Originally, GPS was used as a tool of establishing the precision class of geodetically networks and various of controlling networks .With the development of GPS techniques, great changes have taken in every fields of surveying and mapping.

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By using the data sets of the oceanic and atmospheric angular momentum during 1985~1995, the mean energy of the oceanic and atmospheric excitation in Chandler wobble band is estimated and compared with that of the geodetically observed excitation.

用1985~1995年期間海洋角動(dòng)量變化序列和大氣角動(dòng)量變化序列色色网激情网，分析它們對(duì)Chandler擺動(dòng)的激發(fā)能量以及它們與天文觀測(cè)激發(fā)的相干性。