关键词: 城市用地功能, POI数据, 定量识别, 济南市

Abstract:

Making full use of big data to identify urban land use function can help to grasp the urban spatial structure and promote the rational layout of urban interior space. POI data is a kind of easily available and representative spatial point-like data in the era of big data, which can effectively determine the actual function of urban land. Based on 185,126 POI data in five districts of jinan, this paper deleted duplicates, corrected deviations and reclassified the obtained data, constructed a functional classification system of urban land, and used frequency density, type ratio and kernel density estimation to identify and evaluate the urban land functions in five districts of jinan, and use the error matrix to test the recognition results.The results show that: (1) mixed functional land and single functional land presents the regional distribution characteristics of the circle, the "core-periphery" distinction is obvious; (2) from the inward to the outward, the concentration trend of single functional land is weakened, the diversity of mixed functional land is reduced, and different land shows different spatial distribution patterns; (3) Through the error matrix and the actual land use of the planned land and electronic map in the land use plan, the overall accuracy is 75.67%, and the recognition result is more accurate.

Key words: urban functional land, POI, quantitative identification, Jinan