A Research On Spatial Differentiation Of 15-minute Living Circles In Low And Middle-income Residential Areas In Wuhan Based On Multisource Data

On October 18,2017,President Xi Jinping emphasized in the report of the Nineteenth National Congress that the main contradictions in our society have been translated into contradictions between the people’s growing needs for a better life and unbalanced and inadequate development.The low and middle-income settlements,as the main manifestation of the imbalanced and insufficient urban development,deserved the attention of the state and governments at all levels.Although academia has conducted a lot of research on low and middle-income settlements such as urban villages and historical blocks in Wuhan,there are still problems such as unclear analysis of connotation,unclear concept definition,imperfect theoretical framework,and relatively narrow research perspective.Especially since the promulgation of the 《Code for Planning and Design on Urban residential Areas》(GB50180-2018),existing research is difficult to meet the needs of urban construction,and further research is needed.This research follows the logical main line of "theoretical review-relationship building-extract features-analyze reasons ",taking a 15-minute life circle facility service evaluation as an entry point of view,and carried out the study of the life circle of middle and low-income settlements in the main city of Wuhan.First of all,this paper analyzes the domestic and foreign research progress of low and middle-income housing and life circle theories by combing and summarizing the existing research.Then,analyze and delineate the connotation and distribution of low and middle-income settlements,and at the same time,dissect the connotation of facilities and services in the 15-minute life circle,and theoretically realize the relationship construction of the 15-minute life circle in low-and middle-income settlements.Then,establish the above relationship based on the OD matrix analysis and the nearest facilities analysis by the Network Analyst model,and the relationship data between low and middle-income settlements and service facilities is obtained.Afterwards,the data was analyzed for differentiation index,facility coverage calculation,ecological factor analysis,and facility accessibility analysis.The results show that service capabilities of life circles are unevenly,the overall development degree is lagging,and some facilities are insufficient.Among them,the differentiation index is generally higher than 0.5,the average coverage rate of facilities is only 53%,the life circle can be divided into 3 stages and 9 levels according to the degree of development,and the average reach time of facilities is over 21 minutes.Then,from the three perspectives of urban history,urban planning and economic system,the reasons for the differentiation of life circle were discussed.Finally,based on the research conclusions,research process and research methods,this paper summarizes the innovations and deficiencies of this study,and looks forward to the research on the differentiation of the 15-minute life circle in Wuhan’s low and middle-income settlements.