The 'LoH - Level of History' for an Aware HBIM Process

Abstract

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.

The Application of Historic Building Information Modelling (HBIM) to Cultural Heritage: A Review

“…The highest LOD for BIM refers to as-built, the current state of CH, but achieving that LOD in a heritage project is not yet feasible. It could be argued that the only standard definition applicable to HBIM is the recent definition of the Level of Information Need (LOIN), new to ISO 19650 [60], which is composed of the level of model detail and level of associated information, positing that in some instances a low level of model detail can be mitigated via a high level of associated information [1].…”

“…Thus, HBIM projects often define new LODs [61][62][63] or entirely new categories more appropriate to CH [43,64,65]; notable examples include the Level of Knowledge (LOK) [43], Level of History (LoH) [60,66] and Grades of Generation (GoG) [65]. The frequent creation of new terminology and definitions lead [48] to suggest that HBIM workflows are only applicable to the existing asset and cannot be applied to a new addition.…”