Dr. Li-Yang Xiong is an associate professor at the School of Geography, Nanjing Normal University (NNU), China. He is currently responsible for managing NNU’s research in Digital Terrain Model and Digital Terrain Analysis. His main research interests include loess terrain feature characterization, landform evolution modeling, paleotopography reconstruction and geomorphological process mining. Dr. Xiong obtained his PhD degree in cartography and geographical information system at the School of Geography Science, Nanjing Normal University (NNU), China, and has previously worked at University of Wisconsin-Madison (UWM) as a postdoctoral research fellow.Dr. Guo-An Tang is a professor at the School of Geography, Nanjing Normal University (NNU), China. He is the director of the key laboratory of geographical information science of Jiangsu Province. Dr. Tang is currently responsible for managing NNU’s research in Geographical Information Science (GIS). His main researchinterests include loess landform classification, GIS spatial analysis, geomorphometry and GIS education. Dr. Tang obtained his PhD degree in geographical information science at Salzburg University, Austria.