Geologic context of CE-4 landing region and distribution of spectral detection sites. (a) Landing site of CE-4 (red flag). The basemap is from the Lunar Reconnaissance Orbiter Camera (LROC) Wide Angle Camera. The inset in the upper left corner is a digital elevation model; (b) VNIR measurement sites (green dots) along the Yutu-2 rover’s travel path. The Yutu-2 rover has been travelling in the northwest direction from the landing site. The basemap is from the LROC Narrow Angle Camera image.