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The principle is similar to a magnetic survey carried out with a hand-held magnetometer, but with the airbone drone, the UAV, it allows to cover more quickly difficult access and larger surface areas.
The ECA Group UAV flew for up to two hours automatically in a grid-like pattern following the topology thanks to his embedded DTED (Digital Terrain Elevation Data) with constant height and line spacing.
The resulting aeromagnetic map shows the spatial distribution and relative abundance of magnetic minerals in the upper levels of the Earth crust. Mathematical modelling are used to infer the shape, depth and properties of the rock bodies responsible for the magnetic anomalies.
