On 19th June and 13th July, Italian team of ENI CBC Med BEEP project performed the geometric architectural survey of the Palazzo del Clementino.
They used the 3D laser scanner method applying an instrument that acquires the position of millions of points through successive scans, which make and define the surface of the surrounding objects with very high speed and precision. The result of this scan is a 3D point cloud that accurately reproduces the real object. 

Two different types of laser scanners have been employed:

• Mobile/ dynamic, for internal spaces, which uses the Slam (Simultaneous Localization And Mapping) system, that is the process by which the tool constructs a map of an unknown environment and simultaneously keeps track of itself position while it’s moving within it , for a quick scan of the volumes.

• Static, for façades and external areas, that allows to capture larger portions of a building to generate a more precise point cloud, using a sequence of gripping points.

The reasons for choosing this survey methodology are related to the connotation of the 3D point cloud. The points have information of a geometric nature, as each of them has spatial and georeferenced coordinates, and of a colorimetric character, since every point has a relative color obtained from a photo taken by the instrument during the scan.

The first feature is useful for the type of modeling that will be carried out, i.e. Heritage Building Information Modeling (HBIM). The point cloud is used as a basis for the modeling process by "tracing" the surfaces generated by the points. The result is a 3D twin model very faithful to the existing building, that contains objects filled with various kinds of information updatable any time.
The second one allows to know the state of conservation of the property, including the cracking and the level of deterioration, and it’s useful for keeping track of changes and restoration works carried out over time.

About the BEEP project:

BEEP project aims at strengthening the use of Building Information Modelling (BIM) to enhance energy efficiency in buildings. The testing of this emerging technology on built heritage will be performed to demonstrate its scalability to the entire building stock. The project will provide public administrations with a powerful method for the energy rehabilitation of public buildings to be supported with private funds through the Energy Performance Contracting (*). The project main outcome will be an innovative methodology based on the integration of emerging technologies tested on 9 heritage public buildings located in Italy, Spain, Cyprus, Jordan, Palestine, Lebanon, and Egypt.

(*) Energy performance contracting (EPC) is a mechanism for organising the energy efficiency financing. The EPC involves an Energy Service Company (ESCO) which provides various services, such as finances and guaranteed energy savings. The remuneration of the ESCO depends on the achievement of the guaranteed savings. The ESCO stays involved in the measurement and verification process for the energy savings in the repayment period. ESCO and energy performance contracting are mostly found in the public sector and to a lesser extent in the industrial and commercial building sectors (Hilke and Ryan, 2012). Source: European Comission

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