Table of Content

25 August 2009, Volume 38 Issue 4

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学术论文

Extracting Trees from LIDAR Data in Urban Region

2009, 38(4):  0-310. 

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EGM2008 and its Application Analysis in Chinese Mainland

2009, 38(4):  0-310. 

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Periodic geocenter motion measured with SLR in 1993-2006

2009, 38(4):  0-310. 

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The center of mass of Earth (CM) is the center of total Earth’s mass. The geocenter motion may be excitated by the mass redistribution of Earth system, especially the fluid layer. A time series of geocenter motion measured with SLR on LAGEOS 1/2 is estimated and then analyzed with the wavelet transformation and least squares method, respectively. The secular and periodic variations of geocenter motion are detected. The long-term movement indicates that the crustal figure is changing, the north hemisphere and 180-degree hemisphere are shrinking, and the south hemisphere and 0-degree hemisphere are swelling. The seasonal variations are the main components which may be caused from the mass distribution of Earth fluid layer, e.g. ocean, atmosphere and continental water. There are many other periodic or quasi-periodic variations. We find that a small wobble of the core and mantle in the rotating direction may take place. The polar tide of atmosphere can also affect the geocenter motion. There are long periodic variations through 2 to 5 years. Many periods gradually change, which indicates that there exist nonregular fluxes for the environment and mass of the whole Earth system.

Digital Photogrammetric Mapping Near the Southern Pole of the Moon Based on Clementine Imagery and ULCN2005

2009, 38(4):  0-310. 

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