon dioxide methane

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Preliminary Study in spatial Data Warehouse of Flood Control and Disaster Mitigation in Yangtze river Basin

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人民长江 2002年第Z1期33卷 90-92页

作者： ZHAN Xiao guoSenior engineer, Yangtze river scientific research institute, changjiang Water Resources Commission, wuhan 43.010, china Senior engineer Yangtze River Scientific Research Institute Changjiang Water Resources Commission Wuhan 430010 China

Since 1990s,the spatial data warehouse technology has rapidly been developing, but due to the complexity of multi-dimensional analysis, extensive application of the spatial data warehouse technology is affected. In the light of the characteristics of the flood control and disaster mitigation in the Yangtze river basin, it is proposed to design a scheme about the subjects and data distribution of the spatial data warehouse of the flood control and disaster mitigation in Yangtze river basin, i.e., to adopt a distributed scheme. The creation and development of the spatial data warehouse of the flood control and disaster mitigation in Yangtze river basin is presented .The necessity and urgency of establishing the spatial data warehouse is expounded from the viewpoint of the present situation being short of available information for the flood control and disaster mitigation in Yangtze river basin.

关键词： spatial data warehouse distributional scheme flood control and disaster mitigation Yangtze river

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A prototype auto-human support system for spatial analysis

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Progress in Natural Science:Materials International 2006年第9期16卷 954-966页

作者： LI Lianfa and WANG Jinfeng (State Key Laboratory of Resources & Environmental information System, institute of Geographical Sciences & Natural Resources research, Chinese Academy of Sciences, Beijing 100101, china) [a]State Key Laboratory of Resources & Environmental information System Institute of Geographical Sciences & Natural Resources Research Chinese Academy Sciences Beijing China

spatial analysis is a multidisciplinary field that involves multiple influential factors, variation and uncertainty, and modeling of geospatial data is a complex procedure affected by spatial context, mechanism and assumptions. In order to make spatial modeling easier, some scholars have suggested a lot of knowledge from exploratory data analysis (EDA), specification of the model, fitness and diagnosis of the model, to interpretation of the model. Also an amount of software has improved some functionalities of spatial analysis, e. g. EDA by the dynamic link (GeoDa) and robust statistical calculation (R). However, there are few programs for spatial analysis that can automatically deal with unstructured declarative issues and uncertainty in machine modeling using the domain knowledge. Under this context, this paper suggests a prototype support system for spatial analysis that can automatically use experience and knowledge from the experts to deal with complexity and uncertainty in modeling. The knowledge base component, as the major contribution of the system, in support of the expert system shell, codes and stores declarative modeling knowledge, e.g. spatial context, mechanisms and prior knowledge to deal with declarative issues during the modeling procedure. With the open architecture, the system integrates functionalities of other components, e.g. GIS’ visualization, DBMS, and robust calculation in an interactive environment. An application case of spatial sampling, design and implementation of spatial modeling with such a system is demonstrated.

关键词： spatial analysis automatic support system modeling of spatial data artificial inference for modeling.

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Structural patterns of land types and optimal allocation of land use in Qinling Mountains

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Journal of Geographical Sciences 2001年第1期11卷 99-109页

作者： LIU Yan-sui, DENG Xiang-zheng (institute of Geographic Sciences and Natural Resources research, CAS, Beijing 100101, china) institute of Geographic Sciences and Natural Resources research CAS Beijing China

The case study based on Qinling Mountains in Shaanxi Province of china, in virtue of the information from TM image, classifies the land types and analyzes their spatial and temporal differential law, and puts forward three structural patterns of land types in mountainous areas, namely, spatial, quantitative and qualitative structures of mountainous land types. Furthermore, it has been noticed that the analysis of structural patterns can disclose the heterogeneity and orderliness of combination of land types, which can lay the theoretic foundation for comprehensively recognizing ecological characteristics and succession law of structure and function of land types. After the all-around comparative analysis, an optimal allocation of land use in Qinling Mountains has been put forward according to the principle of sustainable development and landscape ecology, which can lay the scientific foundation in practice for the structural adjustment and distribution optimization from the macro level to micro level.

关键词： land types succession of land types structural patterns optimal allocation Qinling Mountains

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Matrix calculation of high-dimensional cross product and its application in automatic recognition of the endmembers of hyperspectral imagary

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Science china(information Sciences) 2011年第1期54卷 197-203页

作者： GENG XiuRui1,ZHAO YongChao1,LIU SuHong2 & WANG FuXiang3 1Key Laboratory of technology in Geo-spatial information Processing and application System, institute of Electronics,Chinese Academy of Sciences,Beijing 100080,china 2State Key Laboratory of Remote Sensing Science,Jointly Sponsored by Beijing Normal University and the institute of Remote Sensing applications of Chinese Academy of Sciences, School of Geography,Beijing Normal University,Beijing 100875,china 3School of Electronics and information Engineering,Beihang University,Beijing 100191,china 1. Key Laboratory of technology in Geo-spatial information Processing and application System Institute of Electronics Chinese Academy of Sciences Beijing 100080 China2. State Key Laboratory of Remote Sensing Science Jointly Sponsored by Beijing Normal University and the Institute of Remote Sensing Applications of Chinese Academy of Sciences School of Geography Beijing Normal University Beijing 100875 China3. School of Electronics and Information Engineering Beihang University Beijing 100191 China

This paper gives the definition of the high-dimensional cross product and its calculation by extending the 3-D cross product definition into the high-dimensional vector *** on the properties of the cross product,the volume variance index(VVI)is proposed to be used in extracting automatically the endmembers of the hypherspectral imagery which eliminates the shortcoming of the traditional method of using simplex only where the extraction results were easily impacted by the abnormal pixels.A case study of endmembers extraction experiment using the VVI method with the AVIRIS data for Cuprite has shown a very good result.

关键词： endmember simplex hyperspectral imagery cross product

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Channel characterization at 120 GHz for future indoor communication systems

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Chinese Physics B 2013年第5期22卷 650-656页

作者：陈镇曹俊诚 Key Laboratory of Terahertz Solid-State technology Shanghai Institute of Microsystem and Information TechnologyChinese Academy of Sciences

We present a simulation on the spatial and temporal characteristics of the indoor propagation channel at 120 GHz. The simulation, applied to a dynamic scenario with randomly placed objects and moving people in a room, is based on a three-dimensional ray-tracing method. Propagation and reflection mechanisms of electromagnetic waves are discussed in the channel model. The received power in a 0.95-m-height plane is obtained. Comparison between walls and ceiling covered with dielectric mirrors and those with three common wall and ceiling materials are presented. The result shows that the holistic received power level with dielectric mirrors is about 10 dB higher than with other materials.

关键词： sub-terahertz communication channel models ray tracing electromagnetic propagation

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GIS and ANN model for landslide susceptibility mapping

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Journal of Geographical Sciences 2001年第3期11卷 374-381页

作者： XU Zeng-wang (State Key Laboratory of Resources and Environment information System, institute of Geographic Sciences and Natural Resources research, CAS, Beijing 100101, china) State Key Laboratory of Resources and Environment information System Institute of Geographic Sciences and Natural Resources Research CAS

Landslide hazard is as the probability of occurrence of a potentially damaging landslide phenomenon within specified period of time and within a given area. The susceptibility map provides the relative spatial probability of landslides occurrence. A study is presented of the application of GIS and artificial neural network model to landslide susceptibility mapping, with particular reference to landslides on natural terrain in this paper. The method has been applied to Lantau Island, the largest outlying island within the territory of Hong Kong. A three-level neural network model was constructed and trained by the back-propagate algorithm in the geographical database of the study area. The data in the database includes digital elevation modal and its derivatives, landslides distribution and their attributes, superficial geological maps, vegetation cover, the raingauges distribution and their 14 years 5-minute observation. Based on field inspection and analysis of correlation between terrain variables and landslides frequency, lithology, vegetation cover, slope gradient, slope aspect, slope curvature, elevation, the characteristic value, the rainstorms corresponding to the landslide, and distance to drainage Une are considered to be related to landslide susceptibility in this study. The artificial neural network is then coupled with the ArcView3.2 GIS software to produce the landslide susceptibility map, which classifies the susceptibility into three levels: low, moderate, and high. The results from this study indicate that GIS coupled with artificial neural network model is a flexible and powerful approach to identify the spatial probability of hazards.

关键词： GIS artificial neural network model landslide susceptibility mapping

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Framework and development of digital china

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Science china(Technological Sciences) 2008年第S1期51卷 1-5页

作者： WU Lun & TONG QingXi institute of Remote Sensing and Geographical information Systems,Peking University,Beijing 100871,china 1. institute of Remote Sensing and Geographical information Systems Peking University Beijing 100871 China

Digital china (DC) has recently drawn much attention. It is a strategic project for china in response to the challenge of sustainable development of population,re-source,and environment. Intending to establish the national information infra-structure (NⅡ),the DC project forms a solid foundation for Chinese informatization. In such an NⅡ,multi-sourced spatial data are integrated. They focus on various themes and have different space and time features. Based on the NⅡ,numerous applications and services can be developed so that spatial information will benefit everyone. Since lots of organizations,such as governments,universities,and en-terprises,are involved in the implementation of DC,the DC project will significantly prompt the relevant scientific research as well as economic progress in china.

关键词： Digital Earth Digital china spatial information sciences and technology

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