检索结果-内蒙古大学图书馆

A Multi-Baseline PolInSAR Forest Height Inversion Method Taking into Account the Model Ill-posed Problem

Journal of Geodesy and Geoinformation science 2024年第3期7卷 42-56页

作者： LIN Dongfang ZHU Jianjun LI Zhiwei FU Haiqiang LIANG Ji ZHOU Fangbin ZHANG Bing Hunan Provincial Key Laboratory of Geo-Information Engineering in Surveying Mapping and Remote SensingHunan University of Science and TechnologyXiangtan 411201China School of Geosciences and Info-Physics Central South UniversityChangsha 410083China Hunan International Scientific and Technological Innovation Cooperation Base of Advanced Construction and Maintenance Technology of Highway Changsha University of Science&TechnologyChangsha 410114China School of Geomatics Liaoning Technical UniversityFuxin 123000China

Affected by the insufficient information of single baseline observation data,the three-stage method assumes the Ground-to-Volume Ratio(GVR)to be zero so as to invert the vegetation ***,this assumption introduces much biases into the parameter estimates which greatly limits the accuracy of the vegetation height ***-baseline observation can provide redundant information and is helpful for the inversion of ***,the similar model parameter values in a multi-baseline model often lead to ill-posed problems and reduce the inversion accuracy of conventional *** this end,we propose a new step-by-step inversion method applied to the multi-baseline ***,an adjustment inversion model is constructed by using multi-baseline volume scattering dominant polarization data,and the regularized estimates of model parameters are obtained by regularization ***,the reliable estimates of GVR are determined by the MSE(mean square error)analysis of each regularized parameter ***,the estimated GVR is used to extracts the pure volume coherence,and then the vegetation height parameter is inverted from the pure volume coherence by least squares *** experimental results show that the new method can improve the vegetation height inversion result *** inversion accuracy is improved by 26%with respect to the three-stage method and the conventional solution of *** of these have demonstrated the feasibility and effectiveness of the new method.

关键词： multi-baseline vegetation height GVR PolInSAR ill-posed problem

来源：评论

学校读者我要写书评

暂无评论

Evolution of supraglacial lakes over the pan-Antarctic ice sheet between 2014 and 2022: Assessment and the control factors

引用

Advances in Climate Change Research 2025年第2期16卷 337-349页

作者： Shen, Xiao-Yi Ke, Chang-Qing Li, Hai-Li Cai, Yu Xiao, Yao Li, Meng-Meng School of Earth Sciences and Engineering Hohai University Nanjing 211100 China Jiangsu Provincial Key Laboratory of Geographic Information Science and Technology Key Laboratory for Land Satellite Remote Sensing Applications of Ministry of Natural Resources School of Geography and Ocean Science Nanjing University Nanjing 210023 China School of Mathematics and Statistics Zhengzhou University Zhengzhou 450001 China

Widespread supraglacial lakes (SGLs) across the Antarctic surface can accelerate land ice flow and be linked to ice shelf disintegration, further affecting sea-level rise projections. However, previous studies usually focused on SGLs at regional scale or some typical ice shelves, and underestimated the distribution and area of SGLs. Thus, the current Antarctic-wide SGL distribution and variability information is still limited, and the present status and possible influence on ice shelf stability are also largely unknown. Here, we used more than 110,000 Landsat 8 images to detect SGLs across Antarctica (north of 83°S) in austral summer from 2014 to 2022 by using a well-constructed threshold-based method. Overall, most SGLs were located on ice shelves, covering 79% of the total area;the largest SGL areas were found in East Antarctica (79%, 2222 km²), far exceeding the SGL areas in Antarctic Peninsula (20%, 473 km²) and West Antarctica (1%, 23 km²). SGL area gains and declines were found in the Antarctic Peninsula and West Antarctica, respectively, while East Antarctica experienced relatively high interannual variabilities due to the presence of some ice shelves with asynchronous variation patterns. Larger collapse risks are found for smaller ice shelves;ice shelves in East Antarctica are relatively unstable, and disintegration risk is increasing for some ice shelves in Antarctic Peninsula. Glaciological factors are closely related to the location of SGLs, and temperature, precipitation and winds are strongly linked to SGL evolution. This study is expected to enhance the reliability of existing Antarctic SGL dataset by providing a more comprehensive dataset, and offer detailed insights into the relationship between SGLs, climatic factors, and near-surface conditions. Additionally, it examines the risks of ice shelf collapse caused by SGLs, which is essential for understanding the SGL dynamics and their impacts. © 2025 The Authors

关键词： Antarctica Ice shelf collapse risk Spatio-temporal variation Supraglacial lakes

来源：评论

学校读者我要写书评

暂无评论

Inequalities in urban thermal and greenspace exposures:A case study for China’s Greater Bay Area from 2010 to 2020

引用

Building Simulation 2024年第11期17卷 1933-1949页

作者： Xue Zhong Lihua Zhao Peng Ren Yuanjian Teng Xiang Zhang State Key Laboratory of Subtropical Building and Urban Science Department of ArchitectureSouth China University of TechnologyGuangzhou510640China Institute of Remote Sensing and Geographic Information System School of Earth and Space SciencesPeking UniversityBeijing100871China Chair for Strategic Landscape Planning and Management School of Life Sciences WeihenstephanTechnical University of MunichEmil-Ramann-Str.685354FreisingGermany

The interaction between humans and their environment significantly impacts the health of urban ***,there is limited research on assessing the spatiotemporal variations of human thermal exposure as well as inequalities and their relationships with greenspace based on remote sensing data,especially in developing *** study offers a framework utilizing pixel-wise data on land surface coolness index(LSCI),normalized difference vegetation index(NDVI),and population metrics to evaluate population-weighted thermal and greenspace exposures in China’s Greater Bay Area(GBA)over eleven years(2010–2020).It further examines thermal exposure inequality using the Gini index and explores both natural and socio-economical drivers of thermal exposure and its *** results indicate an increasing trend of cities within the GBA being experiencing detrimental thermal *** the study period,the proportion of cities with high exposure to LSCI and NDVI exhibited a general *** 63.6%of major cities observed growing imbalances in LSCI and NDVI exposures over eleven ***,there were positive correlations between NDVI exposure and LSCI exposure,along with their associated ***,coastal cities characterized by lower elevations,higher precipitation rates,and rapid economic growth experienced higher levels of LSCI and NDVI exposures yet these cities also demonstrated greater disparities.

关键词： exposure inequality land surface coolness index(LSCI) normalized difference vegetation index(NDVI) spatiotemporal variation Greater Bay Area(GBA)

来源：评论

学校读者我要写书评

暂无评论

Moving Target Detection Based on a Reduced-dimensional Model in FDA-MIMO Radar

Moving Target Detection Based on a Reduced-dimensional Model...

引用

IET International Radar Conference 2023, IRC 2023

作者： He, Changshan Huang, Bang Xu, Mingming Li, Xiaorui Lu, Xiang Zhang, Running School of Information and Electronics Beijing Institute of Technology Beijing China Institute of Remote Sensing Satellite China Academy of Space Technology Beijing China School of Information and Communication Engineering University of Electronic Science and Technology of China Chengdu China

ISBN: (纸本)9781839539954

In this paper, we study the problem of moving target detection for frequency diverse array multiple-input multiple-output (FDA-MIMO) radar in a Gaussian noise environment with an insufficient training data set. To address this issue, we adopt a reduced-dimensional method for constructing a novel data model to decrease the amount of training data required. Then, based on the new model, two detectors are proposed according to the generalized likelihood ratio test (GLRT) criterion, both one-step and two-step. Simulation results demonstrate that the proposed detectors achieve good detection performance in the case of limited training data, validating the effectiveness of the proposed approach. © The Institution of Engineering & technology 2023.

关键词： Radar target recognition

来源：评论

学校读者我要写书评

暂无评论

Vortex Electromagnetic Wave Three-Dimensional Imaging Based on OMP

Vortex Electromagnetic Wave Three-Dimensional Imaging Based ...

引用

IEEE International Conference on Computational Electromagnetics (ICCEM)

作者： Peng Wen Zi He Dazhi Ding Xinrui Jiang Ying Zhou Nanjing University of Science and Technology Nanjing China Beijing Institute of Remote Sensing Equipment Beijing China

ISBN: (数字)9798350383317

ISBN: (纸本)9798350383324

The phase wavefront of vortex electromagnetic wave contains abundant information, which can be applied to realize the distance and azimuth imaging of targets. However, two-dimensional imaging can only provide the projected information of the target on a plane and cannot accurately reflect the vertical position and shape of the targets. Besides, due to the electromagnetic vortex radar does not have the resolution of elevation, so it is necessary to explore the three-dimensional imaging algorithm. In this paper, a 3D-object imaging algorithm based on orthogonal matching pursuit (OMP) is proposed. Firstly, the staring imaging scenario and the 3-D echo model are established. Second, the three-dimensional targets imaging is obtained based on the OMP algorithm. Finally, the practicability of the theoretical analysis is verified by the simulation result.

关键词： Solid modeling Simulation Electromagnetic scattering Matching pursuit algorithms Imaging Radar imaging Sparse matrices

来源：评论

学校读者我要写书评

暂无评论

Multimodal Electromagnetic Vortex SAR Image Fusion using CNN

Multimodal Electromagnetic Vortex SAR Image Fusion using CNN

引用

IEEE MTT-S International Microwave Workshop Series on Advanced Materials and Processes for RF and THz Applications (IMWS-AMP)

作者： Kun Lan Xiyuan Sun Zi He Da-Zhi Ding Xinrui Jiang Bixia Yang Nanjing University of Science and Technology Nanjing China Beijing Institute of Remote Sensing Equipment Beijing China

ISBN: (数字)9798331520717

ISBN: (纸本)9798331520724

Due to the hollow characteristics of vortex electromagnetic beams, target information may be missing to varying degrees in electromagnetic vortex SAR images under different modes. The target information can be restored using image fusion methods. Traditional pixel-level fusion methods require precise setting of weights, which may result in loss of information from the source image. This paper proposes a Multimodal Electromagnetic Vortex SAR Image Fusion using CNN. First, training is conducted using a large-scale RGB-D dataset (NYU-D2), and then fusion tests are performed using electromagnetic vortex SAR images of different modalities. The comparative experimental results show that this method can integrate electromagnetic vortex SAR images of different modes and recover target information, thereby producing high-quality SAR images.

关键词： Training Radio frequency Target recognition Feature extraction Visual effects Microwave theory and techniques Radar polarimetry Electromagnetics Image reconstruction Microwave imaging

来源：评论

学校读者我要写书评

暂无评论

Characteristics of Musta Glacier surges and their responses to climate change between 1976 and 2023

引用

Advances in Climate Change Research 2025年第1期16卷 125-140页

作者： Yong-Peng GAO Shi-Yin LIU Jin-Liang WANG Xiao-Jun YAO Miao-Miao QI Peng-Bin LIANG Jian-Xin MU Xing-Gang MA Yu ZHU Fu-Ming XIE Zong-Li JIANG Zhen ZHANG Yunnan Normal University Kunming 650500China Institute of International Rivers and Eco-Security Yunnan UniversityKunming 650091China Key Laboratory of Resources and Environmental Remote Sensing for Universities in Yunnan Kunming 650500China Key Laboratory of Resource Environment and Sustainable Development of Oasis Northwest Normal UniversityGansu ProvinceLanzhou 730070China School of Ecology and Environmental Science Qinghai University of Science and TechnologyXining 810008China Key Laboratory of Cryospheric Science and Frozen Soil Engineering/Tian Shan Glaciological Station Northwest Institute of Eco-Environment and ResourcesChinese Academy of SciencesLanzhou 730000GansuChina National Field Science Observation and Research Station of Yulong Snow Mountain Cryosphere and Sustainable Development Northwest Institute of EcoEnvironment and ResourcesChinese Academy of SciencesLanzhou 730000China School of Earth Sciences and Spatial Information Engineering Hunan University of Science and TechnologyXiangtan 411201China School of Geomatics Anhui University of Science and TechnologyHuainan 232001China

Understanding the differential responses of various tributaries of the same glacier to climate change under similar climatic conditions in the Karakoram is crucial for unraveling the complexity of glacier dynamics in this *** study systematically examines the surface elevation,flow velocity,morphological changes,and climate responses for different tributary glaciers of the Musta Glacier,using multi-source remote sensing imagery and meteorological reanalysis data from 1976 to *** findings reveal that the tributaries of Musta Glacier experienced a total of nine surges,with an average duration exceeding ten *** surges typically began in spring and summer and concluded in summer and *** these events,the glaciers transferred an estimated 1.32 km^(3)of material downstream,resulting in an average thickening of over 30 m in the receiving *** analysis of velocities reveals that the acceleration phase of Musta Glacier tributary surges ranges from 1 to 12 years,with an average duration exceeding 6 years,while the deceleration phase consistently lasts less than 4 *** the tributaries,the South Chongtar Glacier exhibits the most rapid surge dynamics,with a total surge duration of just 5 ***,all surging tributaries of Musta Glacier induce notable geomorphic changes during their surge events,including the formation of ring-shaped moraines and terminal *** analysis with previous studies reveals that the surge characteristics of most Musta Glacier tributaries resemble those of thermally controlled Svalbard-type surging ***,we observed that the surging patterns of Musta Glacier are closely linked to regional climatic variations,characterized by increased precipitation and noticeably cooling prior to surge *** the other hand,we proposed that the asynchronous surging behavior among the tributaries of Musta Glacier is primarily driven by variations in the internal dynamic processes of e

关键词： Glacier surge Climate change Musta Glacier Karakoram remote sensing

来源：评论

学校读者我要写书评

暂无评论

Prospects on mangrove knowledge services in the smart era:From plant atlas to knowledge graphs

引用

science China Earth sciences 2025年第1期68卷 111-127页

作者： Zhi-Wei HOU Wenlong JING Cheng-Zhi QIN Ji YANG Qing XIA Xiaoling YIN Key Laboratory of Guangdong for Utilization of Remote Sensing and Geographical Information System Guangdong Open Laboratory of Geospatial Information Technology and ApplicationGuangzhou Institute of GeographyGuangdong Academy of SciencesGuangzhou510070China Southern Marine Science and Engineering Guangdong Laboratory(Guangzhou) Guangzhou511458China State Key Laboratory of Resources and Environmental Information System Institute of Geographic Sciences and Natural Resources ResearchChinese Academy of SciencesBeijing100101China College of Resources and Environment University of Chinese Academy of SciencesBeijing100049China School of Traffic&Transportation Engineering Changsha University of Science and TechnologyChangsha410114China

Mangroves are crucial to the ecological security of the Earth and human *** management,conservation,and restoration are of great importance and necessitate the support of spatio-temporal information and multidisciplinary knowledge such as biology and *** knowledge services such as plant atlas provide illustrated textual knowledge of ***,this kind of service is oriented to information retrieval and is incapable of effectively mining and utilizing fragmented knowledge from multi-source heterogeneous data,facing the problem of“massive data,rare knowledge”.Knowledge graphs are capable of extracting,organizing,and fusing the knowledge contained in massive data into semantic networks that can be understood and computed by *** provide a solution for the realization of intelligent knowledge *** on the urgent need for mangrove knowledge acquisition,formal representation,and intelligent services,this paper proposes a research prospect on mangrove knowledge graphs and knowledge *** first analyze the similarities and differences between various domain-specific concepts of *** this basis,we define the mangrove knowledge graph as a large-scale knowledge base that integrates multi-disciplinary knowledge and spatio-temporal information with mangrove ecosystems as the ***,we propose a research framework for mangrove knowledge services that can realize the transformation from multi-modal data to intelligent knowledge services,including multiple research levels such as ubiquitous data sensing and aggregation,knowledge organization and graph construction,and intelligent mangrove knowledge ***,the methods and workflow for constructing mangrove knowledge graphs are ***,we discuss the challenges and possible future directions of mangrove knowledge services in the smart era,including the construction of a mangrove knowledge system that integrates the domain-specific charac

关键词： Mangrove Tupu Knowledge graph Multi-modal Knowledge service

来源：评论

学校读者我要写书评

暂无评论

Data-Driven Real-Time Scheduling for Reconfigurable Workshop Using End-to-End Deep Reinforcement Learning

Data-Driven Real-Time Scheduling for Reconfigurable Workshop...

引用

Automation in Manufacturing, Transportation and Logistics (ICaMaL), International Conference on

作者： Yuxin Li Xinyu Li Liang Gao Zhibing Lu Yan Qin School of Mechanical Science and Engineering Huazhong University of Science and Technology Wuhan China Beijing Institute of Remote Sensing Equipment Beijing China

ISBN: (数字)9798350378658

ISBN: (纸本)9798350378665

The multi-variety and small-batch production mode has made reconfigurable manufacturing systems a promising manufacturing paradigm. Meanwhile, frequent dynamic events in the workshop require scheduling methods with fast response capability. Therefore, this paper proposed a deep reinforcement learning (DRL) method for dynamic reconfigurable shop scheduling problem to minimize the total weighted tardiness. Specifically, a real-time scheduling framework is proposed firstly. Then, a DRL-based agent training algorithm is developed, where the state spaces with generality, rule weighting based action spaces, and a reward function based on the estimated weighted tardiness are designed for two agents. Moreover, a mechanism is proposed for handling new job arrivals and job reworks. The experimental results on 120 instances show that the proposed method can obtain better solutions than nine high-quality composite rules, and can effectively deal with dynamic events through training and learning.

关键词： Training Job shop scheduling Conferences Transportation Production Dynamic scheduling Deep reinforcement learning Real-time systems Manufacturing systems Logistics

来源：评论

学校读者我要写书评

暂无评论

A review of the BuFeng-1 GNSS-R mission:calibration and validation results of sea surface and land surface

引用

地球空间信息科学学报（英文版） 2024年第3期27卷 638-652页

作者： Cheng Jing Weiqiang Li Wei Wan Feng Lu Xinliang Niu Xiuwan Chen Antonio Rius Estel Cardellach Semi Ribó Baojian Liu Zhizhou Guo Yang Nan National Key Laboratory of Science and Technology on Space Microwave China Academy of Space Technology(Xi'an)Xi'anChina Xi'an Institute of Space Radio Technology China Academy of Space Technology(Xi'an)Xi'anChina Institute of Space Sciences Spanish National Research Council(ICECSIC)Cerdanyola del VallèsSpain Department of Earth Observation Institut d'Estudis Espacials de CatalunyaBarcelonaSpain The Institute of Remote Sensing and Geographic Information System(IRSGIS) Peking UniversityBeijingChina The National Satellite Meteorological Center(NSMC) China Meteorological Administration(CMA)BeijingChina School of Soil and Water Conservation Beijing Forestry UniversityBeijingChina School of Marine Science and Technology Tianjin UniversityTianjinChina

In this paper,we will conclude the results of Bufeng-1(BF-1)A/B data processing,calibration workflow,and validation of the calibrated sea surface winds,land surface soil moisture,and sea surface height *** 2019,the BF-1 mission has operated in-orbit for over 4 *** Earth reflected delay Doppler maps(DDMs)are continuously collected to perform global sea surface and land *** the same time,the intermediate frequency(IF)raw data are also obtained for 12 seconds every pass in diagnostic *** begin with,a brief description of the spaceborne Global Navigation Satellite System Reflectometry(GNSS-R)technique will be provided in the ***,we will present the overview of Chinese BF-1 mission and the data specifications used in our *** the next section,the BF-1 mission-related spaceborne power calibration and validation are presented to show the sup-port to power DDM observable production for sea surface and land surface ***,the status of Chinese Beidou System(BDS)Equivalent Isotropic Radiated Power(EIRP)acquisi-tion programme is then ***,the latest sea surface height(SSH)measure-ments results including two modes(group delay and carrier phase)and wind speed derivation based on machine learning(ML)method will be spatial-temporal aligned and validated with auxiliary datasets including Denmark technology University(DTU)mean sea surface(MSS)products and European Centre for Medium-Range Weather Forecasts(ECMWF)ERA5 *** previous published results of sea surface winds retrieval under Hurricane conditions and soil moisture retrieval are also reviewed for the BF-1 mission ***,the conclu-sion of BF-1 derived results will be discussed to draw out ongoing/future works.

关键词： Global Navigation Satellite System-Reflectometry(GNSS-R) Delay-Doppler Map(DDM) sea surface height(SSH) soil moisture sea surface wind speed Bufeng-1 Immediate Frequency(IF)

来源：评论

学校读者我要写书评

暂无评论

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

请选择保存的检索档案：

请选择收藏分类：

通借通还

建议与咨询 留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

请选择保存的检索档案： 新增检索档案 确定 取消

请选择收藏分类： 新增自定义分类 确定 取消

通借通还

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

请选择保存的检索档案：

请选择收藏分类：