PT Journal AU Koch, B Kattenborn, T Fritz, A TI UAV-based photogrammetric point clouds - Tree stem mapping in open stands in comparison to terrestrial laser scanner point clouds SO The international archives of photogrammetry, remote sensing and spatial information sciences PY 2013 BP 141 EP 146 VL 40 DI 10.5194/isprsarchives-xl-1-w2-141-2013 LA english ER