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Study on NDVI-T_s space by combining LAI and evapotranspiration

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Science china Earth Sciences 2006年第7期49卷 747-754页

作者： HAN Lijuan1,2.3. WANG Pengxin4, YANG Hua1,2.3. LIU Shaomin1,2.3.& WANG Jindi1,2.3.1. Research Center for remote Sensing and gis, School of Geography, {2. normal university, beijing 1.0875, china 2. State Key Laboratory of remote Sensing Science, beijing 1.0875, china 3. {2. Key Laboratory for remote Sensing of Environment and Digital Cities, beijing 1.0875, china 4. Department of Information Management, College of Information and Electronic Engineering, china Agricultural university, {2. 100083. china Research Center for remote Sensing and {1. School of Geography Beijing Normal University Beijing China State Key Laboratory of remote Sensing Science Beijing China beijing Key Laboratory for {1. Sensing of Environment and Digital Cities Beijing China Department of Information Management College of Information and Electronic Engineering China Agricultural University Beijing China

This paper focuses on interpreting the different spatial relationships between NDVI and Ts, a triangular or a trapezoid, and on analyzing transformation conditions, the physical and ecological meanings of the vegetation index-surface temperature space as well. Further, we use the Tempera-ture-Vegetation Dryness Index (TVDI) to explain the existent meaning of a triangular space after NDVI reaches its saturated state by employing the relationships between NDVI, LAI and evapotranspiration. The specific relations between NDVI and Ts are useful for describing, validating and updating land surface models.

关键词： NDVI, land surface temperature, evapotranspiration, leave area index.

The correlation of multi-angle thermal infrared data and the choice of optimal view angles

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Science china Earth Sciences 2004年第6期47卷 570-576页

作者： FAN Wenjie1 & XU Xiru1,2.1.Institute of remote Sensing and gis of Peking {2.,beijing 100871,china 2.Center of remote Sensing and gis of beijing normal {2.,beijing {13.,china Institute of remote Sensing and {1. of Peking {2. Beijing China Center of remote Sensing and {1. of {2. {3. university Beijing China

Based on the matrix formula of thermal infrared radiant system, the components temperature can be retrieved by the inversive matrix. Around the stability problem of retrieved result, the research work we did was focused on (i) the correlation of (wk,j) which is the key to affect the retrieval accuracy, (ii) a general method which can help us find the number of retrievable parameters and evaluate the retrieval error before its performance, (iii) the choice of “optimal viewing angle group” based on the formula of absolute error propagation. The row winter wheat field was chosen as an example. The results can provide a theoretical basis for multi-angle thermal infrared remote sensing and components temperature retrieval.

关键词： components temperature retrieval, correlation, number of retrievable parameters, optimal viewing angle group.

Estimating surface evapotranspiration using combined MODIS and CBERS-02.data

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Science china(Technological Sciences) 2005年第S2期48卷 145-160页

作者： XIN Xiaozhou1,2. LIU Qinhuo1, TANG Yong1,3. TIAN Guoliang1, GU Xingfa1, LI Xiaowen1,2. ZHENG Hongsheng4 & CHEN Jiayi4 1. State Key Laboratory of remote Sensing Science, Institute of remote Sensing Applications, Chinese Academy of Sciences, {2. 100101, china 2. Research Center for remote Sensing and gis, Department of Geography, {2. normal university, beijing 1.0875, china 3. Graduate university of Chinese Academy of Sciences, {2. 10003., china 4. Department of Atmospheric Physics, Peking university, {2. 100871, china State Key Laboratory of remote Sensing Science Institute of Remote Sensing Applications Chinese Academy of Sciences Beijing China Research Center for remote Sensing and {1. Department of Geography Beijing Normal University Beijing China Graduate university of Chinese Academy of Sciences Beijing China Department of Atmospheric Physics Peking University Beijing China

Spatial scale error is one of the most serious problems in the estimates of land surface heat fluxes of sensible and latent from satellite-borne data such as MODIS 1.m resolution reflectance and emissive data. One of the feasible and economic ways to decrease the spatial scale error is to use high resolution land use class data together with the MODIS data. CBERS-02.data were used to produce land use class of Baiyangdian area, Hebei Province,{1. in the autumn of 2.04. The area ratio of each class in MODIS pixel was calculated, and used to derive the heat fluxes of the mixed pixel. The results showed that the estimated heat fluxes of soil, sensible and latent have been changed remarkably after using the high resolution land class data. It could be concluded from the comparison between simulated and ground-measured fluxes as well as the theoretical analysis that high resolution land class data are useful to diminishing the scale error of heat fluxes estimated from low resolution satellite data.

关键词： surface evapotranspiration spatial scale error MODIS CBERS land class.

Calculating soil moisture by remote sensing and analyzing hydrologic cycle process in the Yellow River basin

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Science china(Technological Sciences) 2004年第Z1期47卷 1-13页

作者： YANG Shengtian1.& LIU Changming1. 2.1. School of Environmental Sciences, {1. normal {2., beijing 1.0875, china 2. Institute of Geographic Science and Natural Resources Research, {1. 1.01.1. china School of Environmental Sciences Beijing Normal University Beijing China Institute of Geographic Science and Natural Resources Research Beijing China

Based on the AVHRR pathfinder remote sensing data, soil moisture, precipitation and evaporation during the period of 1.8{1.1.98, soil moisture of all layers of soil-profile (0—1.m) in the Yellow River basin over the 1. years are calculated by the remote sensing model of calculating soil water. The Yellow River basin is divided into seven subcatchments as control sections at the location of six hydrologic stations (Lanzhou, Toudaoguai, Longmen, Sanmenxia, Huayuankou and Lijin). After calculating soil moisture and obtaining runoff data and precipitation data, the dynamical features of hydrological cycle in the Yellow River basin are analyzed for the period from 1.8{1.to 1.88 using water balance method. The conclusions are as follows: It is feasible to calculate the soil water on the macro-scale, in the soil profile with temporal continuity by means of remote sensing and survey in land. Some values of the key water cycle factors in the Yellow River are obtained, which include the annual precipitation of 4000 km3. the evapotranspiration of 3.00-3.00 km3. and the soil moisture transformation of ?500- 500 km3. Consequently, we analyzed the process of the water cycle in the Yellow River over the 1. years, and the results show that the segment upstream of Lanzhou city is a relatively humid region, and the area of internal waters and the reaches of Shanshan is the most desiccated region. Therefore, the runoff in the depth process is intensive and the runoff-generating process is weak in more arid regions.

关键词： the Yellow River, soil moisture, remote sensing, hydrologic cycle.

3. building modeling,organization and application in digital city system

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Science china(Technological Sciences) 2010年第S1期53卷 134-142页

作者： YANG Xue 1,WENG JingNong 1,2.XIA YuBin 2.WU Lun 3.& SUI ZhengWei 3.1 College of Software,Beihang university,{3. 100191,{2. 2.College of Computer,Beihang university,{3. 100191,{2. 3.Institute of remote Sensing and gis,Peking university,{3. 100871,{2. College of Software Beihang University Beijing China College of Computer Beihang University Beijing China Institute of remote Sensing and {1. Peking University Beijing China

The real world is a three-dimensional(3.)space requiring that 3. geospatial information applications be developed in alignment with the observer’s visual and perceptive ***,3. building model data are required in a wide range of areas such as urban planning,environmental protection,real estate management and emergency *** the same time,the development of Web service[LU1.technologies allows the possibility of the widely distributed 3. geospatial data on the web.3. city building model with its related information is an important part in the construction of a digital city system,and has become a staple resource on the web *** view of the hierarchical representation of a 3. building model,an abstract of a 3. building model based on structure details is studied,and a novel representation approach named 3. transparent building hierarchical model is presented in this *** approach fully uses both the existing 3. modeling technologies and CAD constructing mapping *** the spatial relationship description,structural components inside a building can be represented and integrated as hierarchical models in a unified 3. *** addition,based on the characteristics of the 3. building model data,a service-oriented architecture and Web service technologies for 3. city building models are *** aim of the approach is that 3. city building models can be used as a kind of data resource service on the web,and can also exist independently in various different web applications.

关键词： 3. modeling 3. transparent building hierarchical models china Star web services

Test of magnetic susceptibility and grain-size age models of loess

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Progress in Natural Science:Materials International 2007年第11期17卷 1312-1317页

作者： Chen Yimeng1,2.3. Feng Zhaodong4 and Gong Huili1,2.1. MOE and Key Laboratory of Resources Environment and gis of {3., {3. 10003., china 2. Key Laboratory of 3. information Acquisition and Application, The Capital normal university, {3. 10003., china 3. Department of Economics & Management of Huizhou university, Huizhou 516007, china 4. Key Laboratory of Western china’s Environmental Systems, Ministry of Education, Lanzhou university, Lanzhou 73.000, china) Key Laboratory of Resources Environment and gis of {1. Beijing 100037 China Key Laboratory of 3. information Acquisition and Application Capital Normal University Beijing 100037 China Department of Economics and Management Huizhou University Huizhou 516007 China Key Laboratory of Western china's Environmental Systems Lanzhou University Lanzhou 730000 China

Ages of the stratigraphic boundary MIS1.2.and MIS{1.4 of the Yuanbu loess section in Linxia are used as the basis of the nodal control age. The age of MIS1.2.and MIS{1.4 are obtained from the latest international research result—the climatic events recorded in the stalagmite in the Hulu Cave in Nanjing, that MIS1.2.is 1..5 kaB.P. and MIS{1.4 is 59.8 kaB.P.. The ages of the two climatic events contain three nodal age control models (Model 1. 0 kaB.P.—59.8 kaB.P.; Model 2. 0 kaB.P.—1..5 kaB.P. and 1..5 kaB.P.—59.8 kaB.P.; Model {1. 1..5 kaB.P.—59.8 kaB.P.), which are used as the nodal control age separately. The deposition times of various stratigraphic horizons are calculated by using the magnetic susceptibility age model and grain-size age model, and then compared with each other. In addition, the AMS1.C age, OSL age and the ages of YD and H events are compared with the ages of the corresponding horizons calculated by the three models of nodal control ages. From the analyses of lithologic characters and climatic stages it has been found that both the magnetic susceptibility age model and the grain-size age model have some defects. Because the accurate control ages are selected as the nodal points of the glacial period or interglacial period, the stratigraphic deposition times determined by the high resolution of magnetic susceptibility age model and grain-size age model approximate to the actual ages. As for the relative accuracy of the two age models, the magnetic susceptibility age model is more accurate than the grain-size age model.

关键词： loess nodal control age magnetic susceptibility age model grain-size age model test

Automatic generalization of metro maps based on dynamic segmentation

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Science china(Technological Sciences) 2010年第S1期53卷 158-165页

作者： DONG WeiHua 1.TIAN Yuan 2.& ZHANG Yi 2.1.Institute of Geography and remote Sensing,{3. {2. university,{3. 1.0875,china 2.Institute of remote Sensing and Geographic Information System,Peking university,{3. 1.0871.china Institute of Geography and remote Sensing Beijing Normal University Beijing China Institute of remote Sensing and Geographic Information System Peking University Beijing China

A metro map is usually optimized for the readability of connections and transportation networks *** order to assure good readability and meet aesthetic considerations,a set of principles for good metro map layout are *** to these principles,a new methodology based on dynamic segmentation is presented to produce the metro maps ***,routes are constructed according to the line attribute similarity and geometry *** a set of cartographic generalization methods about the shape,angle,length,and topology are presented for these *** method is validated by beijing metro plan *** the experiment results,it can be concluded that this new method is more effective than the static segmentation method to produce metro maps with better readability for route plans.

关键词： metro maps generalization dynamic segmentation visualization

Effective solutions to a global 3. visual system in networking environments

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Science china Earth Sciences 2005年第11期48卷 2032-2039页

作者： ZHANG Liqiang1,2. ZHANG Yan3. YANG Chongjun2. LIU Suhong1, REN Yingchao2. RUI Xiaoping2.& LIU Donglin2.1. State Key Laboratory of remote Sensing Sciences, School of Geography and remote Sensing, {2. normal university, beijing 1.0875, china 2. State Key Laboratory of remote Sensing Sciences, Institute of remote Sensing Applications, Chinese Academy of Sciences, {2. 101001, china 3. Institute of Geographical Sciences and Natural Resources Research, Chinese Academy of Sciences, {2. 101001, china State Key Laboratory of remote Sensing Sciences School of Geography and Remote Sensing Beijing Normal University Beijing China Chinese Academy of Sciences State Key Laboratory of Remote Sensing SciencesInstitute of Remote Sensing Applications China Institute of Geographical Sciences and Natural Resources Research Chinese Academy of Sciences China

The development of Web-based global 3. visual system has made progresses. However, there exist few mature and effective ways for managing, transmitting and visualizing massive spatial data. Based on the related work, the paper illustrates the ellipsoidal quadtree technique for rapid access multi-scale and multiple level geographical data, integrates the streaming with level-of-detail rendering method for transmitting the data on the network, and im-plements large-scale terrain surface simplification using M-band wavelet transforms and mul-tiresolution triangulations. We fulfil a web-based global terrain visual system using COM com-ponents on the basis of the above techniques. The system has a good prospect in the military simulation and city plans.

关键词： massive spatial data, streaming transmission, system architecture, M-band wavelet

A distributed hydrological model with its application to the Jinghe watershed in the Yellow River Basin

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Science china(Technological Sciences) 2004年第Z1期47卷 60-71页

作者： WANG Zhonggen1. ZHENG Hongxing1. LIU Changming1. , WU Xianfeng2.2.& ZHAO Weimin3.1. Key Laboratory of Water Cycle & Related Land Surface Processes, Institute of Geographic Science and Natural Resources Research, Chinese Academy of Sciences, beijing 1.01.1.{3. 2. Institute of Environmental Science, beijing normal university, beijing 1.0875,{3. 3. Water Resources Conservation Committee of Yellow River, Zhengzhou 450003.{3. Key Laboratory of Water Cyde & Related Land Surface Processes Institute of Geographic Science and Natural Resources Research Chinese Academy of Sciences Beijing China Institute of Environmental Science Beijing Normal University Beijing China Water Resources Conservation Committee of Yellow River Zhengzhou China

For the purpose of water resources management in the Yellow River Basin with highly spatial difference, a daily distributed hydrological model was proposed, of which the determination of spatially-distributed parameters and model inputs processing were performed by means of gis/RS. In the model, the computation of runoff yield was based on the topography index method and flow routing was modeled by Maskingum method. The operation of the model is followed by means of “command structure” technique based upon the topography of river network. A case study using the model was conducted for the Jinghe watershed, which locates at the middle Yellow River Basin. The simulation of the hydrological processes in 1.96 has shown that water quantity balance errors were less than 5% and the Nash-Sutcliffe coefficient arrived at 0.7, indicating that the model structure is justifiable, and the precision of the model can satisfy the purpose of water resources management.

关键词： distributed hydrological model, structure and equation, gis and RS, Jinghe Basin, Yellow River Basin.