Coons curved surface reconstruction method of marine gravity anomaly map for navigation

Based on the continuation property of the Earth's gravity field, the Coons curved surface modeling of computer graphics was introduced into the reconstruction of the marine gravity anomalies map for navigation, and both the bilinear Coons curved surface gravity anomaly model and bi-cubic C1 Coons curved surface gravity anomaly model for different boundary curves were established. Through the analysis of data within experimental area, results showed that the accuracy of gravity anomaly model based on Coons curved surface was better than that based on moving surface fitting model. Based on the global SRTM30″plus oceanic depth data, the reconstruction of gravity anomaly map based on Coons curved surface using Bouger anomaly was made, and the accuracy was improved by 25% compared with the direct modeling using free air gravity anomalies.