CQG2000模型在青藏高原地区的精度检验及其对区域重力调查工作的意义
Application of Accurate Inspection of CQG2000 Quasi-Geoid Model to Regional Gravity Survey in Qinghai-Tibet Plateau
-
摘要: 区域重力调查中,测点正常高的精度直接影响重力测量成果的精度。利用CQG2000似大地水准面模型对GPS测得的大地高程进行改算,可得到较高精度的正常高成果。然而,CQG2000似大地水准面模型在不同地区的精度和分辨率是不同的,在青藏高原地区精度相对差些。通过对CQG2000似大地水准面模型在青藏高原地区精度的实地检验,证实其在该地区的精度可以满足1:20万区域重力调查工作中求取测点正常高的精度需要。通过上述实验,总结出用CQG2000模型提高区域重力调查中GPS高程测量精度的方法,对区域重力调查工作有重要意义。Abstract: During regional gravity survey,accuracy of orthometric height may affect the accuracy of gravity survey directly.With CQG2000 quasi-geoid model,or thometric height with higher accuracy can be acquired through calibrating geodetic altitude measured by GPS.However,the accuracy and resolution of CQG2000 quasi-geoid model are different in different areas and become worse in Qinghai-Tibet plateau. The field test in Qinghai-Tibet plateau show that the accuracy of CQG2000 quasi-geoid model can satisfy the accuracy of orthometric height during the the 1:200000 regional gravity survey.Based on the test,we summarize the method how the accuracy of height measurement can be improved by GPS with CQG2000 quasi-geoid model during the regional gravity survey,which may be helpful to regional gravity survey.
-
Key words:
- quasi-geoid model /
- Qinghai-Tibet plateau /
- GPS surveying /
- accuracy /
- inspection
-
-
计量
- 文章访问数: 2782
- PDF下载数: 3151
- 施引文献: 0
下载: