Photogrammetry Posted in V2 Things: Instruments & Tools on May 1, 2009 by Susan Cobb. These are the pair of Nikon D300/5mm precision GPS units that will be sued to shoot stereo photogrammetry of storm updrafts for VORTEX2. One of the additional GPS units that will be in the field of view of the photographs, providing additional GPS precision. Credit: Greg Stumpf They are used to map the 3D updraft structure, and will be maneuvered by teams operating on a 60 degree baseline – usually 3-8 miles apart. The cameras shoot photos at 5 second intervals. Credit: Greg Stumpf Mike is frustrated. We drove all this way to watch a supercell completely disintegrate! And we learned that we need to be a lot faster at setting up the gear. Credit: Greg Stumpf Viewfinder view. Note the other precision GPS unit on the pole in the field of view. Credit: Greg Stumpf Nolan Atkins, Lyndon State College takes a panorama of still photos to document their location. The photogrammetry team co-locates with a mobile radar to compare their photographs with what is detected by radar.