基于网络大数据的城市内部便利性供需空间特征研究——以南京市中心城区为例

基于便利性的城镇发展战略对于新型城镇化转型具有重要意义。着眼于城镇居民生活质量的提升，围绕供需维度构建便利性测度体系，以多源网络大数据为支撑，分析南京市中心城区便利性的供需空间特征。结果表明，中心城区便利性供需关系多样，空间分布大体类似，倾向于多类聚合分布，并呈现较为明显的圈层集聚特征；主城便利性多供小于求，副城则以低供需平衡及供小于求为主，各公共活动中心便利性发育水平不一；中心城区整体便利性供需水平不高，其空间分布在数量及连续性方面均呈现低供需平衡、低供-中需以及中供-低需依次降低的模式。

STUDY ON THE SPATIAL CHARACTERISTICS OF SUPPLY AND DEMAND OF URBAN AMENITIES BASED ON NETWORK BIG DATA: A CASE STUDY OF CENTRAL URBAN AREA OF NANJING

At present, the rate of urbanization in China has reached 58.52%, under the background of new urbanization strategy, urban development has entered the stage of intensive urbanization with emphasis on the quality improvement and importance of putting people first. And the main contradiction of our society has also been transformed into the contradiction between the growing demand for better life and the unbalanced and inadequately development. Therefore, in order to improve the attraction, meet the growing demand for quality of life, promote the social justice, the strategy of urban development based on amenity is of great significance and value to the transformation of urbanization in a new stage of urbanization in China. Focus on improving the quality of life of urban residents, taking the amenity as the research content, the amenity measurement system is built around the two dimensions of supply and demand. And then taking the central urban area of Nanjing as a case, the spatial characteristics of the supply and demand of urban amenities are analyzed based on network big data with multi-source. The results show that:1) The supply and demand relationship of urban amenities are diverse and the spatial distribution is similar; 2) Most of the amenity supply in main urban area is less than the demand, the amenity in sub-urban area is on the basis of the low supply and demand balance, and less supply than demand; 3) the level of convenience supply and demand is not high in the central urban area.