Research On The Evolution Of "Sansheng Space" Identificationand Spatial-temporal Pattern Based On POI Data

The "National Territory Planning Outline(2016-2030)" was put forward in 2017,which confirmed the important position of Sansheng Space,so Sansheng Space became a hot spot of academic research.Therefore,its research content and research methods are constantly innovating,and the continuous development of big data technology provides a richer and more comprehensive technical environment for 3SBio research.Although research based on POI data has become a trend,it is still a relatively cuttingedge research in POI identification of tertiary spaces.Based on my research interest in spatial identification in Hefei and the need to deepen the related academic content,this paper innovates the research content and methods on the basis of the previous research,and uses POI data for spatial identification and evolution analysis.This paper focuses on the theoretical and methodological research on the division of the "three-life space" at the urban level,and attempts to study the distribution pattern of the functional areas of the "three-life space" of ecology,living and production at the macro-city level.First of all,through discussions with experts and reference to relevant literature,the author initially established a POI three-class classification system,and classified and screened the obtained POI raw data.Then,the analytic hierarchy process model of POI three-generation classification was created,and it was given to 20 experts for scoring,and the functional weight of POI was obtained.Referring to Shi Jiefeng,he introduced the concept of area weight.The POI area range is estimated by referring to the specification,and the POI area weight is obtained by scoring.Finally,it is relatively appropriate to set up a variety of ratio control experiments to obtain a 1:1 configuration of area weight and function weight.Then the author calculates the three-generation function value in the unit grid through the formula,and uses the division standard to characterize the grid.In the end,the author identified the POI three-generation space zoning map in 2010,2015 and 2020,and preliminarily concluded that the proportion and area of living space increased from 2010 to 2020,and the proportion of production space increased and decreased.,the ecological space is basically stable but has a small increase.On the basis of the above-mentioned partition data,the author conducts experiments on spatial transition matrix,kernel density,standard deviation ellipse,and Moran index analysis.The purpose of constructing a space transition matrix is to visualize the process of space evolution,and to be able to visually observe where the living space has increased a lot,where the production space has decreased a lot,and what type of space they were originally transformed from.The results of the spatial transfer matrix analysis showed that the living space in the west of Shushan District outside the Second Ring Road,the south of Baohe District,and the northeast of Yaohai District increased substantially,the production space in the central and western parts of Shushan District and the northern part of Yaohai District increased slightly,and the inner and outer areas of the Second Ring Road and the Economic Development Zone increased slightly.The mixed space of the district and Yaohai district increased.The analysis of kernel density,standard deviation ellipse,and Moran index is to study the spatial pattern change characteristics of the urban area of Hefei City,including agglomeration characteristics,morphological characteristics,and autocorrelation(location)characteristics.The final results are as follows:(1)Its living space agglomeration and evolution The characteristic is that it gradually evolves into a four-axis layout with the inner part of the second ring as the core;the evolution characteristic of production space agglomeration is to evolve into a circular multi-core distribution pattern;the evolution characteristic of ecological space agglomeration is point-like distribution.(2)The morphological evolution of the overall space is characterized by the living space,production space,and mixed space all distributed and continuously spreading toward the Yaohai-Luyang axis,while the ecological space is distributed and slightly reduced toward the Luyang-Baohe axis.(3)The evolution of autocorrelation is characterized as follows: with the increase of living space,the correlation degree of living space decreases;the concentration and outward movement of production space increases the correlation and agglomeration degree of production space;the correlation degree of ecological space is low.Finally,according to the local analysis results,macro strategies are put forward to give full play to the advantages of production and life in the old city,the production advantages of the economic development zone and the high-tech zone,and the ecological advantages of Sanshigang Township and Jinggang Town,so that the regional three-life space can develop in a balanced manner.