2Urban Remote Sensing and Urban Studies
2.1Characteristics of Urban Remote Sensing
In accordance with analysis from the United Nations Population Fund (UNFPA), more than half of the world’s population now lives in towns and cities, and it is estimated that this number will swell to about 5 billion by 2030 (https://www.unfpa.org/urbanization). Since a city is a complex system composed of many of natural and artificial elements with a functional integrated ecosystem and socioeconomic system, rapid urbanization not only brings huge social, economic, and environmental transformations, resulting in well-being, resource efficiency, and economic growth, but also brings huge new environmental, ecosystem, and socioeconomic problems (Bloom et al. ...
