Airborne gravimetry in Bo Hai Bay and its role on the refining of the regional marine geoid

被引：0
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作者：
Sun, Zhongmiao [1 ,2 ]
Zhai, Zhenhe [1 ,2 ,3 ]
Xiao, Yun [1 ,2 ]
机构：
[1] Xi'an Research Institute of Surveying and Mapping, Xi'an
[2] State Key Laboratory of Geo-information Engineering, Xi'an
[3] Institute of Geospatial Information Engineering University, Zhengzhou
来源：
Cehui Xuebao/Acta Geodaetica et Cartographica Sinica | 2014年 / 43卷 / 11期
关键词：
Airborne gravimetry; Grid-overlapping method; Marine geoid; Satellite altimetry; Satellite gravity;
D O I：
10.13485/j.cnki.11-2089.2014.0174
中图分类号：
学科分类号：
摘要：
Offshore airborne gravity plays a very important role in the unifying of the land geoid and marine geoid. Airborne gravimetry using Chinese airborne gravimetry system is flown in Bo Hai Bay in the last three years. The surveying area extends about two hundred thousand square kilometers and 5'×5' grid mean gravity anomaly has been obtained. The gravimetry is summarized and its key processing method is introduced firstly. Then, we discuss the accuracy estimation methods for the airborne gravity in detail, and introduce so-called grid-overlapping method to appropriately evaluate the internal accuracy of the grid mean gravity anomaly. The results indicate that the standard deviation of the crossover errors is about 1.5 mGal at the resolution of 5 arcmin, the standard deviation of the 5'×5' grid mean gravity anomaly evaluated by grid-overlapping method is about 1.6 mGal, and the accuracy of the 5'×5' grid mean gravity anomaly are better than 3.0 mGa1 compared with the satellite altimetry gravity data and the seaborne gravity data respectively. The systemic error and the standard deviation of the 1°×1° mean airborne gravity compared with the GOCE gravity field model are less than 0.5 mGal and about 2.7 mGal respectively. The accuracy of the regional geoid using airborne gravity data in the surveying area is improved to 12 cm, whereas it is about 23 cm computed from EGM 2008 model. ©, 2014, SinoMaps Press. All right reserved.
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页码：1101 / 1108
页数：7
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