Photogrammetry is the science of getting precise measurements and three-dimensional data from at least two photographs. This technique can be applied to construct a 3D model of any scene from any source of image, from standard digital cameras to cameras on Earth-orbiting satellites. The 3D models can be analysed to store information on size, volume, shape and morphology of the surveyed areas. <br /> <br />These models were made during the 2016 edition of ESA’s underground astronaut training course CAVES – Cooperative Adventure for Valuing and Exercising human behaviour and performance Skills. <br /> <br />Photogrammetry could be used by astronauts on the surface of other planets, or even underground such as in the lava tubes of Mars for scientists on Earth. <br /> <br />Follow the underground adventure on Twitter with via @ESA_CAVES, and on the CAVES blog: http://blogs.esa.int/caves.
