Digital elevation models (DEMs) and ortho-mosaic imagery derived from uncrewed aerial vehicle (UAV) images over Point 660 in Southwest Greenland (67.16 N, 49.99 W)

• Main Author: Sasha Leidman
• Format: Dataset
• Language: unknown
• Published: Arctic Data Center
• Subjects: Greenland Ice Sheet; UAV; Supraglacial Streams; Drone; Digital Elevation Model; Structure from Motion; Ablation Zone; Center Point; Greenland; Kangerlussuaq; Ice Sheet
• Online Access: https://doi.org/10.18739/A2RN3087N

This dataset is associated with the article "Supraglacial Stream Sediment Variability on the Greenland Ice Sheet Over the 2019 Melt Season" submitted to the journal Remote Sensing of the Environment. The dataset includes digital elevation models (DEMs) and orthomosaic images of the Greenland Ice Sheet (spatial extent: 67.155 - 67.165 N, 49.986-50.000 W). DEMs and Orthomosaic images were produced from image collected with an 18-megapixel FC3610 camera mounted on a DJI Phantom 3 quadcopter UAV (July 22-August 11, 2019) or a 17-megapixel L1D-20c camera mounted on a Mavic 2 Pro quadcopter UAV (August 14-15, 2019). Images from the UAV were analyzed in Agisoft Metashape Pro v1.6.5, a Structure-from-Motion software program. High quality dense point clouds were georeferenced to the UTM (Universal Transverse Mercator) 22N projection using markers placed around the study site including orange plastic trays (0.35 x 0.25 meter (m)), orange panted rocks (~0.1 m diameter), and red tarps with black X's to demark the center point (1.5 x 1.5 m). Ground control point markers were geolocated using a UNAVCO Trimble R7 GNSS running in PPK (Post-Processed Kinematic) and corrected using a base station located ~2 kilometers (km) away on bedrock on the ice edge. DEMs and Orthomosaics were exported using the maximum resolution (0.003 - 0.013 m resolution). All images were collected within 2 hours of solar noon. Images were used to digitize the location of supraglacial stream shorelines within the catchment area and to analyze the distribution of sediment throughout the melt season to determine if changes in supraglacial streamflow effected sediment deposition and the absorption of solar radiation.