Key Laboratory of Surveying and Mapping on Island and Reef of SBSM

Qingdao, China

Key Laboratory of Surveying and Mapping on Island and Reef of SBSM

Qingdao, China
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Guo J.,Shandong University of Science and Technology | Guo J.,Key Laboratory of Surveying and Mapping on Island and Reef of SBSM | Song L.,Shandong University of Science and Technology | Song L.,Key Laboratory of Surveying and Mapping on Island and Reef of SBSM | And 2 more authors.
Wuhan Daxue Xuebao (Xinxi Kexue Ban)/Geomatics and Information Science of Wuhan University | Year: 2011

The digital zenith camera combining GPS and CCD techniques can be used to rapidly and precisely measure the vertical deflection based on the astrogeodetic theory. Basic framework of digital zenith camera is given. Algorithms to calculate the vertical deflection from GPS measurement and CCD star images are shown. Errors of vertical deflection measured with digital zenith camera are analyzed by considering the instrumental structure and observing procedure. The automation to measure the veritical deflection and the result precision with the digital zenith camera are better than those with the traditional astrogeodetic technique.


Chang X.,Chinese Academy of Surveying and Mapping | Chang X.,Key Laboratory of Surveying and Mapping on Island and Reef of SBSM | Guo J.,Key Laboratory of Surveying and Mapping on Island and Reef of SBSM | Guo J.,Shandong University of Science and Technology | Guo J.,CAS National Astronomical Observatories
Terrestrial, Atmospheric and Oceanic Sciences | Year: 2011

DInSAR techniques can be used to monitor changes in desert height due to sandstorms. Hunshandake Sandy Land was used as the test area and was a main source of sand in the vicinity of Beijing. In order to study the source of sandstorm and its impact, a pair of EnviSat ASAR images for January 20 and October 26,2004 were processed. After the image configuration, flat earth effect correction, data filtering, phase unwrapping and geo-coding, a deformation model over Hunshandake was built. The deformation in the test area ranges from -160 to +120 cm, and the height increased in most areas and decreased in a few locations, which is generally consistent with the sandstorm appearing at Beijing during 2004.


Liu X.,Shandong University of Science and Technology | Guo J.,Shandong University of Science and Technology | Guo J.,Key Laboratory of Surveying and Mapping on Island and Reef of SBSM | Guo J.,Chinese Academy of Sciences | And 3 more authors.
Applied Mechanics and Materials | Year: 2011

Based on satellite dynamics, 1 year's CHAMP geometric precise orbit data are used in this paper to fit the satellite orbits by Cowell II numerical integral and partitioned Bayesian least square parameter estimation. Time series of low degree geopotential coefficients J 2 and J 3 are respectively calculated, which reflects obviously seasonal variations of J 2 and J 3. The results J 2 = -0.783×10 -11/ month, J 3 = -0.5×10 -12/month indicate the geodynamical shape of the earth is getting rounder and rounder and at the same time its pear-shaped component adds gradually. © (2011) Trans Tech Publications.

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