Abstract
As one of the important research fields in the land use or in the LUCC,the expansion of the urban land use is one of the significant indexes to evaluate the urbanization level of a city.Based on the related multi-temporal and multi-source spatial data,this paper conducts a research on the expansion modes and spatial-temporal variations of the urban land use in Mianyang City,one of the science cities in Southwest China.It analyzes the expansion speed coefficient,the expansion intensity index,the compactness,the fractal dimension,the barycenter index,the extending orientation and direction index with the methods of the RS thematic information extraction and GIS spatial overlay analysis.The result shows that the land use in Mianyang City in the last 30 years has increased to 110.11 km2,or 3.8 km2 per year.The average expansion intensity is 0.65.The extending direction of space differentiation is obvious,which can be described as Y mode with a center and three axes.And the expansion mode indicates a transformation from extensive expansion to intensive expansion.
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