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A multi-scale and multi-orientation image retrieval method based on rotation-invariant texture features

Science china(Information Sciences) 2011年第4期54卷 732-744页

作者： shao zhenfeng,li {2. & zhu xianqiang state key laboratory for Information Engineering in surveying,mapping and remote sensing,wuhan university,12. luoyu road,{12.,{12. 1. state key {2. for Information Engineering in surveying Mapping and Remote Sensing Wuhan University 129 Luoyu Road Wuhan 430079 China

Texture retrieval is a vital branch of content-based image ***-invariant texture retrieval plays a key role in texture *** paper addresses three major issues in rotation-invariant texture retrieval: how to select the texture measurement methods,how to alleviate the influence of rotation for texture retrieval and how to apply the proper multi-scale analysis theory for texture ***,the spectrum influence between a Radon transform and a Log-polar transform was compared after the rotation effect was *** average retrieval performance of wavelet and NSCT with different retrieval parameters was also *** on such analysis,we developed a multi-scale and multi-orientation texture transform spectrum,as well as a rotation-invariant feature vector and its measurement criteria,which can represent the human visual perception sensitive to texture *** a new rotation-invariant texture retrieval algorithm was *** algorithm was developed based on non-parametric statistical features and it applies low band and high frequency directional bands of NSCT coefficients for coarse filtering and fine retrieval,*** on the Brodatz image database show that the constructed rotation-invariant feature vector is appropriate for capturing major orientations and describing detail ***,the combination of the two-step progressive retrieval strategy and multi-scale analysis method can effectively improve retrieval efficiency while ensuring a high precision compared with traditional algorithms.

关键词： NSCT Log-polar Radon rotation-invariant texture retrieval

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Processing Approach of Non-linear Adjustment Models in the Space of Non-linear Models

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Geo-Spatial Information Science 2003年第2期6卷 25-30页

作者： li Chaokui zhu Qing SONG Chengfangli Chaokui,associate professor,Ph.D,state key laboratory of Information Engineering in surveying,mapping and remote sensing,wuhan university,12. luoyu road,wuhan 430079,china. state key {2. of Information Engineering in surveying Mapping and Remote Sensing Wuhan University

This paper investigates the mathematic features of non-linear models and discusses the processing way of non-linear factors which contributes to the non-linearity of a non-linear model. On the basis of the error definition,this paper puts forward a new adjustment criterion, ***,this paper investigates the solution of a non-linear regression model in the non-linear model space and makes the comparison between the estimated values in non-linear model space and those in linear model space.

关键词： non-linear adjustment model model space multi-robustness

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Changes in albedo and its radiative forcing of grasslands in East Asia drylands

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Ecological Processes 2024年第1期13卷 237-251页

作者： Qingsong zhu Jiquan Chen liangxu Wu Yuting Huang Changliang shao Gang Dong Zhe Xu Xianglan li state key {2. of remote sensing Science College of Global Change and Earth System Science Faculty of Geographical ScienceBeijing Normal University Department of Geography Environment and Spatial Sciences Michigan State University state key {2. of Efficient Utilization of Arid and Semi-Arid Arable Land in Northern china National Hulunber Grassland Ecosystem Observation and Research Station Institute of Agricultural Resources and Regional Planning Chinese Academy of Agricultural Sciences School of life Science Shanxi University

Background Grasslands in drylands are increasingly influenced by human activities and climate change, leading to alterations in albedo and radiative energy balance among others. Surface biophysical properties and their interactions change greatly following disturbances. However, our understanding of these processes and their climatic impacts remains limited. In this study, we used multi-year observations from satellites and eddy-covariance towers to investigate the response of albedo to variables closely associated with human disturbances, including vegetation greenness（EVI） and surface soil volumetric water content（VWC）, as well as snow cover and clearness index（Ta） for their potential *** EVI and VWC during the growing season were the primary factors influencing albedo. EVI and VWC were negatively correlated with albedo, with VWC's total direct and indirect impacts being slightly smaller than those of EVI. During the non-growing season, snow cover was the most influential factor on albedo. VWC and Ta negatively affected albedo throughout the year. We estimated the impact of variations in EVI and VWC on climate to be in the range of 0.004 to 0.113 kg CO2.-2.r-1in *** This study indicates the significant impacts of climate change and human disturbances on vulnerable grassland ecosystems from the perspective of altered albedo. Changes in vegetation greenness and soil properties induced by climate change and human activities may have a substantial impact on albedo, which in turn feedback on climate change, indicating that future climate policies should take this factor into consideration.

关键词： Albedo Global warming potential Grassland Disturbance

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Using soil surface gray level to determine surface soil water content

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Science china Earth Sciences 2010年第10期53卷 1527-1532页

作者： zhu YuanJun1,2.WANG YunQiang1,2.& shao MingAn1,2.1 {2. key laboratory of Soil Erosion and Dryland Farming on Loess Plateau,Institute of Soil and Water Conservation,Northwest A & F university,Yangling 712.00,china 2.Institute of Soil and Water Conservation,Chinese Academy of Sciences & Ministry of Water Resources,Yangling 712.00,china 1. state key {2. of Soil Erosion and Dryland Farming on Loess Plateau Institute of Soil and Water Conservation Northwest A & F University Yangling 712100 China2. Institute of Soil and Water Conservation Chinese Academy of Sciences & Ministry of Water Resources Yangling 712100 China

How to determine surface soil water content(SWC) quickly and accurately is fundamental in studying eco-hydrological processes and their *** we use laboratory experiments to determine surface SWC using soil surface gray level(SGL) values.A negatively exponential relationship exists between SGL and SWC,i.e.,SGL increases with the decrease of *** can be estimated based on initial SGL value(surface gray level when SWC=0),SWC,and a surface roughness coefficient characterized by mean soil particle *** variation range of SGL was larger than that of SWC,indicating that changes in SWC were enhanced in SGL,and that SGL would thus be sensitive to changes in soil *** the 95% confidence level,SWC can be determined by using the relationship between SWC and SGL established by the *** determination of SWC has a high precision when SWC was between dry and saturated.

关键词： Loess Plateau soil water remote sensing surface roughness

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Calibration of digital camera integration accuracy for low-cost oblique aerial photogrammetry

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Geo-Spatial Information Science 2015年第2期18卷 90-96页

作者： likun liU {2. shao china Ship Development and Design Center 268 Zhangzhidong RoadWuhan 430064China state key {2. of Information Engineering in surveying Mapping and Remote SensingWuhan University129 Luoyu RoadWuhan 430079China Collaborative Innovation Center for Geospatial Technology 129 Luoyu RoadWuhan 430079China

This work describes a calibration process for inexpensive consumer cameras integrated into a low cost and compact aerial multi-view imager for remote {2. and *** main advantage of this design is to make the filming component lightweight and rapidly deployable,as well as reducing cost when compared with mainstream commercial oblique *** in situ flight test was carried out in *** that experiment,a meridian convergence-based approach was adopted to adjust preprocessing,the residue error and the captured images’exterior orientation linear and angular parameters were calculated by means of the direct geo-referencing approach yielding a favorable outcome for exterior orientation linear parameters of the camera,around 0.2.0.3 m deviation from the actual measured results at 1000 m flight above ground *** camera’s exterior orientation angular parametersφ,ωwhose difference compared with the standard aerial aero triangulation approach reached a high accuracy level within the intended endurance of 0.005°.These results indicate that the compact implementation of the oblique aerial imager comprised of consumer level off-the-shelf digital cameras achieved competitive accuracy at a low cost and high versatility.

关键词： oblique photogrammetry aerial imager calibration digital camera position and orientation

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High-resolution reconstruction of April-September precipitation and major extreme droughts in china over the past∼530 years

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Science Bulletin 2024年第17期69卷 2756-2764页

作者： Yongxiang Zhang Hongli Wang Xuemei shao Hongbin liu Haifeng zhu lily Wang Eryuan liang Zhixin Hao Xiuqi Fang Qibin Zhang Jinjian li Xinghe Shi Yujiang Yuan Feng Chen Tongwen Zhang Ruibo Zhang Huaming Shang Jianfeng Peng National Climate Centre China Meteorological AdministrationBeijing 100081China key laboratory of Land Surface Pattern and Simulation Institute of Geographic Sciences and Natural Resources ResearchChinese Academy of SciencesBeijing 100101China Beijing New Epoch School the Administrative Bureau of Chinese Academy of SciencesBeijing 100086China university of Chinese Academy of Sciences Beijing 100049China key laboratory of Alpine Ecology Institute of Tibetan Plateau ResearchChinese Academy of SciencesBeijing 100101China CAS Center for Excellence in Tibetan Plateau Earth Sciences Beijing 100101China Faculty of Geographical Science Beijing Normal UniversityBeijing 100875China state key {2. of Vegetation and Environmental Change Institute of BotanyChinese Academy of SciencesBeijing 100093China School of Atmospheric Sciences Plateau Atmosphere and Environment Key Laboratory of Sichuan ProvinceChengdu University of Information TechnologyChengdu 610225China Qinghai Climate Centre Xining 810001 China key laboratory of Tree-Ring Physical and Chemical Research of {2. Meteorological Administration Key Laboratory of Tree-Ring Ecology of Xinjiang Uygur Autonomous RegionInstitute of Desert MeteorologyChina Meteorological AdministrationUrumqi 830002China Yunnan key laboratory of International Rivers and Transboundary Eco-Security Institute of International Rivers and Eco-SecurityYunnan UniversityKunming 650000China College of Geography and Environmental Science Henan UniversityKaifeng 475004China

Extreme drought events have increased,causing serious losses and damage to the social economy under current warming ***,short-term meteorological data limit our understanding and projection of these *** the accumulation of proxy data,especially tree-ring data,large-scale precipitation field reconstruction has provided opportunities to explore underlying mechanisms *** point-by-point regression,we reconstructed the April-September precipitation field in china for the past~530 years on the basis of 590 proxy records,including 470 tree-ring width chronologies and {2. drought/flood *** regression models explained average 50%of the variance in *** the statistical test on calibration and verification,our models passed the significance level that assured reconstruction *** reconstruction data performed well,showing consistency and better quality than previously reported *** first three leading modes of variability in the reconstruction revealed the main distribution modes of precipitation over ***/drought and extremely wet/drought years accounted for {2.81%/10.92.(68 years/58 years)and 1.69%/3.2.%(9 years/17 years)of the past~530 years in china,*** extreme drought events can be identified explicitly in our *** detailed features of the Chongzhen Great Drought(1637-1643),the Wanli Great Drought(1585-1590),and the Ding-Wu Great Famine(1874-1879),indicated the existence of potentially different underlying mechanisms that need further *** further improvements can be made for remote uninhabited areas and large deserts,our gridded reconstruction of April-September precipitation in china over the past~530 years can provide a solid database for studies on the attribution of climate change and the mechanism of extreme drought events.

关键词： Precipitation reconstruction Tree rings Historical documents Precipitation variability Extreme droughts

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基于时空位置大数据的公共疫情防控服务让城市更智慧

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武汉大学学报（信息科学版） 2020年第4期45卷 475-487,556页

作者：李德仁邵振峰于文博朱欣焰周素红武汉大学测绘遥感信息工程国家重点实验室湖北武汉430079 武汉大学遥感信息工程学院湖北武汉430079 中山大学地理科学与规划学院广东广州510275 广东省公共安全与灾害工程技术研究中心广东广州510275

智慧城市离不开时空位置大数据服务。总结国内外公共疫情防控事件对时空位置大数据的要求,调研其在当前疫情防控中提供的具体服务情况,讨论还有哪些方面无法满足公共疫情防控需求之处,重点分析下一步应该如何完善时空位置大数据服务,以... 详细信息

智慧城市离不开时空位置大数据服务。总结国内外公共疫情防控事件对时空位置大数据的要求,调研其在当前疫情防控中提供的具体服务情况,讨论还有哪些方面无法满足公共疫情防控需求之处,重点分析下一步应该如何完善时空位置大数据服务,以更好地服务于公共疫情防控,并分别从平时时空大数据位置服务的建设内容和战时数据共享机制等多方面给出建议。该文旨在采取科学手段完善时空大数据服务,力争在平时为公共疫情防控建立好技术支撑系统,并出台"战时"面向疫情防控需求的数据共享机制。

关键词：时空位置大数据公共疫情防控智慧城市位置服务

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基于多源高分辨率遥感影像的2.m不透水面一张图提取

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武汉大学学报（信息科学版） 2018年第12期43卷 1909-1915页

作者：邵振峰张源黄昕朱秀丽吴亮万波武汉大学测绘遥感信息工程国家重点实验室湖北武汉430079 武汉大学遥感信息工程学院湖北武汉430079 国家基础地理信息中心北京100830 中国地质大学(武汉)信息工程学院湖北武汉430074

不透水率是衡量城市生态环境状况的一个重要指标。当前全球范围内仅有1km和30m分辨率尺度的不透水面专题信息,无法满足城市尺度水文模型建模、海绵城市规划和建设需求。提出了图谱信息融合的不透水面提取模型,实现了基于深度学习的不透... 详细信息

不透水率是衡量城市生态环境状况的一个重要指标。当前全球范围内仅有1km和30m分辨率尺度的不透水面专题信息,无法满足城市尺度水文模型建模、海绵城市规划和建设需求。提出了图谱信息融合的不透水面提取模型,实现了基于深度学习的不透水面提取新方法,研制了不透水面遥感全流程提取和监测软件。基于多源高分辨率遥感影像首次完成了中国31个省(直辖市、自治区)的2.不透水面专题信息提取,形成全国不透水面一张图,为海绵城市和生态城市的建设提供了基础数据支撑和技术监测手段。

关键词：地表覆盖产品不透水面提取模型深度学习高分辨率遥感影像

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GeoScope:Full 3D Geospatial Information System Case Study

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Geo-Spatial Information Science 2011年第2期14卷 150-156页

作者： ZHANG Yeting zhu Qing liU Gang ZHENG Wenting li Zhonghua DU Zhiqiang state key {2. of Information Engineering in surveying Mapping and Remote Sensing Wuhan University 129 Luoyu Road Wuhan 430079 China china university of Geosciences ({2.) 388 Lumo Road Wuhan 430074 China state key {2. of CAD&CG Zhejiang University 100 Zijinggang Road Hangzhou 310058 China wuhan Land Resources and Planning Information Center 13 Sanyang Road Wuhan 430014 China

Aiming at the integrative management and comprehensive applications of large-scale 3D geospatial information covering the full 3D space of a city, this paper briefly introduces the design and implementation of a full 3D GIS platform： GeoScope, which provides a professional solution for the massive full three-dimensional geospatial data integration, management, analysis, visualization, and applications. GeoScope is characterized by：（1） extendible software architecture based on the hierarchical message bus, facilitates multimodal integrative applications of 2. GIS and 3D GIS; （2. unified 3D city models, support multiscale se- mantic representation of outdoor ＆ indoor and aboveground ＆ underground 3D objects; （3） high-efficient 3D geospatial database engine, supports integrated management of massive 3D geospatial data for real-time applications; and （4） high-performance visualization engine exploiting the massively parallel computation architecture of modem GPUs, supports real-time realistic rendering of large-scale complicated 3D geospatial environments. The successful pilot application of GeoScope is also illustrated with the 3D city models of 8494 knl2.of the whole wuhan City, the largest city in middle china.

关键词： 3D geospatial information system 3D city models database engine visual analysis levels of detail semantic relationship

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Photogrammetry Education for Multidisciplinary Geomatics in china

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Geo-Spatial Information Science 2006年第4期9卷 273-280,305页

作者： zhu Qing state key {2. for Information Engineering in surveying Mapping and Remote Sensing Wuhan University 129 Luoyu Road Wuhan 430079 China

After briefly reviews the history of photogrammetry education in china, the development of undergraduate and graduate program, and the corresponding curricula design are analyzed by use of the data from wuhan university in which the photogrammetry is awarded as the {2.-level key discipline. The academic educational program of photogrammetry in universities has trained students to perform tasks in all fields of the photogrammetric profession. In recent years, the nature of photogrammetry is changing and multidisciplinary geomatics are developing very rapidly, the educational program of photogrammetry has also changed in new concepts and structures to adapt very new technologies and the extension of the field. Finally, the prospect of photogrammetry education for the requirements of multidiseiplinary geomatics is proposed. The growing interest in fast and accurate 3D spatial data collection （such as city modeling and digital earth） results in the increasing need of photogrammetry as principal tool, photogrammetric courses are therefore requested to be upto date and to become one kind of the fundamental professional courses for university geomatics and remote sensing degree programs.

关键词： photogrammetry education remote sensing geomatics china

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