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Technical progress of China’s national remote sensing mapping:from mapping western China to national dynamic mapping

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Geo-Spatial Information Science 2021年第1期24卷 121-133,I0013页

作者： jixian zhang Haiyan Gu Wei Hou Chunquan Cheng National Quality Inspection and Testing Center for Surveying and Mapping Products State BeijingChina Chinese Academy of Surveying and Mapping BeijingChina

Remote sensing mapping is an important research direction in the development of geographic surveying and *** order to successfully implement the project of Mapping Western China(MWC),a technical mapping system has been *** this project,many problems have been solved through technological innovation,such as block adjustment with scarce control points,large-scale aerial/satellite image mapping,and intelligent interpretation of multi-source *** softwares were developed,*** for aerial/satellite image mapping in a large area,FeatureStation for the integration of multi-source data in the complex terrain areas,and an airborne multi-band and multi-polarization interferometric data acquisition system for SAR *** the first time,full coverage of 1:50,000 topographic data of China’s land territory has been produced,which means the geospatial framework of digital China is basically *** the implementation of other key national plans and projects(*** geographic conditions monitoring and national remote sensing mapping),the focus has changed from MWC to national dynamic ***,a dynamic mapping system is *** data acquisition capability has developed from a single source to multiple sources and multiple *** mapping capability has developed into dynamic mapping,and the capability for database update shows the characteristics of *** national geographic condition monitoring creates a multi-scale index system for statistical analysis for various needs.A multi-level and multi-dimensional technical system for statistical computing and decision-making service is developed for the transformation from dynamic monitoring to information *** this paper,we give a brief introduction about the recent development of remote sensing mapping in China with respect to data acquisition,map production,and information *** purpose of this paper is to motivate the establishment

关键词： Remote sensing mapping mapping western China national dynamic monitoring data acquisition image interpretation information service

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Fusion of SAR and Optical Image for Sea Ice Extraction

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Journal of Ocean University of China 2021年第6期20卷 1440-1450页

作者： LI Wanwu LIU Lin zhang jixian College of Geodesy and Geomatics Shandong University of Science and TechnologyQingdao 266590China National Quality Inspection and Testing Center for Surveying and Mapping Products Beijing 100830China

It is difficult to balance local details and global distribution using a single source image in marine target detection of a large *** solve this problem,a technique based on the fusion of optical image and synthetic aperture radar(SAR)image for the extraction of sea ice is proposed in this *** Band 2(B2 image of Sentinel-2(S2 in the research area is selected as optical image *** on the optical image,such as resampling,projection transformation and format conversion,are conducted to the S2 dataset before *** characteristics of the sea ice have been analyzed,and a new deep learning(DL)model,OceanTDL5,is built to detect sea *** fusion of the Sentinel-1(S1 and S2 images is realized by solving the optimal pixel values based on deriving Poisson *** experimental results indicate that the use of a fused image improves the accuracy of sea ice detection compared with the use of a single data *** fused image has richer spatial details and a clearer texture compared with the original optical image,and its material sense and color are more abundant.

关键词： sea ice detection image fusion SAR image optical image Poisson Equation

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Understanding geographical conditions monitoring: a perspective from China

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International Journal of Digital Earth 2015年第1期8卷 38-57页

作者： jixian zhang Weisen Li Liang Zhai Chinese Academy of Surveying and Mapping BeijingChina National Administration of Surveying Mapping and Geo-informationBeijingChina

The geographical condition is a very important component of a country’s national condition,and geographical conditions monitoring(GCM)has been of great concern to the Chinese *** has a close relation with‘Digital China’and is a concrete embodiment of Digital *** paper discusses the content and classification of *** accordance with application areas,GCM can be divided into fundamental monitoring,thematic monitoring,and disaster *** application areas perspective includes the content of the three other perspectives,like the monitoring elements,the monitoring scope,and the monitoring cycle and fully reflects the essence of the *** monitoring mainly focuses on monitoring all of the geographical elements,which provides a basis for follow-up thematic monitoring;thematic monitoring is a special type of designated subject monitoring that concerns the public or the government;disaster monitoring focuses on the dynamic monitoring of the pre-disaster and disaster periods for natural *** monitoring results will provide timely information for governments so that they can meet management or decision-making requirements.A GCM case study in the area of the Qinghai−Tibet plateau was made,and some concrete conclusions were ***,this paper presents some thoughts on conducting GCM.

关键词： geographical conditions monitoring fundamental monitoring thematic monitoring disaster monitoring Qinghai−Tibet plateau

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A high-level architecture for a Geomatics Informatization Technology System: the Chinese case

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International Journal of Digital Earth 2011年第2期4卷 93-107页

作者： jixian zhang Weisen Li Liang Zhai Chinese Academy of Surveying and Mapping No.28 Lianhuachixi Rd.Haidian Dist.Beijing 100830China State Bureau of Surveying and Mapping No.28 Lianhuachixi Rd.Haidian Dist.Beijing 100830China

China will,as a component of‘Digital Earth,’establish a Geomatics Informatization Technology System(GITS)which is characterized by real-time acquisition,automatic processing,networking service,and socialized application with fundamental geographical *** basic composition of GITS is *** covers four layers and six *** four layers are data acquisition,processing,management,and application and *** six platforms are informatic geodetic datum,high-precision geo-spatial data acquisition,automatic geo-spatial data processing,grid-based geo-spatial information management,comprehensive geo-spatial information sharing and service,and geo-spatial information integration and *** informatic geodetic datum platform provides a carrier for all the four layers and a base for the other five *** high-precision geo-spatial data acquisition platform belongs to the acquisition *** automatic geo-spatial data processing platform belongs to the processing *** grid-based geo-spatial information management platform belongs to the management layer and is a bridge connecting geospatial data acquisition and spatial information sharing service and integrated *** comprehensive geo-spatial information sharing and service platform belongs to the application and service ***,this paper presents thoughts for constructing GITS.

关键词： Digital Earth geomatics geodetic datum data acquisition and processing information management and service

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Component-adaptive up-sampling for inter layer interpolation in scalable video coding

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Science in China(Series F) 2009年第4期52卷 704-711页

作者： WANG zhang zhang jixian LI HaiTao Institute of Photogrammetry and Remote Sensing Chinese Academy of Surveying and Mapping Beijing 100039 China

Scalable video coding （SVC） is a newly emerging standard to be finalized as an extension of H.264/AVC. The most attractive characters in SVC are the inter layer prediction techniques, such as Intra_BL mode. But in current SVC scheme, a uniform up-sampling filter （UUSF） is employed to magnify all components of an image, which will be very inefficient and result in a lot of redundant computational complexity. To overcome this, we propose an efficient component-adaptive up-sampling filter （CAUSF） for inter layer interpolation. In CAUSF, one character of human vision system is considered, and different up- sampling filters are assigned to different components. In particular, the six-tap FIR filter used in UUSF is kept and assigned for luminance component. But for chrominance components, a new four-tap FIR filter is used. Experimental results show that CAUSF maintains the performances of coded bit-rate and PSNR-Y without any noticeable loss, and provides significant reduction in computational complexity.

关键词： scalable video coding spatial interpolation up-sampling filter human vision system

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Modeling and Sensitivity Analysis of Navigation Parameter Errors for Airborne Synthetic Aperture Radar Stereo Geolocation

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Geo-Spatial Information Science 2010年第3期13卷 166-173页

作者： PANG Lei zhang jixian YAN Qin Chinese Academy of Surveying and Mapping 16 Beitaiping Road Haidian District Beijing 100039 China

For the high-resolution airborne synthetic aperture radar （SAR） stereo geolocation application, the final geolocation ac- curacy is influenced by various error parameter sources. In this paper, an airborne SAR stereo geolocation parameter error model, involving the parameter errors derived from the navigation system on the flight platform, has been put forward. Moreover, a kind of near-direct method for modeling and sensitivity analysis of navigation parameter errors is also given. This method directly uses the ground reference to calculate the covariance matrix relationship between the parameter errors and the eventual geoloeation errors for ground target points. In addition, utilizing true flight track parameters＇ errors, this paper gave a verification of the method and a corresponding sensitivity analysis for airborne SAR stereo geolocation model and proved its efficiency.

关键词： airborne SAR stereo sensitivity analysis parameter error geolocation

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Parallel Extraction of Marine Targets Applying OIDA Architecture

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Journal of Ocean University of China 2022年第3期21卷 737-747页

作者： LIU Lin LI Wanwu zhang jixian SUN Yi CUI Yumeng College of Geodesy and Geomatic Shandong University of Science and TechnologyQingdao266590China National Quality Inspection and Testing Center for Surveying and Mapping Products Beijing100830China

Computing resources are one of the key factors restricting the extraction of marine targets by using deep *** order to increase computing speed and shorten the computing time,parallel distributed architecture is adopted to extract marine *** advantages of two distributed architectures,Parameter Server and Ring-allreduce architecture,are combined to design a parallel distributed architecture suitable for deep learning–Optimal Interleaved Distributed Architecture(OIDA).Three marine target extraction methods including OTD_StErf,OTD_Loglogistic and OTD_Sgmloglog are used to test OIDA,and a total of 18 experiments in 3categories are carried *** results show that OIDA architecture can meet the timeliness requirements of marine target *** average speed of target parallel extraction with single-machine 8-core CPU is 5.75 times faster than that of single-machine single-core CPU,and the average speed with 5-machine 40-core CPU is 20.75 times faster.

关键词： parallel computing distributed architecture deep learning target extraction PolSAR image

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Machine Learning Based Resource Allocation of Cloud Computing in Auction

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Computers, Materials & Continua 2018年第7期56卷 123-135页

作者： jixian zhang Ning Xie Xuejie zhang Kun Yue Weidong Li Deepesh Kumar School of Information Science and Engineering Yunnan UniversityKunming 650504PR China School of Mathematics and Statistics Yunnan UniversityKunming 650504PR China Computer Science&Engineering SSITM AktuLucknow 226014India

Resource allocation in auctions is a challenging problem for cloud ***,the resource allocation problem is NP-hard and cannot be solved in polynomial *** existing studies mainly use approximate algorithms such as PTAS or heuristic algorithms to determine a feasible solution;however,these algorithms have the disadvantages of low computational efficiency or low allocate *** this paper,we use the classification of machine learning to model and analyze the multi-dimensional cloud resource allocation problem and propose two resource allocation prediction algorithms based on linear and logistic *** learning a small-scale training set,the prediction model can guarantee that the social welfare,allocation accuracy,and resource utilization in the feasible solution are very close to those of the optimal allocation *** experimental results show that the proposed scheme has good effect on resource allocation in cloud computing.

关键词： Cloud computing resource allocation machine learning linear regression logistic regression

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Self-assembled structure of cyanine dyes: J-aggregates characteristics on optical information storing microcrystals

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Rare Metals 2006年第z1期25卷 158-162页

作者： JIANG Xiaoli LI Xiaowei LAI Weidong MENG Tao FENG Xiaomin zhang jixian College of Physics Science & Technology Hebei University Baoding 071002 China College of Physics Science & Technology Hebei University Baoding 071002 China College of Physics Science & Technology Hebei University Baoding 071002 China College of Physics Science & Technology Hebei University Baoding 071002 China College of Physics Science & Technology Hebei University Baoding 071002 China College of Physics Science & Technology Hebei University Baoding 071002 China

Dye sensitization is a fundamental function for solar cell and silver halide (AgX) microcrystal to increase the optoelectronic conversion efficiency. In this paper, the spectral properties and self-assembled structure of three types of cyanine dyes, adsorbed both on (100) surface of 0.4 μm AgBr cubic crystal and (111) surface of 1.8 μm AgBr tabular crystal, were studied with combination of spectroscopy and atomic force microscopy (AFM) technique. Rectangular aggregation structure is formed on the crystal faces of (100) and (111) for both anionic and cationic dyes, while herringbone-stacking structure is formed by anionic-cationic dye, and a J-band spectrum is correspondingly detected. The photoelectron property of dye-sensitized samples was also investigated with microwave absorption and dielectric spectrum detection technology. After excited by a 355 nm fast-pulse laser, the photoelectron decay process of anionic-cationic dye sensitized sample is the fastest. This indicates that the affection of anionic-cationic dye aggregates to the photoelectron decay is the biggest, and the sensitization is more efficient.

关键词： dye sensitization aggregate optoelectronic conversion photoelectron

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Empirical Research of Farmer College Students' Learning Ability and Learning Effect in the Digital Environment

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Asian Agricultural Research 2013年第8期5卷 108-113,118页

作者： jixian zhang Zhejiang Radio and TV University

In the course of training farmer college students,there have been a number of problems facing the modern distance education based on digital learning environment,such as weak learning adaptability and ability of farmers and diverse learning *** the empirical methods of questionnaire survey and interview,this article conducts an analysis of the farmer college students' digital learning ability and learning effect,and based on the theoretical study and practical achievements,explores some aspects,such as the information literacy and entrepreneurship ability training for farmer college students,the reform of course teaching and practice teaching,and the building of digital learning platform and special *** finally some innovative ideas and recommendations are put forth.

关键词： Learning needs Digital learning environment Learni

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