In BIM technology, the term LOD is frequently discussed in related research. LOD stands for Level of Detail or Level of Development. When translated as “level of detail,” “intricacy,” or “degree of development,” it originates from the American Institute of Architects (AIA) document E202. This document defines the expected level of completeness at various stages of the building lifecycle.
Document E202 outlines five distinct levels of BIM model development (LOD):
1. LOD 100: This level represents the overall building volume in 3D models or other data formats, capturing information such as area, height, volume, position, and orientation.
2. LOD 200: At this stage, model elements are generalized systems or assemblies. They provide approximate data on quantity, size, shape, position, and orientation. Additionally, non-geometric attribute information can be incorporated into model components.
3. LOD 300: Model components become specific assemblies, containing accurate details such as quantity, size, shape, position, and orientation. Non-geometric attribute information remains part of the model components.
4. LOD 400: This level involves detailed assemblies that include precise information necessary for manufacturing, assembly, and construction. It covers exact quantity, size, shape, position, orientation, and other required data. Non-geometric attributes are also included.
5. LOD 500: The highest level, representing constructed assemblies with accurate data on actual quantity, size, shape, position, and orientation. Non-geometric attribute information is also embedded within the model components.
That concludes our overview of the five BIM model development levels. We hope this explanation helps deepen your understanding of BIM model accuracy. To expand your BIM knowledge further, consider following our courses for BIM Engineers, Technical Managers, and BIM Project Directors.
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