Method for calculating global terrain correction based on multi-resolution polyhedron under hexagonal grid index

• Main Authors: WANG AOMING, FENG JINKAI, LI XINXING, FAN HAOPENG, LIU XIAOGANG, LI SHANSHAN, FAN DIAO
• Format: Patent
• Language: Chinese; English
• Published: 24.05.2022
• Subjects: CALCULATING; COMPUTING; COUNTING; IMAGE DATA PROCESSING OR GENERATION, IN GENERAL; PHYSICS

The invention discloses a method for calculating global terrain correction based on a multi-resolution polyhedron under a hexagonal grid index. The method comprises the following steps: constructing a spherical hexagonal grid system H3 of 7-hole subdivision based on an icosahedron; constructing a terrain partitioning strategy under the H3 based on the H3 and each grid parameter; determining a polyhedral model of a multi-resolution terrain by using a corresponding relation between a hexagonal grid and a triangular surface, considering seawater mass density loss, and determining the terrain correction influence on a to-be-calculated point by using a polyhedral integration method; and by utilizing the constructed polyhedral model and the corresponding seawater mass density thereof, determining a gravitational force value corresponding to each polyhedral model at the point to be calculated by using a polyhedral integration method, and taking the sum of a plurality of groups of gravitational force values as a fina