ABSTRACT
The paper describes the conditions a design building model has to fulfill to enable automatic identification of building elements from the site images. The purpose of element identification is a comparison between the construction schedule plan and the actual work performed on site throughout the building process. For the recognition of built elements the existing geometry from a 4D design model is used as a reference model to improve the recognition process. The result of the comparison process is a geometry model, which represents the real situation on the building site. It consists of elements recognized in the 4D design model. By using the time dimension in the 4D design model it is possible to identify differences between the built and the planed situation and act accordingly. The modeling conditions are explained through modeling recommendations and the required model structure. Furthermore conditions are described for transforming the design model into the import model used for the comparison process.
