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Application of open‐source photogrammetric software MicMac for monitoring surface deformation in laboratory models

2016; Wiley; Volume: 121; Issue: 4 Linguagem: Inglês

10.1002/2015jb012564

2169-9356

Olivier Galland, Håvard Svanes Bertelsen, Frank Guldstrand, Luc Girod, Rikke Færøvik Johannessen, Fanny Bjugger, Steffi Burchardt, Karen Mair,

Remote Sensing and LiDAR Applications

Abstract Quantifying deformation is essential in modern laboratory models of geological systems. This paper presents a new laboratory monitoring method through the implementation of the open‐source software MicMac, which efficiently implements photogrammetry in Structure‐from‐Motion algorithms. Critical evaluation is provided using results from two example laboratory geodesy scenarios: magma emplacement and strike‐slip faulting. MicMac automatically processes images from synchronized cameras to compute time series of digital elevation models (DEMs) and orthorectified images of model surfaces. MicMac also implements digital image correlation to produce high‐resolution displacements maps. The resolution of DEMs and displacement maps corresponds to the pixel size of the processed images. Using 24 MP cameras, the precision of DEMs and displacements is ~0.05 mm on a 40 × 40 cm surface. Processing displacement maps with Matlab® scripts allows automatic fracture mapping on the monitored surfaces. MicMac also offers the possibility to integrate 3‐D models of excavated structures with the corresponding surface deformation data. The high resolution and high precision of MicMac results and the ability to generate virtual 3‐D models of complex structures make it a very promising tool for quantitative monitoring in laboratory models of geological systems.