Fig. 3

a Landsat 321 as RGB overview of the Oasis impact structure with its inner and outer ring as reference (30 m/px). b, c ALOS PALSAR-2 derived data representations (25 m/px). b Polarimetric Pauli decomposition with even-bounce/dihedral rotated/odd-bounce components represented as RGB. c Entropy (H)–alpha (α)–anisotropy (A) decomposition represented as RGB. The center of the impact structure is located at 24°24′E, 24°34′N. d, e H–α-plane scatter plot for the Oasis impact structure (d) and a region covering the Libyan Desert centered at 25°03′N, 21°55′E (e)