Glossary L - Z

Level of detail

LOD is how much detail is included in the model element.

Citation: "Level of Specification for Building Models", BIM Forum, accessed 01/28/2016

Level of development

LOD is the degree to which an element's geometry and attached information has been thought through or the degree to which project team members may rely on the information when using the model.

Citation: "Level of Specification for Building Models", BIM Forum, accessed 01/28/2016

Model element

A unique object within a model that has specific geometry and properties. Model elements can be tangible (e.g. a piece of equipment) or intangible (e.g. a space). Model elements can also range from simple (e.g. fire extinguisher) to complex (e.g. a multi-component wall system).

Model object

See model element.

Model view definition

An MVD defines a subset of the IFC schema that is needed to satisfy one or many Exchange Requirements of the AEC industry.

Citation: "MVD Overview Summary", buildingSMART International Ltd., accessed 06/13/2017

Property

Unit of information that is dynamically defined as a particular entity instance.

Citation: "IFC4 Documentation", buildingSMART International Ltd., accessed 06/13/2017

Property Occurrence

Unit of information providing a value for a property identified by name.

Citation: "IFC4 Documentation", buildingSMART International Ltd., accessed 06/13/2017

Record BIM

A coordinated model, or set of models, submitted by a contractor (or subcontractor at any tier) to show the construction of a particular structure or work as actually completed under the contract. See BIM Guide 01 for more information.

System

A system is a collection of model elements and assemblies that are linked to one another based on physical characteristics (for example, multiple panels that comprise a single curtainwall system) or functional characteristics (for example, pipe and distribution equipment that are all associated with domestic cold water).

Thermal zone

A single space or group of indoor spaces that has uniform thermal load profiles and conditioning.

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