Dynamic Change And Space Analysis Of Urban System In Jilin Province Based On Remote Sensing And GIS

With acceleration of urbanization progress,the emergence of issues of urban construction, infrastructure construction,resource development and environmental protection,also with lateral and longitudinal strengthen between cities,it is an urgent to strengthen the urban planning and urban management technology and method.Research of urban system mainly studies urban groups in a certain region,it is an important direction of urban geography research,also one of the main elements of regional development studies,regional planning and land development and planning.As complex dynamical systems,urban system is characterized by the "three-structure and one network"(scale structure,functional structure,spatial structure,network characteristics) in the basic theory.This paper mainly studied urban infrastructure system theory and analysis of spatial and temporal evolution by remote sensing,GIS technology,aimed to provide objective,scientific supports for the planning and monitoring of provincial cities and towns.The main contents of this paper include the following:(1) Urban built-up areas extraction by Remote sensingBy object-oriented remote sensing classification technology,the study extracted urban built-up area from images.Classification strategies of built-up area extraction in Jilin province were drawn under the statistics of spectrum and texture based on TM with 30 meter resolution and ETM with 15 meter resolution.It can be found that villages around cities and towns had an impact built-up area extraction,by an analysis of differences in classification and visual interpretation results.Compared building in the border of built-up area and surrounding villages,high buildings can be extracted from CBERS image with 2.36 meter resolution by the shadow of building.(2) Spatial Analysis of Urban SystemSpatial analysis of urban system is extended by structure of this theory of urban system.In terms of scale structure,the study showed that the quadratic polynomial model fit best between non-agricultural population and urban land in three periods,1997,2001,2008;proposed model of urban scale division by urban land.We can draw after rank analyse of urban land in 1997 in Jilin province that urban land accords with rank-scale rule,the correlation coefficient reached more than 0.9,urban scale can be divided by cluster analysis of urban land.In the study of urban levels,the paper discussed methods of calculating factor in the level model of urban system,proposed transportation convenient model and estimated degree of transportation convenient for 27 cities in Jilin province by network analysis and by 1:1 million scale transportation data,Changchun city was with the highest degree of transportation convenient to 9.1;In terms of spatial structure,the spatial structure can be divided into three parts:distribution function of urban,pattern index and spatial shape index.By the 1:1 million scale data,the study achieved estimation and analyse of spatial indicators in Jilin Province;(3) Space-time evolution of urban systemStudy on Space-time evolution of urban system included characteristics and laws of evolution based in scale structure and spatial structure.In terms of spatial structure evolution,the study determined the scale of urban land by statistical analysis in Jilin on three periods scale-division(1980,1997,2001 year).The threshold of urban scale divided into 8,20,80,120 sq km,combined with urbanization and development of Jilin province,we can analyse the changes of urban scale.By contrast,urban land scale division can reflect more information then non-agriculture population scale division in Jilin province;It can be found that the distribution center move slowly toward Changchun City,by calcuting the distribution center in the year 1994,1999,2995 and 2008 with weighted by non-agriculture population.Fractal dimension of urban in whole province can be estimated by the relationship of order-scale rule and fractal dimension.By the examples of 1980,1997 and 2001,the results showed that fractal dimension was with slowly increasing trend,but with lower the overall number and low complexity;By calculating urbanization intensity index of 45 cities in Jilin province in 1980 and 1997, the results showed that the central region of urbanization intensity index was more than the eastern, western.By study the relastionship of scale structure evolution and spatial structure evolution of urban system in Jilin province,both of them showed the characteristics in Jilin province,that is,primary city with polarization phenomenon,also urban system in Jilin province with low complexity and stability.