Evolvement of the Nanjing urban green land based on GIS analysis

Hao Xu

College of Landscape Architecture, Nanjing Forestry University, Nanjing, China

Nanjing is one of the important central cities in the Yangtze River Delta, which goes through dramatic urbanization development in recent 40 years. In this research, green land distribution data in 1966, 1981 and 2004 were extracted from topographic maps, aerial imagery, and so on. Time series analysis has been conducted on the GIS platform; characteristics of the evolution of urban green land from 1966 to 2004 were summarized from the perspective of the scale, function, pattern analysis. The results reveal that an environmental function plays an important role, status of recreational function began to rise, the spatial pattern of green land has a tendency of specialization and complication, the downward of its total size accelerates. Woodland which maintain the basic pattern of the recent 40 years green land system in Nanjing remains stable structure.