## 3 Determine Inventory Standards
### Roof Space Inventory Standards in Shibei District
\begin{table}
\begin{tabular}{c c c c} \hline \hline
**Influencing Factors** & **Impact on Agricultural Planting Activities** & **Inventory Basis** & **Inventory Standards** \\ \hline Building type/function & The different types and functions of buildings as well as the different characteristics of roofs affect the selection of agricultural planting methods and the development of activities. & The roof of residential buildings has good lighting and a demand for vegetables and fruits. The roof area is small and suitable for soil cultivation and outdoor facility cultivation; the roof area of public and industrial buildings is large, with strong commonality, making it suitable for commercial rooftop greenhouses; roof agriculture should not be carried out in buildings with pollution; buildings with parking functions on the roof are not considered; roof agriculture will not be considered for historic and protected buildings, those planting has a negative impact on the functionality of the building, and those whose roofs require significant renovation before planting activities can be carried out. & Distinguish the types of buildings into residential, public, industrial, etc.; exclude polluting buildings, special buildings, and buildings with functional roof requirements. \\ \hline Roof load capacity & The roof must meet the load requirements generated by planting soil, planting facilities, and human activities. & The roof greening code mentions that the roof load of the greening roof should be \(\geq\)3 KN/m2. The Shanghai roof greening standard points out that the roof load of the combined greening roof should be \(\geq\)4.5 KN/m2 (covered with 30 cm soil), and the roof load of the lawn greening roof should be \(\geq\)2.5 KN/m2 (covered with 10 cm soil) [15]. The planting depth and load of soil-cultivated agriculture are basically between the above two; roof hydroponic greenhouses, generally, for accessible roofs are not restricted, and for some restricted roofs, structural reinforcement can be used to achieve this. & Based on comprehensive analysis, the roof soil cultivation agriculture planting should have a roof load capacity of \(\geq\)2 KN/m2; container cultivation, soilless cultivation, etc., are basically unrestricted. \\ \hline Roof lighting conditions & Vegetable growth requires a certain amount of lighting time and the lighting conditions on the roof affect the planting effect. & Different types of vegetables have different requirements for sunlight duration and light intensity. The sunlight duration is divided into long, short, and medium, while the light intensity is divided into strong, weak, and medium; the sunshine demand for vegetables ranges from 12 to 14 h, below 12 h, etc., and generally should be more than 8 h; greenhouse planting should rely on natural light. If it is not possible to obtain it, supplementary light sources can be used. & Conduct sunshine analysis to determine if the roof meets the sunshine duration of 8 h; for those who are not satisfied, consider adopting greenhouse planting with environmental regulation. \\ \hline Surrounding environment & Reconhouses should not be built on residential roofs, as they are small and uneconomical in scale and can easily block the surrounding residential areas from sunlight; when the greenhouse is built on the roof of a public building, the minimum sunlight standard requirements of the building on the north side should be ensured; the installation of rooftop greenhouses and planting facilities (such as sheds) should be considered, combined with the surrounding environmental requirements and paying attention to volume and aesthetics; roof agriculture should not be carried out in areas with high environmental landscape requirements, such as historical building protection areas, coastal areas, tourist landscape areas, etc. \\ \hline \hline \end{tabular}
\end{table} 
Table 1: _Cont._production potential of rooftop agriculture, inferring its development feasibility.