Gis In Loess Hilly Region-based Urban Construction Land Suitability Evaluation

Along with the accelerating development of our country's urbanization, the conflicts between resources, environment and population become more and more Prominent. When the population of town increases rapidly, the intensity and scope of land-use become larger and larger, the use for city construction land will expand rapidly. So, city constructive land suitability evaluation, which is the basic of urban planning, is pained more attention over the academic field. But most of the evaluations are focus on the cities of plain area, less on the cities of Loss Hilly region. Owing to the different natural features and social attributes of Loss Hilly region, the existing evaluation theory and method can't apply to the city construction in Loss Hilly region.Based on the all above, comprehensively analyzing the related theories and methods of city constructive land suitability evaluation, the paper proposes the city constructive land suitability evaluation model and method based on GIS for the Loss Hilly region. The conclusions are as follows:(1)The suitable theories for land suitability evaluation are these:System Theory, Urban Balance Land-use Theory, Land Rent Theory, Land Price Theory, and Landscape Ecology.(2)The classification systems of city constructive land in Loss Hilly region are three parts: mountain ridge land, river land, channel land.(3)The quantitative methods of the evaluation indexes for city constructive land in Loss Hilly region are Exponentially Weighted Index Method,STC and Delphi.(4)The methods of city constructive land suitability evaluation are integrated evaluation with Extreme Condition Method and Index Sum Method.(5)The city constructive land in Loss Hilly region can be divided into five grades, which are unlimitedⅠ,limitedⅡ, limitedⅢlimited and unsuitable land for construction.