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The Terminal of Mineral System Exploration in Thick Coverage Area by Gravity and Magnetic Data――A Case Study on the Nihe Iron Deposit

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Acta Geologica Sinica(English Edition) 2021年第S1期95卷 118-120页

作者： ZHOU Wenyue YAN Jiayong CHEN Changxin china aero geophysical survey and remote sensing center for Natural resources Beijing 100083China School of Geophysics and Information Technology China University of Geosciences(Beijing)Beijing 100029China Key Laboratory of Airborne Geophysics and remote sensing Geology Ministry of Natural ResourcesBeijing 100083China Chinese Academy of Geological Sciences Beijing 100037China china Deep Exploration center-SinoProbe center Chinese Academy of Geological Sciences and China Geological SurveyBeijing 100037China

The study is concerned with the airborne magnetic and gravity data aiming at evaluating the terminal of mineral *** iron deposit,situated in the center of Luzong ore cluster area,is the case to our *** tectonic environments,source material,and preservation background illustrate distinct properties in the geophysical observation results.

关键词： mineral system gravity and magnetic exploration ore deposit

3D Surface velocity retrieval of mountain glacier using an offset tracking technique applied to ascending and descending SAR constellation data:a case study of the Yiga Glacier

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International Journal of Digital Earth 2019年第6期12卷 614-624页

作者： Qun Wang Jinghui Fan Wei Zhou Liqiang Tong Zhaocheng Guo Guang Liu Weilin Yuan Joaquim Joao Sousa Zbigniew Perski School of land Science and Technology China University of GeosciencesBeijingPeople’s Republic of China Division of remote sensing for Environment China Aero Geophysical Survey and Remote Sensing Center for Land and ResourcesBeijingPeople’s Republic of China Key Laboratory of Digital Earth Science Institute of Remote Sensing and Digital EarthChinese Academy of SciencesBeijingPeople’s Republic of China School of Sciences and Technology University of Trás-os-Montes e Alto DouroVila RealPortugal Centre for Robotics in Industry and Intelligent Systems INESC TECPortoPortugal Polish Geological Institute—National Research Institute CracowPoland

COSMO-SkyMed is a constellation of four X-band high-resolution radar satellites with a minimum revisit period of 12 *** satellites can obtain ascending and descending synthetic aperture radar(SAR)images with very similar periods for use in the three-dimensional(3D)inversion of glacier *** this paper,based on ascending and descending COSMO-SkyMed data acquired at nearly the same time,the surface velocity of the Yiga Glacier,located in the Jiali County,Tibet,china,is estimated in four directions using an offset tracking technique during the periods of 16 January to 3 February 2017 and 1 February to 19 February *** the geometrical relationships between the measurements and the SAR images,the least square method is used to retrieve the 3D components of the glacier surface velocity in the eastward,northward and upward *** results show that applying the offset tracking technique to COSMO-SkyMed images can be used to derive the true 3D velocity of a glacier’s *** the two periods,the Yiga Glacier had a stable velocity,and the maximum surface velocity,2.4 m/d,was observed in the middle portion of the glacier,which corresponds to the location of the steepest slope.

关键词： Mountain glacier inversion of 3D movement offset tracking SAR constellation data

Pinpointing the sources and measuring the lengths of the principal rivers of the world

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International Journal of Digital Earth 2009年第1期2卷 80-87页

作者： S.Liu P.Lu D.Liu P.Jin W.Wang Institute of remote sensing Applications Chinese Academy of SciencesDatun RoadChaoyang DistrictBeijing 100101China china Association for Science and Technology 86 Southern Colleges RoadHaidian DistrictBeijing 100081China china aero-geophysical survey&remote sensing Centre for land and resources 31 Colleges RoadHaidian DistrictBeijing 100083China School of Environment and Nature resources Renmin University of China59 Zhongguancun StreetBeijing 100872China

Cultures throughout the world are associating with the *** depend upon the rivers and their tributaries for food,water,transport,and many other aspects of their daily ***,human beings have not calculated the accurate lengths for the great rivers even *** lengths of the rivers are very different in popular textbooks,magazines,atlases and encyclopedias,*** accurately determine the lengths of the principal rivers of the world,the combination of satellite image analysis and field investigations to the source regions is proposed in this *** lengths of the Nile,Amazon,Yangtze,Mississippi,Yellow,Ob,Yenisey,Amur,Congo and Mekong,with lengths over or close to 5000 km,were calculated using the proposed *** results may represent the most reliable and accurate lengths of the principal rivers of the world that are currently achievable.

关键词： principal rivers of the world sources pinpointing lengths measuring satellite remote sensing field explorations

Possible precursory anomalies in ground water level associated with the Wenchuan Ms 8.0 earthquake in 2008,Sichuan,china

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Geodesy and Geodynamics 2020年第2期11卷 127-134页

作者： Chenglong Liu Guangcai Wang Zheming Shi Dan Zhao Hui Zhang Institute of Geology China Earthquake AdministrationBeijing100029China School of Water resources and Environmental Science China University of GeosciencesBeijing100083China china aero geophysical survey and remote sensing center for Natural resources Beijing100083China

We have examined the water level data from 16 wells in Sichuan province,china,recorded before the Wenchuan Ms8.0 earthquake occurred in *** found that the data of 5 among these wells exhibit possible precursory anomalies,which are respectively named the Chuan No.08 well in Deyang,Chuan *** well in Pujiang,Chuan No.13 well in Luzhou,Chuan No.22 well in Qionglai and *** time durations,these anomalies are of long-,intermediate-and short-term signals which are primarily distributed on the northeast(NE)trending Longmenshan fault zone as well as the parallel Huayingshan fault *** seems that the variations of the well levels on the Huayingshan fault zone imply compression while those on the Longmenshan fault zone reflect *** anomalies occurred first in the areas outside the epicenter region of the Wenchuan Ms8.0 earthquake,then migrated to the seismogenic fault *** they migrated from southwest to northeast in agreement with the rupture process of the main shock.

关键词： Wenchuan earthquake Precursory anomalies Ground water level Temporal-spatial distribution Sichuan province

Study on the Coincident-Loop Transient Electromagnetic Method in Seafloor Exploration——Taking Jiaodong Polymetallic Mine as a Model

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Journal of Earth Science 2021年第1期32卷 25-41页

作者： Yixing Ma Junhua Hu Yanjun Chang Zujian Liu Development and Research center of china Geological survey Beijing 100037China Technical Guidance center for Mineral resources of Ministry of Natural resources Beijing 100083China State Key Laboratory of Simulation and Regulation of Water Cycle in River Basin China Institute of Water Resources and Hydropower ResearchBeijing 100038China Department of Structures and Materials China Institute of Water Resources and Hydropower ResearchBeijing 100038China Institute of Geophysics and Geometrics China University of GeosciencesWuhan 430074China china aero geophysical survey and remote sensing center for Natural and resources Beijing 100083China

The transient electromagnetic(TEM)method becomes more urgent than ever for marine ex-ploration due to abundant resource reserves and the increasing undersea engineering construction activities,especially in the offshore exploration of mineral deposits such as Sanshandao gold ***,the re-search and application of TEM method in marine environment are still challenged by many *** contradiction motivates our study on the coincident-loop TEM in seafloor *** TEM response of coincident loops is firstly derived in the integral form,based on the potential functions in Helmholtz equ-ations for a magnetic source locating in the whole-space layered *** frequency-domain vertical magnetic field is described as the Hankel integral with double first-order Bessel functions of first ***-condly,the time-domain induced voltage is obtained by transforming the frequency-domain response through the cosine transform and then taking the derivative of *** simultaneously solve the Hankel transform and the cosine transform,a novel algorithm is introduced by adapting the fixed-point quadra-ture and extrapolation via the Shanks ***,a typical conductivity model for marine po-lymetallic deposit is designed to investigate the characteristic of TEM response under various *** results demonstrate that existence of conductive seawater causes the TEM response to increase significantly and decay *** air-sea reflected electromagnetic waves lead to a significantly large fake negative response(NR)in shallower seawater with depth less than 300 *** in the height of loops will weaken and delay the anomaly response and shorten the observation *** height of configu-ration should be no more than 100 m for shallower targets and 50 m for deeper targets,*** observation time-window should cover 10-1000 *** in the radius of loops only enhances the TEM response proportionally but hardly improve

关键词： marine transient electromagnetic method coincident loops induced polarization air-wave effects

Inversion of time-domain airborne EM data with IP effect based on Pearson correlation constraints

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Applied Geophysics 2020年第4期17卷 589-600页

作者： Man Kai-Feng Yin Chang-Chun Liu Yun-He Ren Xiu-Yan Sun Si-Yuan Miao Jia-Jia Xiong Bin College of Geo-Exploration Sciences and Technology Jilin UniversityChangchun 130026China china aero geophysical survey and remote sensing center for Natural resources Beijing 100083China china Geological Equipment Research Institute co. LtdBeijing 100120China College of Earth Sciences Guilin University of TechnologyGuilin 541006China

Due to the induced polarization(IP)eff ect,the sign reversal often occurs in timedomain airborne electromagnetic(AEM)*** inversions that do not consider IP eff ect cannot recover the true umderground electrical *** view of the fact that there are many parameters of airborne induced polarization data in time domain,and the sensitivity diff erence between parameters is large,which brings challenges to the stability and accuracy of the *** this paper,we propose an inversion mehtod for time-domain AEM data with IP effect based on the Pearson correlation *** method uses the Pearson correlation coeffi cient in statistics to characterize the correlation between the resistivity and the chargeability and constructs the Pearson correlation constraints for inverting the objective function to reduce the non uniqueness of *** verify the eff ectiveness of this method,we perform both Occam’s inversion and Pearson correlation constrained inversion on the synthetic *** experiments show that the Pearson correlation constrained inverison is more accurate and stable than the Occam’s ***,we carried out the inversion to a survey dataset with and without IP eff *** results show that the data misfit and the continuity of the inverted section are greatly improved when the IP eff ect is considered.

关键词： Time-domain AEM induced polarization effect forward modeling inversion Pearson correlation constraints

Using object-based analysis to derive surface complexity information for improved filtering of airborne laser scanning data

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Frontiers of Earth Science 2017年第1期11卷 11-19页

作者： Menglong YAN Thomas BLASCHKE Hongzhao TANG Chenchao XIAO Xian SUN Daobing ZHANG Kun FU Key Laboratory of Technology in Geo-Spatial Information Processing and Application System Institute of Electronics Chinese Academy of Sciences Beijing 100190 China Z GIS - Centre for Geoinformatics and Department for Geography and Geology University of Salzburg Salzburg A-5020 Austria Satellite Mapping Application center State Bureau of Surveying and Mapping Beijing 100048 China china aero geophysical survey and remote sensing center for land and resources Beijing 100083 China

Airborne laser scanning （ALS） is a technique used to obtain Digital Surface Models （DSM） and Digital Terrain Models （DTM） efficiently, and filtering is the key procedure used to derive DTM from point clouds. Generating seed points is an initial step for most filtering algorithms, whereas existing algorithms usually define a regular window size to generate seed points. This may lead to an inadequate density of seed points, and further introduce error type I, especially in steep terrain and forested areas. In this study, we propose the use of object- based analysis to derive surface complexity information from ALS datasets, which can then be used to improve seed point generation. We assume that an area is complex if it is composed of many small objects, with no buildings within the area. Using these assumptions, we propose and implement a new segmentation algorithm based on a grid index, which we call the Edge and Slope Restricted Region Growing （ESRGG） algorithm. Surface complexity information is obtained by statistical analysis of the number of objects derived by segmentation in each area. Then, for complex areas, a smaller window size is defined to generate seed points. Experimental results show that the proposed algorithm could greatly improve the filtering results in complex areas, especially in steep terrain and forested areas.

关键词： airborne laser scanning object-based analysis surface complexity information filtering algorithm

Application of X-ray fluorescence measurement technology in rapid ore prospecting

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Application of X-ray fluorescence measurement technology in ...

Lithologic Characteristics of the Southeast Coast Reflected by aeromagnetic Data

第三届全国青年地质大会

作者： Hai Yang Xingtao Kuang Shijun Li Yi Gu Qingxian Zhang china aero geophysical survey and remote sensing center for land and resources Chengdu university of Tecnology

1 Introduction Many geophysical and geochemical methods could be chosen for prospecting,but it is impossible to use one by one in the practical ***,the selected method has a significant impact on the efficiency and effectiveness of *** a radiation sampling method,X-ray fluorescence measurement(XRF)is widely used in en-

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Lithologic Characteristics of the Southeast Coast Reflected ...