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 an intensity of a magnetic field on a geographic area producing a set of intensity magnetometric data B(s) as a survey forming a map of magnetic anomalies, s representing a curvilinear abscissa along a trajectory of the survey; a step of 2D-interpolation calculation applied to the set of intensity magnetometric data B(s) producing a set of intensity magnetometric data B(x,y) referred to according to referentials x and y on a 2D interpolation map; a step of calculating a reduction to poles 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 of the poles; a step of calculating an analytical signal applied to the set of interpolated intensity magnetometric data producing a set of analytical magnetometric data represented on a 2D map of the analytical signal gridding the map of magnetic anomalies into a matrix of pixels; a step of local and real-time updating of the map of magnetic anomalies by an elementary measuring step of the intensity of the magnetic field on a reduced geographic area producing an elementary series of magnetometric data associated with an updated pixel; a step of local and real-time updating of the 2D interpolation map by applying the 2D interpolation calculation in a vicinity of the updated pixel, producing pixels on an updated 2D interpolation map; a step of local and real-time updating of the 2D reduction map to the poles by application to the updated 2D interpolation map of the reduction calculation to the poles for the updated pixel and in the vicinity of said updated pixel , producing pixels on an updated map of magnetometric data reduced to the poles; and a step of local and real-time updating of the 2D map of the analytical signal by application to the updated 2D interpolation map of the calculation of the analytical signal for the updated pixel and in the vicinity of said updated pixel, producing pixels on an updated map of analytical magnetometric data.