Use of TanDEM-X and Sentinel Products to Derive Gully Activity Maps in Kunene Region (Namibia) Based on Automatic Iterative Random Forest Approach. - Miguel Vallejo Orti; Lukas Winiwarter; Eva Corral-Pazos-de-Provens; Jack G. Williams; Olaf Bubenzer; Bernhard Höfle (IEEE J. Sel. Top. Appl. Earth Obs. Remote. Sens., 2021)