The urban land area Change in China from 1820 to 1999

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According to the length of city perimeter and the administration systems recorded in thehistorical literatures of the Qing Dynasty, a set of methods is developed to convert the historicalrecords into the area of urban land use, by which a set of preliminary estimated urban land use dataof the 18 provinces during the Emperor Jiaqing (1820AD) in the Qing Dynasty, is achieved. Basedon the above achievements, the regional differences of urban land use are analyzed, and the compari-son in urban land use between the Qing Dynasty and present (1999) is made.
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