1. Constructs various analytically and harmonized topographic effects field outside geoid, and then develops topographic effects algorithms system of anomalous field elements based on gravity field theory. Employs various topographic effects remove-restore scheme to improve heterogeneous data fusion and to increase the approached stability and error suppression ability of local gravity field. 2. Builds Integral solution conditions about gravity field boundary value problem, replaces most of differential operations with integral operations, and then develops a group of completer integral algorithms including the precise integral, inverse operation and up-downward analytical continuation. With these algorithms, the approached performance of local gravity field can be comprehensively improved. 3. On the basic of gravity field principles, develops some ingenious physical geodetic algorithms relied on gravity field data, to further optimize regional height datum and expand geodetic application. 4. With the previous numerical integral solutions as the reference gravity field based on the uniqueness and harmony of the integral solutions, constructs remove-restore schemes to play a scale controlling role of the previous solutions, to approach the current local gravity field and to refine a very small area geoid. So that the seamless splicing problem between the adjacent geoid models will become disappeared, and the current geoid model can be rigorously compatible with the previous geoid model. |