What is Baseline?

Definition of Baseline in Construction
The baseline of a structure is the established layout line, or elevation or another type of control point that the surveyor, engineer or architect has identified as the baseline. In most cases the baseline will be used to establish the proper layout of the structure or the project, and will be used consistently on all documents developed for the project. In some instances this baseline can mean a precise and consistent elevation. The term can be used as a generic term also. Baseline can reference almost any type of control line or elevation that the architect or another entity that is responsible for the proper layout of the project determines. The important aspect of this line or elevation, is that all parties on the project use its location as a control point for project layout and coordination.