Abstract
Understanding urban spatial pattern of land use is of great significance to urban land management and resource allocation. Urban space has strong heterogeneity, and thus there were many researches focusing on the identification of urban land use. The emergence of multiple new types of geospatial data provide an opportunity to investigate the methods of mapping essential urban land use. The popularization of street view images represented by Baidu Maps is benificial to the rapid acquisition of high-precision street view data, which has attracted the attention of scholars in the field of urban research. In this study, OpenStreetMap (OSM) was used to delineate parcels which were recognized as basic mapping units. A semantic segmentation of street view images was combined to enrich the multi-dimensional description of urban parcels, together with point of interest (POI), Sentinel-2A, and Luojia-1 nighttime light data. Furthermore, random forest (RF) was applied to determine the urban land use categories. The results show that street view elements are related to urban land use in the perspective of spatial distribution. It is reasonable and feasible to describe urban parcels according to the characteristics of street view elements. Due to the participation of street view, the overall accuracy reaches 79.13%. The contribution of street view features to the optimal classification model reached 20.6%, which is more stable than POI features.
Highlights
Acceleration of urbanization and the proposal of smart city brings new demands to the refinement of urban governance
Based on the distribution of the spatial street view elements, there is a correlation between the street view and the land use
Urban parcels whose predicted land use was different from the actual dominant land use category were concentrated in the southwest, middle, and north of the study area, while the prediction was good in the southeast and south of the study area
Summary
Acceleration of urbanization and the proposal of smart city brings new demands to the refinement of urban governance. Spatial pattern of urban land use, which affects urban activities, is an important information for urban investigation, modeling, and resource allocation [1,2,3,4]. Traditional methods for mapping urban land use rely on remote sensing, and identified land patches are relatively fragmented, which differ from the more regular spatial scope of urban management. Gong et al (2019) regarded parcels which are bounded by road networks as the intrinsic segmentation of urban land use [5]. Many scholars used OpenStreetMap (OSM) to delimit the boundary of parcel, and the methods performed well [6,7]. OSM is considered to be a promising data source for rapid and reliable parcel delineation to meet the needs of fine urban management [3,12]
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