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Assessment of soil erosion and sediment delivery ratio using remote {1. and GIS:a case study of upstream Chaobaihe River catchment, north china

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International Journal of Sediment Research 2008年第2期23卷 167-173页

作者： Weifeng ZHOU1.and Bingfang WU2 1.Doctor candidate,Graduate School of the Chinese Academy of Sciences(CAS),Beijing 1.003.,{1. 2 Prof.,Institute of remote sensing Applications,Chinese Academy of Sciences(CAS),Beijing 1.01.1.{1. [a]Doctor candidate Graduate School of the Chinese Academy of Sciences(CAS) Beijing 1.003. china [b]Prof. Institute of remote {1. Applications Chinese Academy of Sciences(CAS) Beijing 1.01.1 china

Soil erosion in catchment areas reduces soil productivity and causes a loss of reservoir *** parametric models have been developed to predict soil erosion at drainage basins,hill slopes and field *** well-known Universal Soil Loss Equation(USLE) represents a standardized *** reservoir,which sits on Chaobaihe River,is the main surface source of drinking water for Beijing,the capital of *** and soil loss are the main reasons for sediment to enter a *** yield is assessed using a version of the universal soil loss equation modified by Chinese *** year 2001.and 2002 data for factors in the equation are obtained from remote {1. or collected to form an analysis *** factors are computed and mapped using Geographic Information System *** on the complex database,the modified model is *** pixel-based computing the sediment yield per hydrological unit is *** model does not consider sediment deposition occurring on *** soil loss is often higher than the sum of those measured at catchment *** sediment delivery ratio(SDR) per hydrological unit is also *** study analyzes the main contributions of sediment yields on sub-basins of the Chaobaihe River to the Miyun Reservoir,and discusses the possible reasons for the difference between SDRs in 2001.and 2002 at different *** result shows that in the upper basin of the Miyun Reservoir,in 2001.the area of erosion that could be neglected was 8,202.76 km2,the area of low erosion 3.269.59 km2,the area of moderate erosion 3.400.97 km2,the area of high erosion 43..89 km2,the area of strong erosion 52.1. km2 and the area of severe erosion 3.1.2}*** highest soil loss was 70,3.3.t/*** in Fengning County in 2001.followed by 64,41. t/*** by Chicheng County in *** SDR in 2002 was lower than that in *** main reasons are the decreasing rainfall erosivity and total runoff.

关键词： Modified USLE Gross erosion Sediment delivery ratio

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Image City sharing platform and its typical applications

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Science china(Information Sciences) 2011年第8期54卷 1738-1746页

作者： SHAO ZhenFeng & Li DeRen State Key Laboratory for Information Engineering in Surveying,Mapping and remote {1.,Wuhan University,Wuhan 43.079,china 1. State Key Laboratory for Information Engineering in Surveying Mapping and Remote Sensing Wuhan University Wuhan 430079 China

In this paper,the trend of urban spatial information sharing service from the electronic map to image is analyzed and its sharing framework based on service-oriented architecture is ***,the service implementation,feedback data service procedure and its processing service model are explored. Based on the software with independent intellectual property rights,image city of Taizhou is developed as an example to realize various image data and processing servicesLastly,the bright future prospects of image city are described.

关键词： Image City service-oriented architecture image data service function service model service

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The Genesis of the Damiao Granodiorite in Siziwangqi and Its Constraint on the Crust Evolution of Inner Mongolia

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地学前缘 2009年第S1期16卷 213-214页

作者： Yongmei Zhang,Huafeng Zhang,Weiping Zhu,Wencan Liu,Zhiguang Zhou 1.china University of Geosciences(Beijing),Beijing 1.008{1.china. 2.china Aero Geophysical Survey and {{1. sensing center for Land and Resources,Beijing 1.008{1.china

A large number of granitoids constitutes a giant granitic belt trending EW in the Inner *** a representative of those intrusions,the Damiao granitoid in Siziwangqi area may serve as a natural laboratory for the study ... 详细信息

关键词： mafic microgranular enclave granodiorite magma mixing Siziwangqi Inner Mongolia

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A common sense geographic knowledge base for GIR

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Science china(Technological Sciences) 2008年第S1期51卷 26-37页

作者： ZHANG Yi,GAO Yong,XUE LuLu,SHEN Si & CHEN KaiChen Institute of remote {1. and Geographic Information System,Peking University,Beijing 1.0871.china 1. Institute of remote {1. and Geographic Information System Peking University Beijing 100871 China

As background knowledge of geographic information retrieval (GIR),the gazetteers have their limitations. In this paper we propose to develop and implement a com-mon sense geographic knowledge base (CSGKB) instead of the gazetteers. We define that CSGKB is concerned with the representation of geographic knowledge in human brain and the simulation of geographic reasoning in daily life. Traditional geographic information system (GIS) is based on the model of map with its data based on geographic coordinates and its computation based on geometry. However,CSGKB,which is made up of geographic features and relationships and is based on qualitative spatio-temporal reasoning,can be viewed as the direct model of geographic world. This paper also discusses the characters of CSGKB and pre-sents its structure which is composed of knowledge base,inference engine,geo-graphic ontology and learner. The applications using CSGKB include geographic information retrieval (GIR),natural language processing (NLP),named entity rec-ognition (NER),Semantic Web,etc. At present,our work focuses on the design of geographic ontology and the implementation of the CSGKB knowledge base. In this paper we describe the CSGKB ontology structure,top ontology,geographic loca-tion ontology,spatial relationship ontology,and domain ontologies. Finally,we in-troduce the current state of implementation of CSGKB and give an outlook on our future researches.

关键词： geographic information retrieval common sense geographic knowledge base geographic ontology

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Atmospheric correction of HJ-1./B CCD images over Chinese coastal waters using MODIS-Terra aerosol data

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Science china(Technological Sciences) 2010年第S1期53卷 191-195页

作者： TIAN LiQiao 1.LU JianZhong 1.CHEN XiaoLing 1.2,3.YU ZhiFeng 1.XIAO JingJing 1.QIU Feng 1.& ZHAO Xi 1.1.State Key Laboratory of Information Engineering in Surveying,Mapping and {1. sensing,Wuhan University,Wuhan 43.079,china 2Key Laboratory of Poyang Lake Wetland and Watershed Research,Ministry of Education,Jiangxi Normal University,Nanchang 3.0022,china 3.The Key Laboratory of Poyang Lake Environment and Resource Utilization,Ministry of Education,Nanchang University,Nanchang 3.003.,china 1. State Key Laboratory of Information Engineering in Surveying Mapping and Remote Sensing Wuhan University Wuhan 430079 China 2. Key Laboratory of Poyang Lake Wetland and Watershed Research Ministry of Education Jiangxi Normal University Nanchang 330022 China 3. The Key Laboratory of Poyang Lake Environment and Resource Utilization Ministry of Education Nanchang University Nanchang 330031 China

This paper demonstrates an atmospheric correction method to process HJ-1./B CCD images over Chinese coastal waters with the aid of MODIS-Terra aerosol *** on the assumption of zero water-leaving radiance at the two near-infrared (NIR)bands or the shortwave infrared(SWIR)bands,the atmospheric aerosol optical depth(AOD)is firstly retrieved from MODIS-Terra with a simple extension of the NIR-SWIR combined atmospheric correction approach embedded in SeaDAS (SeaWiFS data analysis system).Then the"turbid"and"non-turbid"waters are separated by the turbid water *** probability of AOD at 551.nm band is derived based on the NIR information over"non-turbid"waters and FLAASH model is selected to do the atmospheric correction of the HJ-1./B CCD imagery using the AOD values of highest probabilities as ***,according to the histogram of the AOD distribution at 551.nm band,the studied turbid water area is divided into several blocks and HJ-1./B CCD imagery is corrected with the corresponding AOD values displayed with the highest frequency in each *** method has been applied to several HJ-1./B images over Chinese coastal waters and validated by synchronous in-situ *** results have shown that this method is effective in the atmospheric correction process of HJ-1./B CCD images for ocean color remote {1. study and application in the coastal waters.

关键词： ocean color remote sensing atmospheric correction turbid coastal waters HJ-1./B MODIS

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A fusion algorithm for remote {1. 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 {1. sensing,Wuhan University,Wuhan 43.079,china 2 College of Sciences,Wuhan University of Science and Technology,Wuhan 43.065,china 3.tate Key Laboratory of Satellite Ocean Environment Dynamics,Second Institute of Oceanography,State Oceanic Administration,Hangzhou 3.001.,china 4 Spatial Information Technology Application Research Institute,Changjiang River Scientific Research Institute,Wuhan 43.01.,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 {1. 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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Aerosol optical depth retrieval by HJ-1.CCD supported by MODIS surface reflectance data

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Science china Earth Sciences 2010年第S1期53卷 74-80页

作者： SUN Lin1.2,SUN ChangKui1.LIU QinHuo2 & ZHONG Bo2 1.eomatics College,Shandong University of Science and Technology,Qingdao 26651.,china 2State Key Laboratory of {1. sensing Science,Chinese Academy of Sciences,Beijing 1.01.1.china 1. Geomatics College Shandong University of Science and Technology Qingdao 266510 China2. State Key Laboratory of Remote Sensing Science Chinese Academy of Sciences Beijing 100101 China

The high spatial resolution and temporal observation frequency of HJ-1.CCD make it suitable for aerosol ***,because of the lack of a shortwave infrared band,it is difficult to use HJ-1.CCD imagery to retrieve aerosol optical depth(AOD).We developed a new algorithm for HJ-1.CCD AOD retrieval by introducing MODIS surface reflectance outputs(MOD09) as *** this algorithm HJ-1.CCD blue band surface reflectance was retrieved through MOD09 blue band surface reflectance by band matching of the two *** at 550 nm was then generated through a pre-calculated look-up table for HJ-1.*** HJ-1.CCD images covering the Jing-Jin-Tang(Beijing-Tianjin-Tangshan) region were used to retrieve AOD using the new algorithm,and the AODs were then validated using AERONET ground measurements in Beijing and *** validation shows that compared with AERONET ground measurements,27/29 AODs have error less than 0.1.in absolute value.

关键词： HJ-1.CCD surface reflectance spectrum conversion aerosol optical depth

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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 Liu1.State Key Laboratory of remote {1. Science,Jointly Sponsored by Beijing Normal University and the Institute of remote {1. Applications of Chinese Academy of Sciences,Beijing 1.0875,china 2Department of Geodesy and Geomatics,School of Land Science and Technology,china University of Geosciences,Beijing 1.0083.china 1. State Key Laboratory of remote {1. 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

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Assessing Reclamation Levels of Coastal Saline Lands with Integrated Stepwise Discriminant Analysis and Laboratory Hyperspectral Data

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Pedosphere 2006年第2期16卷 154-160页

作者： SHI Zhou CHENG Jie-Liang HUANG Ming-Xiang ZHOU Lian-Qing Institute of Agricultural remote {1. and Information System Zhejiang University Hangzhou 310029 （China）. State Key Laboratory of remote {1. Science Institute of Remote Sensing Application Chinese Academy of Sciences Beijing 100101 （China）

At different times over the past 3. years in Zhejiang Province, {1., the coastal tidelands have been successively enclosed and reclaimed for agricultural land use. The purpose of this work was to evaluate whether laboratory hyperspectral data might be used to estimate the physicochemical characteristics of these reclaimed saline soils. A coastal region of Shangyu City (Zhejiang Province), which was grouped into four subzones according to reclamation history, was used as the study area, and soil samples were collected in each subzone. Physicochemical analyses showed that the soils were characterized by high electrical conductivity and sand content with low organic matter; the longer the saline lands had been reclaimed, the lower were the electrical conductivity and sand content and the higher the organic matter content. These changing trends of soil chemical and physical properties were found in laboratory reflectance spectra of soil samples and their first-order derivative curves. Stepwise discriminant analysis (SDA) identified six salient spectral bands at 488, 53., 670, 880, 1.00, and 1.00 nm. Using derived discriminant functions for saline lands with different historical years of reclamation, classification revealed an overall accuracy from a self-test of 86.6% and from cross-validation of 89.3.. Therefore, as opposed to time-consuming field investigations, this study suggested that remotely sensed hyperspectral data could serve as a promising measure to assess the reclamation levels of coastal saline lands.

关键词： hyperspectra reclamation remote {1. saline soil SDA

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An improved line-of-sight method for visibility analysis in 3. complex landscapes

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Science china(Information Sciences) 2010年第11期53卷 2185-2194页

作者： LIU Liu1. ZHANG LiQiang1. MA JingTao2, ZHANG Liang3. ZHANG XingMing1. XIAO ZhiQiang1.& YANG Ling1.1.tate Key Laboratory of {1. sensing Science, Jointly Sponsored by Beijing Normal University and the Institute of {1. sensing Applications of Chinese Academy of Sciences, Beijing 1.0875, china 2PTV America, Inc. 1.45 Broadway Plaza Ste 605, Tacoma, WA 98407, USA 3.chool of Geomatics and Urban Information, Beijing University of Civil Engineering and Architecture, Beijing 1.0044, china 1. State Key Laboratory of remote {1. Science Jointly Sponsored by Beijing Normal University and the Institute of Remote Sensing Applications of Chinese Academy of Sciences Beijing 100875 China2. PTV America Inc. 1145 Broadway Plaza Ste 605 Tacoma WA 98407 USA3. School of Geomatics and Urban Information Beijing University of Civil Engineering and Architecture Beijing 100044 China

This paper presents an efficient method for implementing visibility analysis on complex landscapes based on an improved LOS (line of sight) algorithm. The method determines the viewshed by analyzing the geometric relationship between the target points and viewpoint. It differentiates the visibility of the target points by the elevation information. Eventually the visual results related to the given viewpoint are rendered on three-dimensional landscapes. The visibility of some target points is computed by comparing their elevations with the viewpoint's height, thus is able to enhance the efficiency of the visibility analysis. This method can not only be applied in the visibility analysis of forest scenes, but also used in the analysis of the urban environment. Experiments show that the proposed method results in high efficiency and precision.

关键词： line of sight visibility analysis complex landscapes visual permeability

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