Quantitative analysis of folds by means of orthorectified photogrammetric 3D models: a case study from Mt. Catria, Northern Apennines, Italy

Abstract

A 3D model of a plunging meso-scale chevron fold affecting Mesozoic limestone has been generated, scaled and oriented applying a photogrammetrically based workflow. Bedding measurements allowed extracting the statistical direction of intersection between the bedding planes (the fold's β axis), allowing for the orthorectification of the 3D model and the construction of a photo-realistic cross section. The methodology in this contribution constitutes an innovative tool, available to all, for the accurate quantitative analysis of geological structures.