Each of the two surveys required 26 separate scan locations over three days. A single Scanstation 2 Leica Terrestrial Laser Scanner was used to survey the basin, along with seven Leica high definition targets. A "leapfrogging" technique was used to create an additional 3 targets by moving targets which were not visible from the top of the basin out of the lower channel sections and into the upper basin. This technique requires acquiring the all visible targets twice; once from their old location in the lower channel sections, and one time in their new positions. We commonly use this technique when line of sight is not available from a scan location to the entire space we would like to survey. In this case, trees in the lower channel sections blocked our view of the upper-basin sections so we "leapfrogged" three targets, reducing our error budget (by better distributing targets within the point cloud) and increasing the redundancy of targets throughout the basin. The two surveys were referenced using the monument technique, which is detailed on the GAP fire page.
_This material is based upon work supported by the National Science Foundation (NSF) under Grant No. 0934131, entitled “Geomorphic Connectivity in a Recently Burned Watershed” - Thad Wasklewicz, PI