Jiayao Wang is Academician of the Chinese Academy of Engineering, Professor of Henan University, President of Henan Spatio-Temporal Big Data Industry Technology Research Institute, Managing Director of China Society of Surveying and Mapping and Director of border and sea map working group. He has been engaged in cartography theory, cartographic generalization, geographic information system, space-time big data and smart city theory and method research for a long time. He has published more than 200 academic papers and 16 books and won the title of national excellent scientific and technological workers and the major contribution award of professional technology of the whole army. Fang Wu is Professor, School of Surveying and Mapping, Information Engineering University. Her research interests are map generalization, map data updating and spatial big data mining. She published more than 200 academic papers and 10 academic books.