Based on the same data source of Landsat TM/ETM+ in 1990s, 2000s and 2010s, all urban built-up areas in China are mapped
mainly by human interpretation. Mapping results were checked and refined by the same analyst with the same set of criteria. The
results show during the last 20 years urban areas in China have increased exponentially more than 2 times. The greatest area of
urbanization changed from Northeastern provinces in 1990s to the Southeast coast of China in Jiangsu, Guangdong, Shandong,
and Zhejiang in 2010s. Urban areas are mostly converted from croplands in China. Approximately 17750 km2
croplands were
converted into urban lands. Furthermore, the conversion from 2000 to 2010 doubled that from 1990 to 2000. During the 20 years,
the most urbanized provinces are Jiangsu, Guangdong, Shandong and Zhejiang. We also analyzed built-up areas, gross domestic
production (GDP) and population of 147 cities with a population of greater than 500000 in 2009. The result shows coastal cities
and resource-based cities are with high economic efficiency per unit of built-up areas, resource-based cities have the highest population
density, and the economic efficiency of most coastal provinces are lower than central provinces and Guangdong. The
newly created urban expansion dataset is useful in many fields including trend analysis of urbanization in China; simulation of
urban development dynamics; analysis of the relationship among urbanization, population growth and migration; studies of carbon
emissions and climate change; adaptation of climate change; as well as land use and urban planning and management.