BIM LOD (Level of Development) and Level of Detail are often used interchangeably but have distinct meanings:
Level of Detail (LOD):
Refers to the amount of detail included in a model's graphical representation, such as the number of polygons, textures, or level of intricacy.
Level of Development (LOD):
Defines the level of reliability, accuracy, and completeness of a model's information, including geometry, data, and specifications.
The American Institute of Architects (AIA) defines LOD specifications, which include:
LOD 100: Basic representation
LOD 200: Approximate geometry
LOD 300: Precise geometry
LOD 350: Detailed, coordinated model
LOD 400: Fabrication-ready model
LOD 500: As-built model
Understanding LOD helps stakeholders:
Define model requirements
Manage expectations
Ensure data accuracy
