Application of magnetic field derivatives for locating Sarmatian graves

Present authors developed a magnetic-gradient method for near-surface archeological investigations and applied it to a site in the vicinity of Hajdúdorog (Hungary). We derive several sets of coefficients which can be used in approximating of magnetic field derivatives or gradients with respect to variables x (North), y (East), and z (vertical). The coefficients determined by inverse Fourier transform form two-dimensional weight functions of digital filters and they are convolved with the measured input data. The derived maps are the relative horizontal and windowed vertical gradients. Several ancient burial sites were located by our method.