Acta cartographica trial#

Acta cartographica trial#

As for which fitting relation should be adopted specifically, it can be decided by selecting a typical terrain and spontaneous potential curve first and judging through the law of variations and trial calculation method can be adopted as well to choose the appropriate fitting formula by comparing the correction effects. The relation between a majority of anomalies and terrain relief could be linear, quadratic or exponential, among which linear relation is the primary.

According to the study, in spontaneous potential gradient calculation, spontaneous potential anomalies caused by topography can be divided into two types: one is that anomalies have a mirror-image relation with terrain relief, which accounts for the majority of cases the other one is that anomalies have an inverted mirror-image relation with terrain relief. Because the microscopic mechanism of spontaneous potential anomalies formed by terrains is rather complex, it is difficult to obtain an analytic formula, whereas a more intuitive method can be adopted instead to find out the fitting formula between these two variables.

Terrain correction is to eliminate the effect of terrain relief around measurement points on observation results in gravitational and geoelectrical prospecting.