Abstract:

Since reform and opening in 1978, southern Jiangsu Province has undergone rapid economic, industrial development and urban expansion. However, what is the spatial and temporal dynamics of construction land from 1980 to 2010? How to distinguishthe types of construction land expansion is important to understand the morphology of urban expansion. Landsat 5 TM imageries within 2010 covering the south of Jiangsu Province were selected and classified for land use with overall accuracy and Kappa coefficient 87.5% and 0.82 respectively, and seven land use types, specifically, woodland, grassland, farmland, wetland, water body, construction land and unused land were considered. The land use maps in 1980 and 2005 were from Chinese Data Sharing Infrastructure of Earth System Science. The two sources of land use maps were georeferenced. The land use maps in the south of Jiangsu Province from 1980 to 2010 were overlaid by ArcGIS 9.3 software. Then the construction land expansion types of infilling, edgeexpansion and outlaying were recognized and extracted using topology theory in ArcGIS 93 software. Finally, the spatial and temporal dynamics of construction land expansion types and driving factors were further analyzed. The results showed that the area of construction land increased by 44582% in the southern Jiangsu Province from 1980 to 2010, with an increase of 163.73% from 1980 to 2005 and 10696% from 2005 to 2010. The construction land expansion rate of Changzhou was the maximum for the period of 1980-2010 with 75286%. The major construction land expansion type in the south of Jiangsu Province was the edgeexpansion type, which occupied approximately 7403% from 1980 to 2010, and the followed were outlaying and infilling types, which owned the area of 41765 km2 and 11759 km2 for the period of 1980-2005. The percentages of construction land expansion types were similar as the period of 1980-2005 but changed dramatically for the period of 2005-2010. From the spatial distribution analysis of construction land expansion types in the south of Jiangsu Province, the infilling type was mainly located in the area nearby the city center in the five cities, while the outlaying type was mainly located in the area far away from the city center. The patch numbers of construction land expansion types were increasing from 1980 to 2010. The shapes of three construction land expansion types became increasingly complicated because of the increasing landscape shape indices for the period of 1980-2010. The fragmentation of three construction land expansion types was more serious due to higher split index. However, they still kept the higher connectivity with the high COHESION values. Construction land expansion in the south of Jiangsu Province had the close relationship with economic rapid development, population booming, industrialization, real estate investment, foreign direct investment and fixed assets investment. The method to distinguish the construction land expansion types based on GIS and remote sensing was a convenient approach in the different regions, especially the developing countries without enough urban monitoring, planning and management datasets