SfM appears to be a great, cost-effective, means of 3D reef mapping and your article nicely outlines the process, but you fail to cite a recent article that has already applied it to coral reefs (Leon, JX, Roelfsema, CM, Saunders, MI, Phinn, SR. 2015. Measuring coral reef terrain roughness using 'Structure-from-Motion' close-range photogrammetry. Geomorphology 242:21-28, DOI:10.1016/j.geomorph.201...