Region 2 in Fig. 1 in Anhur, showing the mouth of the canyon (from images acquired with the orange filter on 25 March 2015 (left) and 10 February 2016 (right). The March 2015 image has a lower spatial resolution (1.7 m px⁻¹) than that obtained in 2016 (1 m px⁻¹), and it is reprojected onto the shape model to match the observing conditions of the February 2016 image. Thus the left- and right-side images have the same spatial scale. Changes are indicated by the red arrows that point to different boulders (B1–B5), while the area with the most significant changes is delineated with red polygons (A1 and A2). Green points and lines indicate some reference landmarks in the images. See the online movie, which shows the morphological changes between these two epochs.