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The trend of the APRGP velocity field and plates movement derived from GPS data

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Science China(Physics,Mechanics & Astronomy) 2010年第4期53卷 767-772页

作者： CHENG PengFei , WANG Hua, CHENG YingYan, WEN HanJiang & CAI YanHui chinese {2. of surveying and {4., beijing 100039, China chinese academy of {2. and map.ing Beijing China

High-precision data processing theories and methods for the wide area GPS network–––Asia Pacific Regional Geodesy Project (APRGP), are systematically discussed in this article. With the software bernese5.0 update, the annual results of APRGP coordinate, velocity field and the trend of plate movement are reestimated, and the corresponding accuracy of adjustment with different constraints, also the velocity field of APRGP, are presented and analyzed. Conclusions could be drawn that Eurasian plate (EURA) rotates clockwise, the Australian plate (AUST) and the Indian plate (INDI) move from southwest to northeast, while the Pacific plate (PCFC) is drifting to northwest, which shows agreement with those of IGS results.

关键词： APRGP Bernese5.0 GPS Data processing velocity field plate movement

U-Pb dating of zircon from the bed parallel anatectic granitic intrusion in the Baoban group in Hainan Island and the tectonic implication

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Science China Earth Sciences 2005年第12期48卷 2092-2103页

作者： Ding Shijiang1, HU Jianmin2. SONG Biao3,4. CHEN Mulun1, XIE Shengzhou1 & FAN Yuan1 1. Geological surveying Institute of Hainan, Haikou 5702.6, China 2. Institute of Geomechanics, {2. academy of Geological Sciences, beijing 100081, China 3. beijing Center of SHRIMP, beijing 100037, China 4. Institute of Geology, {2. academy of Geological Sciences, beijing 100037, China Geological surveying Institute of Hainan Haikou China Institute of Geomechanics Chinese Academy of Geological Sciences Beijing China beijing Center of SHRIMP Beijing China Institute of Geology Chinese Academy of Geological Sciences Beijing China

The petrological and geochemical features of the bed parallel granitic intrusion in the Pre-Cambrian Baoban group in Hainan Island attest to the anatexis origin of the granites. U-Pb dating analyses of zircons from the anatectic granite and the biotite two-feldspar gneiss in the Baoban group, using SHRIMP II in the {2. Ion-probe Center, acquire 2.6Pb/2.8U ages of 368±3.5 Ma (of granite, 95% confidence level, MSDW=1.2.) and 362.9±6.1 Ma (of gneiss, 95% confidence level, MSDW = 2.04. respectively. The two late Devonian ages indicate consistently a tectonic- thermal event experienced in Hainan Island, and are the first discovered record of the Devonian geological process in the district. This event possibly resulted from the deep ther-mal-dynamic process when the Gondwana continent began to break up in the Devonian period.

关键词： Hainan Island, Devonian period, anatectic granite, zircon SHRIMP U-Pb dating.

A new method of ionospheric-free hybrid differential positioning based on a double-antenna CAPS receiver

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Science China(Physics,Mechanics & Astronomy) 2009年第3期52卷 368-375页

作者： GUO JinYun1,2. HAN YanBen1 & CHANG XiaoTao3 1 National Astronomical Observatories, chinese academy of Sciences, {2. 100012. China 2.College of Geodesy and Geomatics, Shandong University of Science and Technology, Qingdao 2.6510, China 3 chinese academy of surveying and map.ing, beijing 100039, China National Astronomical Observatories Chinese Academy of Sciences Beijing China College of Geodesy and Geomatics Shandong University of Science and Technology Qingdao China chinese academy of {2. and map.ing Beijing China

chinese Area Positioning System (CAPS) is a transmitted satellite navigation system moved by the chinese academy of Sciences. Three basic modes of navigation and positioning with CAPS are given, and then a comparative analysis is made in this paper. In terms of the principle that the ionospheric delay is at an inverse ratio to the frequency square, a new ionospheric-free positioning method based on a double-antenna CAPS receiver is put forward. Then the hybrid differential observations and the solving equations and algorithms for one epoch and multi epochs are deduced according to the basic principle of the method. The method may remove the global errors in signal emission, propagation, transmission and receiving (e.g., ionospheric delay, hardware delay, and clock error). So it is very convenient for the single-epoch solution and multi-epoch navigation and positioning, and may efficiently improve the precision of real time CAPS navigation. Furthermore, the method can be used not only for the geometric orbit determination of CAPS GEO and IGSO satellites and the navigation and positioning, but also for the estimation of the tropospheric zenith delay, which is useful for the study of water vapor changes in the atmosphere. Polynomials are used in this method to express the tropospheric zenith delay and CAPS satellite orbits within the limited time interval, which reduces the num- ber of unknown parameters and thus speeds the computation.

关键词： chinese Area Positioning System (CAPS) ionospheric-free linear combination double-antenna receiver hybrid differential positioning method

The gravitational gradient tensor’s invariants and the related boundary conditions

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Science China Earth Sciences 2010年第5期53卷 781-790页

作者： YU JinHai1,2.3 & ZHAO DongMing4.1 College of Earth Science, Graduate University of chinese {2. of Sciences, {4. 10004., China 2.Institute of Geodesy and Geophysics, chinese {2. of Sciences, Wuhan 4.0077, China 3 State Key Laboratory of Astronautic Dynamics, Xi’an 71004., China 4.Zhengzhou Institute of surveying and map.ing, Zhengzhou 4.0052. China College of Earth Science Graduate University of Chinese Academy of Sciences Beijing China Institute of Geodesy and Geophysics Chinese Academy of Sciences Wuhan China State Key Laboratory of Astronautic Dynamics Xi’an China Zhengzhou Institute of surveying and map.ing Zhengzhou China

Here we report new approaches of recovering the Earth gravitational field from GOCE (Gravity field and steady-state Ocean Circulation Explorer) gradiometric data with the help of the gradient tensor’s invariants. Our results only depend on GOCE satellite’s position and gradiometry, in other words, they are completely independent of the satellite attitude. First, starting from the invariants, linearization models are established, which can be referred as the general boundary conditions on the satellite’s orbit. Then, the spherical approximation expressions for the models are derived, and the corresponding solving methods for them are discussed. Furthermore, considering effects of J2.term, the spherical approximation models are improved so that the accuracies of the boundary conditions can be theoretically raised to O ( J 2.2.T), which is approximately equivalent to O(T2.. Finally, some arithmetic examples are constructed from EGM96 model based on the derived theories, and the computational results illustrate that the spherical models have accuracies of 10-7 and the order recovering the gravitational field can reach up to 2.0, and the models with regard to effect of J2.term have accuracies of 10-8 and the order can reach up to 2.0.

关键词： the Earth’s gravitational field gravitational gravidiometry tensor’s invariant

Variational solution about over-determined geodetic boundary value problem and its related theories

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Science China Earth Sciences 2007年第4期50卷 555-562页

作者： YU JinHai1,2.& PENG FuQing3 1 Institute of Geodesy and Geophysics, chinese {2. of Sciences, Wuhan 4.0077, China 2.College of Earth Scienc, Graduate University of chinese {2. of Sciences, {4. 10004., China 3 Zhenghou Institute of surveying and map.ing, Zhengzhou 4.0052. China Institute of Geodesy and Geophysics Chinese Academy of Sciences Wuhan China College of Earth Scienc Graduate University of Chinese Academy of Sciences Beijing China Zhenghou Institute of surveying and map.ing Zhengzhou China

A new solving method for Laplace equation with over-determined geodetic boundary conditions is pro- posed in the paper, with the help of minimizing some kinds of quadratic functional in calculus of variation. At first, the so-called variational solution for over-determined geodetic boundary value problem is defined in terms of principles in calculus of variation. Then theoretical properties related with the solution are derived, especially for its existence, uniqueness and optimal approximation. And then the computational method of the solution is discussed, and its expression is exhibited under the case that all boundaries are spheres. Finally an arithmetic example about EGM96 gravity field model is given, and the computational results show that the proposed method can efficiently raise accuracy to deal with gravity data. In all, the variational solution of over-determined geodetic boundary value problem can not only fit to deal with many kinds of gravity data in a united form, but also has strict mathematical basements.

关键词： earth’s gravity field over-determined boundary value problem quadratic functional. variational solution optimal approximation

General inverse of Stokes, Vening-Meinesz and Molodensky formulae

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Science China Earth Sciences 2006年第5期49卷 499-504页

作者： CHENG Luying1,2.& XU Houze1 1. Institute of Geodesy and Geophysics, chinese {2. of Sciences, Wuhan 4.0077, China 2. Xi’an Research Institute of surveying and map.ing, Xi’an 710054. China Institute of Geodesy and Geophysics Chinese Academy of Sciences Wuhan China Xi’an Research Institute of surveying and map.ing Xi’an China

The operator operations between the disturbing potential and the geoidal undulation, the gravity anomaly, the deflection of the vertical are defined based on the relations among the gravity potential, the normal gravity potential and the disturbing potential. With the sphere as the boundary surface, based on the solution of the external boundary value problem for the disturbing potential by the spherical harmonics in the physical geodesy, the general inverse Stokes’ formula, the general inverse Vening-Meinesz formula and the general Molodensky’s formula are derived from the operator operations defined. The general formulae can get rid of the restriction of the classical formulae only used on the geoid. If the boundary surface is defined as the geoid, the general formulas are degen- erated into the classic ones.

关键词： spherical harmonics, boundary value problem, general inverse Stokes' formula, general inverse Vening-Meinesz formula, general Molodensky's formula.

Conceptual design,data model and key techniques of“3D Assistant”

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中国有色金属学会会刊：英文版 2011年第S3期21卷 692-698页

作者： LI Qing-yuan1, ZHANG Xuan2. JIN Yang2. ZHOU Hui3, WANG Qian-jin3,WEI Zhan-yin1 1. Key Laboratory of Geo-Informatics, chinese {2. of surveying and map.ing, {4. 100830, China 2. School of Geo-Science and surveying Engineering, China University of Mining and Technology, {4. 100083, China 3. School of Geomatics, Liaoning Technical University, Fuxin 12.000, China Key Laboratory of Geo-Informatics Chinese Academy of Surveying and Mapping Beijing 100830 China School of Geo-Science and surveying Engineering China University of Mining and Technology Beijing 100083 China School of Geomatics Liaoning Technical University Fuxin 123000 China

Conceptual design, data model and key techniques of "Geo-engineer 3D assistant", an underground 3D GIS oriented to geology and mine application, were discussed. In particular, the importance of high-order smoothing triangular pieces to surface's fine expression in geological modeling was emphasized. The contour mode is the most favorite mode of the three modes about surface expression: DEM, TIN and contour. Topology in underground 3D modeling with CAGD was compared. From the view of boundary and coboundary, which is soul of IS 19107 (Geographic information spatial schema), 3D underground topology was re-examined.

关键词： 3D assistant true 3D GIS fine expression of surface contour mode 3D topology

Extraction of LUCC with different methods and threshold value

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中国有色金属学会会刊：英文版 2005年第S1期15卷 236-239页

作者： WANG Ping~(1,2., ZHENG Yong-guo~1, LIN Zong-jian~2. ZHANG Ji-xian~2. ZHOU Chun-yan~1 (1. Shandong University of Science and Technology, Taian 2.1019, China 2. chinese academy of surveying and map.ing,{2., China)

The research of land use and land cover (LUCC) is an important aspect in the global change research. The goal of this study is to find methods of extraction of LUCC’s change outlined and change type from remotely sensed data. Take the country of Fengxian in Shanghai as an example, it was supposed two steps to finish extraction of LUCC information: the first step was to use different methods, which is used to outline change areas; the second step include methods of false composing of two-temporal and threshold value. Through combining two methods, a model rule is built and the LUCC product is obtained, four kinds of change type within the study area are given, and the results are obvious. Finally, the results support the application of the high resolution image and tasseled cap composition (greenness and wetness) in the specific regional too.

关键词： different method land use and land cover change threshold tasseled cap

From Physical Space to Visual Image Space

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Geo-Spatial Information Science 2003年第2期6卷 42-47页

作者： YE Zetian LIN Hui LIU Xianlin YE Zetian, Ph.D, chinese academy of {2. and map.ing, 16 Beitaip{4. Road, Haidian District, beijing 100039, China. academy of surveying and {2. Haidian District Beijing China

The theoretical framework of visual simulation in virtual reality is discussed. The new concept of visual image space is supposed. On the basis of visual image space, in visual perceptive sense, VR is considered as a spatial simulation. The objective of the spatial simulation is to transform physical space to visual image space. Last, the prototype system, surveying & map.ing virtual Reality (SMVR), is developed, and the space simulation above is realized. By use of SMVR, the real 3D representation, 3D visual analysis, virtual plan and designs can be implemented.

关键词： virtual reality physical space visual image space space of earth surface space simulation