Study On Accessibility Of Park Green Space In Built-up Area Of Lu'an City Based On GIS

This paper takes the built-up area of Lu'an City,Anhui Province as the research object,obtains the park green space vector data through remote sensing image sketching,and conducts field investigation and verification data.Based on Excel and ArcMap software,analyzes the current situation of regional streets,population and park green space.The three methods of buffer analysis,minimum proximity distance analysis and distance cost analysis in ArcMap are used to process and analyze,in order to more comprehensively study the accessibility of park green space and the convenience of residents' travel in the built-up area of Lu'an City.The problem of the results of the accessibility analysis of the park green space is presented,and a certain optimization strategy is proposed.The results are as follows:(1)The population density of the built-up area is decreasing from the central city to the periphery.The spatial layout of the park green space presents "one ring,two belts,and multiple green centers".The plaques are concentrated in the central and western regions,and the eastern regions are scarce.The corridors are north-south,and the east and west are separated,and the system is incomplete.The green area of each street park and the area of per capita park green space of each street are very different.(2)Based on the results of the travel cost method,under the pedestrian traffic mode,the area of the park green space within 4 minutes accounts for 47.01%of the total area of the built-up area,up to the population of 56.44%;99.92%of the people can be at 20 minutes.Walk within walking distance to the nearest park green.The areas with good accessibility are mainly distributed in Pingqiao Township,Gulou Street and Zhongshi Street,and the worst are Wangcheng Street and Qingshuihe Street.Under the non-motorized mode of transportation,the reachable area within 4 minutes accounted for 59.43%,and the reachable number was 70.61%;the entire built-up area was accessible within 18 minutes.The areas with good accessibility are mainly distributed in Pingqiao Township,Gulou Street and Zhongshi Street;the poor are mainly distributed in Qingshuihe Street,East of Dongshi Street and Wangcheng Street.Under the motor vehicle transportation mode,the reachable area within 4 minutes accounted for 72.11%,and the reachable number was 80.64%.The areas with poor accessibility are mainly distributed in Qingshuihe Street,Dongshi Street and Wangcheng Street.(3)The results of the convenience analysis of the residents of each street can be obtained:based on the travel cost method,under the pedestrian traffic mode,the average time of the park green space is only 4 minutes in Gulou Street,the area accounts for 1.69%,and the east city street has the most accessibility.Poor,the reachable time is greater than 10min.Under the non-motorized mode of transportation,the average time to reach within 4 minutes is also Gulou Street,accounting for 1.69%;23.59%of the reachable area is more than 8min,which is Dongshi Street and Qingshuihe Street.Under the mode of transportation of motor vehicles,the average time of arrival is within 4 minutes,and there are two streets with good reach,namely Gulou Street and Zhongshi Street,accounting for 6.74%.(4)According to the previous analysis,the uneven distribution of park green space in the built-up area of Lu'an City and the lack of accessibility of the edge area of the built-up area,etc.put forward specific optimization objectives and optimization strategies.Compared with the current situation,the area of park green space after optimization has increased by 107.19hm2,and the number has increased by 28,with a total area of 928.06hm2.The increased park green space is mainly distributed in the areas where the park green space is less distributed,such as Xishi Street,Dongshi Street,Qingshuihe Street and Economic Development Zone.