Applications in urban remote sensing work

Since the 1980s, many large and medium-sized cities in my country have carried out remote sensing survey and research work, and a new discipline "urban remote sensing" has gradually been formed. Beijing, Tianjin, Guangzhou, Shanghai, Shenyang, Wuhan and other cities have successively carried out similar work. Some important cities along the coast and rivers are carrying out investigation and research work that combines aerial remote sensing with aerospace remote sensing. Their common characteristics are: for the construction of each city Carry out work on problems existing in development, such as urban air pollution, water pollution, environmental quality, urban transportation, urban land use and planning, etc. Taking the comprehensive survey application of aerial remote sensing in Beijing as an example, the brief description is as follows:

Urban remote sensing in Beijing began in 1983, and many types of aerial flights were carried out within the planned urban area of ??980 square kilometers, such as ① 1:18000 color infrared aerial photography, which can be used for calculation and interpretation of urban green space coverage and the vegetation effect of air pollution (enlarged to 1:5000-1:2000); ② 1:10000 natural color aerial photography, mainly for agriculture and forestry and water pollution applications; ③1:5000 black and white aerial photos are flown specifically for traffic flow research. The aerial photography time is selected during the morning rush hour with heavy traffic (7:30-8:30); ④1:16000 aerial thermal infrared scanning flight, mainly used for thermal pollution of water bodies, investigation of urban thermal fields in winter, and heat leakage in factories and buildings. Investigation and other applications. ***There are 41 topics, including 11 aspects, many of which are very distinctive, such as the study of the Great Wall in Beijing, the survey of urban thermal fields in Beijing, the survey of solid waste in Beijing, the survey of pollution source chimneys in Beijing, the survey of Beijing traffic flow, Beijing A survey of the city's development from 1953 to 1959, 1983, and a survey of the impact of air pollution on vegetation in Beijing. Topics related to urban geological environment include: research on urban foundation stability and geological structure in Beijing, Quaternary and ancient river sedimentation in Beijing, glacial landforms in Beijing, debris flows in Beijing, building materials and mineral resources in Beijing, etc. Each has its own characteristics, detailed content, and rich information. Many results are obtained for the first time and can be used as a reference for many future urban remote sensing work in my country.