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Predicting Earth magnetic anomalies from measured EMAG2 data

Magnetic anomaly maps are important for scientific and practical applications; such as they provide insight into the subsurface structure and composition of the Earth's terrestrial and oceanic crusts. These maps are widely applicable for geological exploration and detection of man-made subsurface anomalies. There is available high-resolution 2 arc-minute global Earth Magnetic Anomaly Grid data (EMAG2) at 4 km above the geoid [1], which has been created using various satellite, ship, and airborne magnetic measurements. However, many. if not all. practical applications require EMAG data at different elevations and different resolutions. To achieve this demand here EMAG2 data at 4 km elevation is remapped at different elevations and resolutions using the method of auxiliary sources. Comparisons between predicted and measured data are demonstrated.