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Spatial Trends of Urbanization of China's Major Cities Using Remote Sensing Data

机译：遥感数据在中国主要城市的城市化空间趋势

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During the last two decades, China has been experiencing astonishingly intensive urbanization process, in terms of both urban population boost and urban area expansion. In this process, urban sprawl is the most adopted urbanization form of the majority of China's major cities, which caused severe encroachment of arable lands and urban environmental problems as well. With the huge population, the per capita area of arable lands of China is far below the world average, and land resource becomes highly limited and essential in this developing country. Therefore, the land developing mode of urban sprawl should be replaced by the paradigm of compact city in China, especially for its big cities that are in large demand of land resources. This research evaluated spatial trends of land development of China's 32 provincial capital cities from the year 2000 to 2010, using remotely sensed image data, in order to investigate whether China has slowed down its pace of urban land-use expansion and shown emphasis on infill development of existed urban centers. As the census data of China's built-up urban areas are not either consistent or unreliable, and land-use maps are unavailable for the year 2010, Landsat TM image data were used to extract built-up areas of provincial capital cities, and change detection were implemented to reveal urban land-use expansion. As to investigation of infill land development trends, nighttime DMSP/OLS image data were utilized. The change of light intensity on DMSP/OLS data of different time could be used to reflect the trends of infill development intensity of urban areas. Results showed that urban sprawl still acted as the major way of urban land development. However, infill development intensity increased during the decade.
机译：在过去的二十年中，无论是在城市人口增长还是城市扩张方面，中国都在经历着惊人的集约化城市化进程。在这个过程中，城市扩张是中国大多数大城市中最被广泛采用的城市化形式，这导致了耕地的严重侵占和城市环境问题。由于人口众多，中国的人均耕地面积远远低于世界平均水平，土地资源变得高度有限，在这个发展中国家是必不可少的。因此，城市扩张的土地开发模式应被中国的紧凑型城市模式所取代，特别是对于土地资源需求大的大城市。这项研究使用遥感图像数据评估了2000年至2010年中国32个省会城市土地开发的空间趋势，以调查中国是否放慢了城市土地利用扩张的步伐，并强调了填充发展现有的城市中心。由于中国城市建成区的人口普查数据不一致或不可靠，并且无法获得2010年的土地利用图，因此使用Landsat TM图像数据提取省会城市的建成区并进行变化检测实施以揭示城市土地用途的扩展。关于填充土地发展趋势的调查，利用了夜间DMSP / OLS图像数据。 DMSP / OLS数据在不同时间的光强变化可以反映城市填充物发展强度的变化趋势。结果表明，城市扩张仍然是城市土地开发的主要方式。然而，在这十年中，填充物的开发强度增加了。

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