Video S1. Timelapse video of eroding permafrost coastline on Qikiqtaruk - Herschel Island, Yukon, Canada between 2017-07-29 and 2017-08-03. The camera was situated at 69.570553°N, -138.880706°E, facing west by southwest towards the Pauline Cove settlement, and aquired an image every hour. This video is a supplimentary file to the research paper "Rapid retreat of permafrost coastline observed with aerial drone photogrammetry", submitted for publication in The Cryosphere (doi.org/10.5194/tc-2018-234).