Fig. 1
From: Methods for quantitative studies of seafloor hydrothermal systems using 3D visual reconstructions
Illustration of the 3D visual mapping method. While the underwater vehicle moves forward, the sheet laser scans the seafloor and a camera takes images of the laser line projection, from which a high resolution bathymetry map can be generated. Flashed images are taken at a lower frequency, but frequent enough to cover the same area with some overlap between the photos, from which the colour can be mapped to the bathymetry