Urban Green Space Pattern And Service Function Analysis In Wumen Mountain Area Based On Remote Sensing Technology Of Unmanned Aerial Vehicles

As the process of urban sprawl accelerates,urbanization leads to urban land shortage and many environmental problems arise.Therefore,building an ecological and civilized city has become an important task.The western development policy has achieved remarkable results in the southwestern region.The development of small and medium-sized mountainous cities in the region has accelerated,but the quality of urban green space construction is not good enough,the number of green spaces is insufficient,and the layout is also unreasonable.The green space conditions of small and medium-sized mountainous cities are rarely taken seriously,and people are easily misled by common sense: mountainous cities are surrounded by mountains,and the urban environment is of good quality,but the importance of artificially planted green spaces and garden cities is neglected.This paper is located in eight typical small and medium-sized mountain cities in Bijie City,Wumeng Mountain: Qixingguan District,Jinhai Lake New District,Dafang County,Jinsha County,Luxi County,Zhijin County,Nayong County,Hezhang County.For the scope of research,the green space data was obtained by UAV remote sensing technology and GIS,and the green space classification and database establishment were carried out according to the green space type classification standard implemented in June 2018,and the green space data under the new standard was used(plaque type,Analysis of area,quantity,distribution)and green space service functions,the following research conclusions were obtained:1.Analysis of the pattern of eight urban green spaces The green area data of the eight urban districts collected are analyzed by greenfields,and the greenbelt types in each urban area are relatively complete,and the regional green space area is the largest,which is 2170.47hm2,which is consistent with the large proportion of natural mountain bodies in mountainous cities.The number of patches in the affiliated green space is the highest,at 37,900.According to the analysis of the middle class,there is a phenomenon that the park green space type is incomplete in all urban areas.The greening area and location distribution pattern of the park in Luxi County are superior,and the green area of the park is 314.92hm2.The construction of the park in Zhijin County needs to improve the quality to a higher degree.Through comprehensive analysis,the construction of the park needs to be improved;the scale of all the squares in the study area does not meet the requirements of emergency shelters;the quality of the auxiliary green space is not improved by the use of three-dimensional greening.From the landscape ecology,the green plaques have a large degree of fragmentation,which can not reach the service value that can be achieved under the area standard.The green coverage rate and green rate of each urban area cannot meet the standards of garden cities.2.Analysis of green space service function Through the analysis of the social service function,the ecological service function and the aesthetic service function of the green space,the actual service radius of each urban area can be calculated by the accessibility method of slope energy consumption: Qixingguan District and Zhijin County are 292 m,Jinhai Lake New District and Hezhang County is 313 meters,Dafang County and Nayong County is 274 meters,and Luxi County and Jinsha County are 253 meters.The actual service blind area is larger than the service service area with a theoretical service radius of 500 m.Considering the actual service radius,the built-up area is considered.The planning park has a large blind area for planning parks in small and medium-sized mountainous cities;the analysis of emergency refuge service functions has not been able to meet the requirements of per capita emergency evacuation of 2m2/person in Zhijin County and Hezhang County,Dafang County,Nayong County and Although Hezhang County reached the standard,the distribution pattern was not good.The research on the cooling function of green space has different types of green space for cooling in various urban areas.The analysis of noise reduction service for road vegetation structure can be concluded that the road noise reduction effect of Jinhai Lake New District is the best,and the vegetation structure of each urban road should be increased.Grass type.The mountainous green space in Qixingguan District has the strongest water conservation capacity,and the water storage capacity exceeds 15000 hm2.There are hidden dangers of geological disasters in various urban areas.Therefore,the importance of protecting mountains should be taken seriously.From the perspective of building a garden city,a comprehensive analysis can be obtained: the green space of eight cities in the study area needs to increase the number of greening and optimize the green space layout.