Structure from Motion

Arrowsmith, Nissen, Saripalli

http://robotics.asu.edu/

Littlerock Motorized kite (watch out for the wind!)

$600 for kite

SFM-B4difference

Main differences are datum offset (~30 m) and positioning (using camera GPS)

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)

=16 pixels / m = ~25 cm dem

Example 6 image DEM

Structure from motion orthophoto texturemap (also can generate <10 cm DEM)

Click to start video