New Extending Edge Method of Potential Field Data

In order to develop a new extending edge method of potential field with reasonable and practical, this paper develops a difference method of extending edge based on the mean value theorem and the maximum value and minimum value theorem. This paper, through designing theoretical model and calculating theoretical data, processes the actual data by difference method of extending edge, analyses the differences between the theoretical data and the results of extending edge, discusses the applied effect of this difference method of extending edge. The results show that the decay trend of the contour of the extending part based on this difference method of extending edge is similar to that of the original contour, especially when the potential field value of the original data block in the boundary is in a declining trend. The study reveals that the outward extending data based on difference method of extending edge are quite reasonable, and the boundary effect is not obvious, so this extending data are suitable for the further processing and inversion. The operation of this extending method is simple and the computing velocity of this method is fast, so this method is suitable for the potential field data with complex boundary, also for the terrain elevation data.