My background is in geology and mineralogy, specialising in applied mineralogy and optical crystallography. I was a lecturer at Aalto University [in Finland] teaching engineering geology. One topic I covered with my students was mapping rock structures in excavated tunnels. This was a hostile environment to work in, as boulders could have fallen from the tunnel walls at any time. For that reason, I decided to use stereo photogrammetry, a mapping technique that works rather well. It requires using stereo image barriers from the rock walls, but later you can go back to your office (a safe environment) to map the 3D structures.
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