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47Â Â 3D digital model: a âmodel-based technology linked with a database of project information, using multidimensional, real-time dynamic modeling software, to plan construction. The model encompasses at least geometry, spatial relationships, geographic information, and quan- tities and properties of componentsâ (North Carolina Board of Examiners for Engineers and Surveyors, 2019). 3D digital models as contract documents: 3D digital models are provided to contractors as part of the legal documents. 3D digital models for information purposes only: 3D digital models are provided to contractors for reference and are not part of the legal documents. If there is a discrepancy between the plans and the 3D digital models, the plans are contractually enforceable. Digital Terrain Models (DTMs): DTMs are continuous representations of the ground surface generated using a large number of selected points with known XYZ coordinates in an arbitrary coordinate field. Feature definitions: geometric elements being modeled, such as curb, centerline, edge, and edge of pavement Material information: the inclusion of material quantities for contract items that could be used for testing and recording purposes Symbologies: the use of 3D digital models to render cartographic symbols for items in the docu- ment (i.e., rather than a point, the item will be a graphic representation of the actual item, such as representing the traffic separator in 3D) Glossary
