3D Modeling Ground Level Surface for Roadway Horizontal Alignment Design

Road geometric design requires topographic data of road alignment plans. National Digital Elevation Model (DEMNAS), published by the Geospatial Information Agency, could be used as preliminary data to design horizontal and vertical alignments. This research aims to: the site plan of Polinela 2nd campus geometric correction, 3D modeling of ground-level surface based on DEMNAS, overlaying the road alignment plan on 3D modeling of ground-level surface, identifying the point of intersection, calculating parameters of road bend, describing the ground level profile of the roads alignment plan. Geometric correction, modeling, computing, and drafting were formulated with Autodesk Civil 3D software. The roads plan, which had a bend in its segment, was analyzed. The roads plan would be modeled on a 3D surface to be analyzed for its horizontal alignment parameters, including bend angle, bend radius, circular arc length, transition arc length, superelevation, and the appropriate type of bend. The horizontal alignment parameter analysis refers to the road geometric planning standards set by the Ministry of Public Works and Public Housing. The results show that the four road segments that had to be analyzed for the bend parameters and the appropriate type of bend were full circle (FC) and spiral spiral spiral (SCS)