Abstract: In this paper, the influence of different spatial gravity anomaly accuracy on the correction of gravity anomaly in leveling is analyzed. Two correction methods of measured gravity and Bouguer anomaly database are used to calculate the correction values of gravity anomalies in two test areas in Jiangsu province, and the differences between the two correction values are compared. The results show that the measured distribution of gravity points without regard to topographic relief is the main factor that causes the difference between the two correction methods. In the area with large topographic relief, if the leveling line turns or tilts too much, the gravity of measuring point should be added, and the measured gravity should be used to correct the gravity anomaly of leveling height difference. The accuracy of Bouguer anomaly database and gravity leveling is similar in small flat area.

Key words: regional gravity survey, gravity anomaly correction, Bouguer anomaly, measured gravity, height difference