“…Remote sensing has proven to be a valuable source of information for the mapping of natural hazards and disasters (Joyce et al, 2009). Applications include the aftermath of single events, such as floods (Klemas, 2015), landslides (Scaioni et al, 2014) or earthquakes (Tronin, 2006), and the long-term monitoring of continuous phenomena, such as tectonic or geomorphologic movement (Alvan & Azad, 2011), air pollution (Martin, 2008) or ecosystem degradation (Xie et al, 2008) The possibility of accessing large image archives is especially helpful for the assessment of changes over long time periods. In this context, the temporal resolution of a sensor can become more important than its spatial resolution, because it allows both the clear identification of the date of occurrence of an event and the detailed monitoring of subtle changes (Lazecky et al, 2017;Gernhardt & Bamler, 2012) Earth observation (EO) using multi-spectral imagery is often constrained by cloud cover and shadows (Wulder et al, 2008;Giles, 2001;Pearce, 1985).…”