Structure from Motion Arrowsmith, Nissen, Saripalli http://robotics.asu.edu/ Littlerock Motorized kite (watch out for the wind!) $600 for kite Main differences are datum offset (~30 m) and positioning (using camera GPS) SFM-B4 Mulitview stereo and structure from motion applied to volcanic bomb, coastal cliff erosion, volcano caldera Structure From Motion Procedure Structure from Motion • Calibrate Camera (“performed with the same images”) • Take pictures which have some overlap • Find points which are same in both images • Determine how these points have changed between images • Create a Digital Surface Model and 'drape' the images over the model (Texture Map) • Software = AGISOFT PHOTOSCAN (<$3500) Unmanned Aerial Vehicles also kites, balloons Structure from motion using balloon aerial photography with Sri Saripalli $500 balloon plus gear Lofting on He balloon Canon camera with GPS tagging and 2 second interval shooting Can lift a few kg Solve for 6 camera positions (examples) Example 6 image DEM =16 pixels / m = ~25 cm dem Structure from motion orthophoto texturemap (also can generate <10 cm DEM) Click to start video