1. 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 ).