Remote Sensing based multi-temporal observation of North Korea mining activities : A case study of Rakyeon mine

Jeong Hwa Lim, Chungnam National University, Daejeon, Korea, Republic of (South), Jaehyung Yu, Chungnam National University, Daejeon, South Korea, Sang-Mo Koh, Korea Institute of Geoscience and Mineral Resources,, Daejeon, South Korea and Giljae Lee, Korea Institute of Geoscience and Mineral Resources, Daejeon, South Korea