The “LoH - Level of History” for an Aware HBIM Process

The HBIM procedure is different from the traditional BIM one, because the HBIM moves from an historical- critical knowledge process, on which then the project dedicated to architectural heritage roots. Consequently, the H-model is characterized by objects with different LoDs. A useful reference is the one offered by LoINs –Level of Information Need– that introduce the idea that LoDs can be critically defined. The paper highlights the differences between BIM and HBIM and consequently it proposes the definition of a new Level of Developmet, called LoH “Level of History”. In particular, the representation of the architectural heritage requires the management of information that are not considered in the well-established BIM procedures for new buildings. LoH is made by historical information not computable and related to those aspects that have contributed to the formation of current configuration of the building. Since this historical information can be more or less exhaustive, three levels of LoH can be assumed: high, medium and low. In order to enter this additional information within the HBIM environment, the HBIM database has been expanded using Visual Programming Language.