Model depth is categorized into three levels based on varying requirements, allowing design firms to define the appropriate depth level according to their specific business needs.
1. Depth Level I
This level roughly corresponds to the requirements of the schematic design phase. Model components at this stage only need to depict the basic shape and overall dimensions of the building entity without showing detailed features or internal structures. The information included should cover fundamental data such as area, height, and volume, with optional semantic information. This level is typically used for site modeling or during the schematic design phase.
2. Depth Level II
Equivalent to the depth needed during the preliminary design phase, model components should represent the main geometric characteristics and key dimensions of the building entity. Detailed features and internal compositions are not necessary at this level. Components should include essential parameters such as main dimensions, installation sizes, types, specifications, and other relevant attributes. This level is generally used in preliminary design modeling and for modeling building components ready for procurement during the construction drawing phase.
3. Depth Level III
This level aligns with the requirements of the construction drawing design phase. Model components must accurately represent detailed geometric features and precise dimensions of the building entity, including necessary detailed elements and internal structures. Components should incorporate comprehensive information needed for subsequent project stages, such as quantity estimation, material statistics, and cost analysis. This includes specifications, main technical indicators, performance parameters, and technical requirements. Depth Level III is typically used during the construction drawing design phase.
Source: Guidelines for BIM Implementation Standards in Design Enterprises
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