Earth Gravity Field Fitting Using EGM96 Data

Using MATLAB to perform Earth's gravity field fitting with EGM96 data enables the calculation of gravity anomalies, height anomalies, and vertical deflections at arbitrary points on Earth. The implementation typically involves reading spherical harmonic coefficients from EGM96 datasets, applying normalization factors, and computing Legendre polynomial expansions. Through analysis and research of these derived parameters, one can gain deeper insights into geophysical theories and practical applications, explore Earth's internal structure and material distribution patterns, and provide valuable data support for scientific research in fields such as geological exploration, astronomical surveying, and geodetic measurements. Furthermore, by learning and applying MATLAB software, researchers can enhance their scientific computing capabilities and programming skills, thereby strengthening their competitiveness in related domains. Key functions used may include gravitysphericalharmonic for coefficient handling and geoidheight for anomaly calculations, with algorithms based on degree-360 spherical harmonic expansions.