| With the Park city established theory and the beautiful livable urban planning park of chengdu,chengdu and its surrounding county urban development provided to urban public service system,the urban space,urban environment,urban quality of concrete opinions,for subsequent pointed out the core of urban development to grasp.As an important theory in the urban development the swimmer and an important part of urban public service facilities,city park directly influences the space layout of the urban green space and the efficiency of resource allocation and residents,so comprehensive evaluation for urban park space layout will become an important indicator to measure urban park construction level.Therefore,the comprehensive evaluation of the spatial layout of urban parks will become an important indicator to measure the level of park city construction.But at present,the evaluation index of city park for more from the macroscopic Angle of qualitative indicators,such as the rate and service radius much discussion about the "quantity",rarely involves the park vegetation index and the accessibility level such as "quality" of evaluation,so the park green space layout and the accessibility of quantitative research is very necessary.In terms of research methods,this paper belongs to the field of applied research,the intersection of geographic informatics and urban design.The research method is based on space syntax theory.Snap,ENVI,Depth Map and ACRGIS software are used to analyze the spatial layout of urban parks in Xinjin District.According to the analysis results,the existing problems are found and the optimization strategies for the existing park system are put forward.In this paper,the main research results are the following aspects:This paper belongs to the applied research type and is in the cross category of geo informatics and urban design.Therefore,in terms of research methods,spatial syntax theory and quantitative analysis are selected,SNAP,ENVI,DEPTHMAP and ACRGIS software are specifically used,and sentry 2 remote sensing image and relevant spatial information data are taken as the basis.Extraction for Xinjin Distric region normalized vegetation index,the city park green space plaques and city road network layout,according to the internal quality and external two aspects of accessibility of Xinjin Distric region urban park space layout detailed analysis,according to the result of comprehensive evaluation and space layout of the existing problems,systemic Xinjin Distric city park construction optimization scheme is put forward.The main research achievements of this paper include the following contents:Firstly,based on the analysis of park city theory,spatial layout and spatial syntax theory,a comprehensive evaluation model of urban park spatial layout was established.The vegetation cover index,green space shape index,green space area per capita,global accessibility,local accessibility and perceived accessibility were selected to construct a comprehensive evaluation system.Secondly,according to the selection index,the nine selected parks were evaluated and analyzed.ENVI and Depth Map software were used to summarize the normalized index and accessibility of vegetation in each park,and the comprehensive evaluation results of spatial layout of urban parks in Xinjin district were obtained by using polygon comprehensive index method as evaluation model.Thirdly,based on the current situation of Xinjin District,the comprehensive evaluation index of urban parks in Xinjin District is low on the whole,and the spatial layout is unbalanced.The maximum value of the comprehensive evaluation index is 0.5423,and the minimum value is 0.1405.Most parks are graded between 0.25 and 0.5,and the rating is Ⅲ.The difference of vegetation coverage quality of each park was small,which was about 0.6921.The lowest value of green space shape index was 2.05,which was much better than the maximum value of 5.89.There were great differences in accessibility level among urban parks.The maximum value of global accessibility was 1.0256,the minimum value was0.4768,the maximum value of local accessibility was 30.3677,and the minimum value was8.2352.There is a big difference between the indexes of each administrative region.The global accessibility and local accessibility of Wujin Street are the highest（0.9809 and 24.23respectively）,the global accessibility of Puxing Street is the lowest（0.6708）,and the local accessibility of Huaqiao Street is the lowest（8.24）.The current layout of urban parks and the coverage of urban green space are misaligned,the coverage of green space in the north and northwest of the whole region is the best,but urban parks are mostly located in the southeast of Xinjin District.Some administrative areas have good vegetation coverage and high accessibility,but lack of park layoutFourth,based on the research results of this paper,analyze the current situation of park layout,combined with the situation of Xinjin District,the layout of urban parks in Xinjin District is optimized,such as new urban parks to relieve the pressure of park service in the central district;Improve the local road network,improve the accessibility level of the whole park;... |
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