In this paper, a new approach to calculating bouguer slab and topography in one step using forward modeling of mass located between the ground surface and the reference surface (model space) is introduced. In the first step, we use advanced (Octree) and (quadtree) meshes to parameterize the model space. These meshes have the ability to produce very small cells at the location of gravity points on the ground surface. The topographical effects are computed with high accuracy.
In the second step, the effectiveness of all cells of these meshes at gravity points on the ground is calculated using forward modeling. This effect of gravity represents the sum of bouguer scores and topography, which is calculated by subtracting this sum from the observed gravity value of the complete Bouguer anomaly