Global observation of urban expansion and land-cover dynamics using satellite big-data

• 作者: Wenhui Kuang Guoming Du Dengsheng Lu Yinyin Dou Xiaoyong Li Shu Zhang Wenfeng Chi Jinwei Dong Guangsheng Chen Zherui Yin Tao Pan Rafiq Hamdi Yali Hou Chunyang Chen Han Li Chen Miao
• 来源期刊: 科学通报（英文版）
• 年，卷（期）: 2021,（4）
• 所属期刊栏目: NEWS & VIEWS
• 页码范围: 297-300
• 页数: 4页
• 语种: 英文

摘要

Humans deeply influence the urbanizing of earth's surface system in an exacerbating manner across space and time [1].Around the globe, urban land-use/cover changes reflect the intensities of human activities and land shifts from nature or semi-nature lands to man-made-dominated surfaces [2].Urban population in the world is predicted to rise from 55.25％ in 2018 to 68％ in 2050 (https://population.un.org/wup/Publications/).Urban expansion encroaches on high-quality croplands and consequently threatens national food security, which also leads to natural habitat and biodiversity losses in unsustainable ways [3].At the same time,increases of surface imperviousness in urbanized areas alter surface hydrological processes and radiation and energy exchanges between surfaces and the atmosphere, which aggravate rainstorm flood disasters and urban heat islands, respectively [3,4].Therefore,accurate products from Global Urban Land Use/cover Composites with 30-m spatial resolution (GULUC-30), including urban boundaries, impervious surface area (ISA), green space (GS), and water area (WA), are essential to further quantify complex land surface properties and to advance sustainable urban solutions associated with the built environment (Table S1 online).These datasets and detailed analysis reports will be published as a 2020 annual report by Global Ecosystems and Environment Observation Analysis Research Cooperation (http://www.chinageoss.cn/geoarc/en/index.html).