Urban Physical Examination Evaluation Based on Multisource Data: A Case Study of Changsha City

Abstract

With the continuous increase in the rate of urbanization, more attention is being paid to quality of life in cities. At present, China's major cities are facing multiple challenges, including resource shortages, environmental pollution, population congestion, traffic congestion, and inequality of public service facilities, all of which have become controversial issues affecting the development of high-quality human settlements. Taking Changsha City as an example, this study attempts to solve the problems of incomplete physical examination elements, slow data update, and previously inconsistent evaluation standards. Under the guidance of problems and objectives, a scientific, comprehensive, applicable, and operable urban physical examination index system was built to provide effective support for the comparative analysis and accurate evaluation of urban development positioning. Based on remote sensing images, social open big data, and statistical data, this study constructed an urban physical examination index system from eight aspects: ecological livability, health and comfort, safety and resilience, convenient transportation, style and features, tidiness and order, multiple inclusiveness, and innovation vitality. The evaluation standard value was determined from the perspective of vertical national standards and planning references, along with a horizontal comparison of cities at the same level. The normalization method and analytic hierarchy process were used to calculate and evaluate the urban natural background and operational signs. The findings were as follows: 1) The overall human settlement of Changsha is good, and the comprehensive score of each aspect above 0.7. The city has a high degree of ecological livability and cleanliness, but the aspects of traffic convenience and safety resilience need to be improved. There is still room for improvement in style and characteristics, health and comfort, innovation and vitality, and diversity and inclusiveness. 2) The level of thematic development in each district and county is uneven. Yuelu District has the highest average score, while Kaifu District and Tianxin District have the most balanced development levels in terms of different aspects. On the basis of retaining the regional functional characteristics, each district and county should focus on solving development and narrowing the gap with other districts and counties. 3) The indicators of population density in the central urban area, number of days with good air quality, and mortality rate of 10,000 vehicles are at the highest level, but there is still a certain gap with the urban development demand in terms of complete coverage of convenience service facilities, residential building renewal and development, and group inclusion, among other aspects. According to the results of urban physical examination based on multisource data, in the future Changsha City needs to be solutionoriented, accurately manage "urban disease," and strive to improve the life satisfaction, happiness, and sense of belonging of urban residents. This study could provide reference research ideas for the fusion of static statistical data and dynamic emerging data derived from urban physical examination, the construction of a scientific and comprehensive index system, and the establishment of horizontal and vertical evaluation standards. At the same time, it could provide decision support for the diagnosis of prominent urban disease problems in Changsha and the better management of the city.

Keywords

• urban physical examination
• multisource data
• index system
• human settlements
• changsha city