Evaluation and Planning Strategy of Urban Street Green Space from the Perspective of Supply and Demand Balance: a Case Study of Hongjialou District in Jinan City

Urban street green space is an important part of urban public space and one of the most direct places for people to perceive the city. From the perspective of supply and demand balance of urban street green space, taking Hongjialou block of Jinan City as an example, the supply and demand level of urban street green space was measured by street green visibility level and demand index. With the help of open platform data such as Baidu map and Gaode map, the supply and demand balance of urban street green space was evaluated by using ArcGIS network analysis technology and segnet semantic segmentation technology. The results showed that in terms of green space supply, the overall green space supply level of Hongjialou block in Jinan was not high, and only 24% of the sites with good green space supply were selected. The green space supply level of Huayuan road was higher than that of Hongjialou South Road and North Road. In terms of green space demand, the west section of Huayuan road had the highest street demand, showing a trend of gradually decreasing from west to east, and there were several spots with high street demand in the middle section, while Hongjialou South and North roads had higher street demand in the south and north sections, and lower in the middle. The street demand of Huayuan road was higher than that of Hongjialou South Road and North Road. In terms of supply-demand balance, Huayuan road had a high matching degree of supply and demand for green space, while Hongjialou South Road and North Road had a poor matching degree of supply and demand for green space, with 44.12% in the quadrant of "low supply and high demand". Finally, from the two aspects of supply and demand, the paper put forward targeted optimization strategies. The research could provide research ideas and methods for urban renewal.