Method for acquiring and processing magnetometric data by local updates in real time

A method for acquiring and processing magnetometric data for at least two-dimensional map representation of magnetometric features of a geographic area including:

• a step of measuring the intensity of the magnetic field (1) on a geographic area producing a set of intensity magnetometric data B(s) forming a map of magnetic anomalies (2), s representing the curvilinear abscissa along the trajectory of the survey,
• a step of 2D-interpolation calculation (3) applied to the set of intensity magnetometric data B(s) producing a set of intensity magnetometric data B(x,y) referred to according to the referentials x and y on a 2D interpolation map (4),
• a step of calculating the reduction to the poles (5) applied to the set of interpolated intensity magnetometric data B(x,y) producing a set of magnetometric data reduced to the poles B′(x,y) represented on a 2D reduction map to the poles (6),
• a step of calculating the analytical signal (7) applied to the set of interpolated intensity magnetometric data B(x,y) producing a set of analytical magnetometric data B′(x,y) represented on a 2D map of the analytical signal (8),
• characterised in that it includes:
• gridding the map of magnetic anomalies (2) into a matrix of pixels,
• a step of local and real-time updating of the map of magnetic anomalies by an elementary measuring step (22) of the intensity of the magnetic field on a reduced geographic area producing an elementary series of magnetometric data associated with an updated pixel (23),
• a step of local and real-time updating of the 2D interpolation map (24) by applying the 2D interpolation calculation in the vicinity of the updated pixel (25), producing pixels on an updated 2D interpolation map (26),
• a step of local and real-time updating of the 2D reduction map to the poles (27) by application to the updated 2D interpolation map (26) of the reduction calculation to the poles for the updated pixel (23) and in the vicinity of said updated pixel (25), producing pixels on an updated map of magnetometric data reduced to the poles (28),
• a step of local and real-time updating of the 2D map of the analytical signal (29) by application to the updated 2D interpolation map (26) of the calculation of the analytical signal for the updated pixel (23) and in the vicinity of said updated pixel (25), producing pixels on an updated map of analytical magnetometric data (30).