Abstract

FERRO-PALACIOS, Ezequiel  and  ISTIZABAL, Edier Ar. Semi-automatic lineament extraction using geospatial analysis techniques. Bol. geol. [online]. 2025, vol.47, n.3, pp.121-143.  Epub Nov 10, 2025. ISSN 0120-0283.  https://doi.org/10.18273/revbol.v47n3-2025006.

By leveraging the efficiency and objectivity of automation applied to the Earth Sciences, it is possible to overcome, among other aspects, the limitations of traditional manual mapping of linear structures, which depend on expert subjectivity. This study presents a novel approach for mapping structural discontinuities in the Colombian Andes through semiautomatic extraction of lineaments from Digital Elevation Models (DEMs). As a result of this extraction, an extensive network of lineaments was obtained with variable densities and preferred orientations according to local geological conditions. Zones of higher density are located in mapped regional faults, validating the method's ability to detect significant discontinuities. Additionally, cellbased analysis revealed spatial patterns in dominant orientations that are not apparent at a regional scale, offering a higher level of detail than blocks defined by major mapped faults. Preferred orientations revealed the predominance of NS-striking horizontal stress, particularly in the Western Cordillera and areas associated with the Romeral Fault System. Beyond specific geological interpretations, this research demonstrates the potential of semiautomatic lineament extraction for systematically and objectively mapping structural discontinuities.

Keywords : Structural lineaments; Semiautomatic extraction; Digital Elevation Models; Spatial analysis; Northern Andes; Panamá-Chocó Arc.

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