Figure 1

(a) Elevation map of North Korea, with Sentinel-1 satellite coverage and approximate location of the Musan mining area (red box) and (b) optical imagery of the Musan mining area from Planet Labs and processed using QGIS ver 3.22.

(a) Elevation map of North Korea, with Sentinel-1 satellite coverage and approximate location of the Musan mining area (red box) and (b) optical imagery of the Musan mining area from Planet Labs and processed using QGIS ver 3.22.