Xu Wenxiang, director of the China Center for Resources Satellite Data and Application, introduces the data processing of the Gaofen-7 Earth observation satellite during the launching ceremony of its first batch of three-dimensional images in Beijing, capital of China, Dec. 10, 2019. The China National Space Administration Tuesday released the first batch of three-dimensional images based on the data from the recently launched Gaofen-7 Earth observation satellite. (Xinhua/Shen Bohan)