00000nam 2200000zi 4500 9.893906 CaOODSP 20221107173601 m o d f cr mn||||||||| 201123t20202020oncab ob f000 0 eng d CaOODSP eng rda CaOODSP n-cn-nt M103-3/54-2020E-PDF Fraser, Robert H., author. Testing the potential of UAV photogrammetry for deriving bare earth models in Arctic shrublands / R.H. Fraser, T.C. Lantz, M. McFarlane-Winchester, J. van der Sluijs, and C. Prévost. [Ottawa] : Geomatics Canada, 2020. ©2020 1 online resource (20 pages) : illustrations (some colour), colour map. text txt rdacontent computer c rdamedia online resource cr rdacarrier Open file ; 54 Includes bibliographical references (pages 18-20). "We conducted an experiment to test the potential of UAV-based surveying and photogrammetry to delineate a "bare earth" surface or digital terrain model (DTM) in dense Arctic shrublands. High overlap (86%/80%) UAV photo surveys captured at two resolutions (5.5 mm and 22 mm) were processed into dense point clouds using a conventional structure from motion workflow. DTMs were derived from the point clouds by triangulating the lowest points within 1 meter windows and resampling to a 1 cm raster grid. Mean absolute vertical error of the DTM, assessed using 90 ground elevations surveyed in the field, was 5.4 cm for the 5.5 mm survey and 8.3 cm for the 22 mm survey. Larger errors for the coarser 22 mm survey were due to poorer point cloud modeling of ground surface features within the gaps of denser shrub canopy"--Summary, page 5. Drone aircraft in remote sensing Northwest Territories. Digital elevation models Northwest Territories. Télédétection par drone Territoires du Nord-Ouest. Modèles numériques de terrain Territoires du Nord-Ouest. Geomatics Canada, issuing body. Open file (Geomatics Canada) 54. (CaOODSP)9.821474 PDF 41.15 MB https://publications.gc.ca/collections/collection_2020/rncan-nrcan/m103-3/M103-3-54-2020-eng.pdf 321447