## 5 Discussion on Relevant Issues
### Advantages and Disadvantages of Inventory and Suggestions for the Development of Roofop Agriculture  
In response to this inventory, the advantages and disadvantages were analyzed and summarized as follows: Advantage 1: According to relevant urban building regulations in China, inventory standards were formulated, and the inventory methods strive to be simple and practical, which can explain problems within a certain error range and provide methods and ideas for conducting urban ground space inventory. Advantage 2: Selecting the roofs of the Shibei District of Qingdao as the GIS analysis object and utilizing the convenience of research and combined with satellite map comparison and judgment ensures the accuracy of the research results as much as possible while efficiently completing the inventory. Disadvantage 1: There were insufficient high-resolution data processing capabilities and new technology applications. A satellite image resolution of 0.96 m is average, and it is recommended to have a clearer resolution within 0.6 m. There were some rough analyses and deviations caused by subjective factors that are inevitable. There was also a failure to utilize technologies such as LIDAR and drones to improve inventory efficiency and accuracy. Disadvantage 2: The study did not comprehensively consider factors that affect agricultural planting, such as roof load capacity and lighting conditions, which also require further exploration of the practical feasibility of the identified roofs. Disadvantage 3: Qingdao is a coastal city with a large number of sloping roofs, resulting in a low amount of usable roof area, so the results are not generally universally suitable for other regions. However, from another perspective, the conservatism of the inventory data here also demonstrates the enormous potential of rooftop agriculture. Given various constraints, this inventory work is intended to serve as a catalyst for further exploration. It is recommended to refine the relevant elements in the future roof inventory. Through the analysis of more elements, the inventory map drawn will be more detailed and feasible. Inventory work is completed through the joint efforts of governments, researchers, and various groups in the West. Its analysis of problems is more scientific and detailed, and some are worth learning from. For example, when inspecting sites, we should consider as many factors as possible that affect agricultural planting, including site characteristics, lighting conditions, surrounding environment, etc., and rank the development advantages and disadvantages [2]. In addition, inventory data can be shared on the Internet, which is beneficial for practitioners and researchers to master urban spatial information. At present, roof agriculture in Qingdao and China has not yet achieved good development. Based on the national development environment and the results of this research, the following suggestions are given: (1) Firstly, strong policy intervention is crucial for the development and improvement of roof agriculture practices [26]. The Chinese government and cities should respond positively to urban agriculture based on goals such as food safety, improving urban quality of life, and education and make corresponding policies and incentives, such as legalizing and standardizing urban agricultural behavior, providing certain financial support, technical assistance, and encouragement. (2) Regarding overcoming obstacles to development, the development of rooftop agriculture is relatively slow in China. In addition to the unavailability or inconvenience of spatial use, there are also problems with traditional thinking such as \"agriculture in the suburbs\", insufficient bearing capacity of old building structures, poor accessibility, the high time and financial cost of construction and maintenance, and intermittent planting during cold and hot seasons [28].