Automatic extraction method of magnetic structural framework in low latitude areas

The invention provides an automatic extraction method of a structural framework. The method comprises the following steps of performing horizontal-gradient multi-directional edge detection for gridded magnetic and gravity anomaly data at multiple scales based on tilt derivatives and obtaining the edge of each scale; using a morphological skeletal algorithm for thinning the calculated edge of each scale; and obtaining different types of structural framework maps at the multiple scales by giving the cutting depth, burial depth and magnetic or density properties to each edge point, and generating comprehensive structural framework maps of all the types by superposing the structural framework maps of the same type. The method according to the invention can identify and provide qualitative interpretation of the formed geological structure of controlled ore deposits, and achieve target localization of metallic ore deposits. The invention is particularly applicable to the automatic extraction of the magnetic structural framework in low latitude areas.