On October 10, the reporter learned from the 23rd Institute of the second Academy of Aerospace Science and industry of China that the first batch of 1:2000 scale radar mapping data drawn by the surveying and mapping team of the Institute in Guizhou has been published recently. The first surveying and Mapping Institute of Guizhou Province, the user unit of the project, said that the data would help solve the problems of large-scale and large-scale surveying and mapping data in Southwest China, and help the rapid economic and social development. < p > < p > for a long time, Southwest China’s Yunnan, Guizhou, Sichuan and other southwest regions have been cloudy and foggy all the year round, especially in the mountainous and forest areas of Guizhou Province, the annual optical mapping time window is short, resulting in the low efficiency and difficulty of optical remote sensing mapping in Guizhou Province, and the conventional optical means can not complete the surveying and mapping tasks on time. In recent ten years, Guizhou’s modernization construction is fast. It is urgent to obtain remote sensing data which can effectively overcome the complex topography and meteorological conditions, and solve the problem of obtaining large-scale high-resolution remote sensing data regularly, quickly and timely. < / P > < p > 23 the millimeter wave interferometric SAR (synthetic aperture radar) mapping system developed by the Institute has many capabilities that conventional radars do not have, such as long-distance all-weather imaging, high-resolution, automatic target recognition, penetrating the jungle, on-board processing and so on, and can realize the fine classification of ground objects. The data obtained regularly can observe the trend and summarize the rules. Compared with the optical equipment, it is not affected by the weather and can work in the day and night. It can be used as an effective surveying and mapping equipment for the southwest and other areas where traditional optical mapping is difficult. < p > < p > in early January 2020, 23 surveying and mapping teams overcame the adverse effects of flight restrictions and limited shutdown time window, and completed the first acquisition of high-resolution interferometric SAR observation data of 500 m aperture spherical radio telescope (fast), which was the first time that airborne millimeter wave radar system was used to carry out high-resolution aerial mapping on fast at home and abroad. < / P > < p > in order to verify the production capacity of large-scale radar surveying and mapping data, the team conducted 1:2000 aerial mapping test within 7500 square kilometers from Gui’an new area to Huishui demonstration area in Guizhou Province, and obtained the first 1:2000 scale radar mapping data in China. Compared with the first 1:5000 scale surveying and mapping data obtained by the team in 2018, the 1:2000 scale is more precise, and has different significance for engineering and large-scale observation. After 12 years, “world class Super project” Shantou Bay Tunnel ushers in a historic breakthrough today