1-Watch my presentation: LOD vs LOID

Level of Development (LOD) is a term used to define to what extent a BIM Object should be defined. This term refer both to the geometric level of detail and non-graphical level of detail. However, the non-graphical level of detai has not been properly defined in terms of attributes by the AIA. Nonwithstanding, several attempts to define to which extent data BIM objects should be developed has taken place globally.

The Level of Development Specification from the USA can be read together with the NATSPEC BIM Object element matrix. The first guide contains a graphical description of the object (LOD), whereas the second one defines attributes to different LODs. The second one categorises attributes according to its scope (i.e. IFC or COBie). On the other hand, the Australian and New Zealand Revit Standards matches attributes with GUIDS or Global Unique Identifiers so the information is defined consistently accros the project. In my opinion, there are opportunities for manufacturers to create construction ontologies with GUIDs attached to them so information can be consistently retrieved within different subsidiaries. Furthermore, MVD or Model View Definitios such as COBie or Sparkie may be handy to carry on a quality control of the data.

#BIM #productdata #LOD #LOID #Manufacturers