Adaptive Terrain Modeling for Side-Slope Surfaces

Three-dimensional site modeling is an important aspect of Building Information Modeling (BIM), especially in mountainous areas. A key issue in site modeling is how to accurately calculate the shape of side-slopes. It involves three sub-problems: geometric representation of side-slopes, determination of cut/fill types, and intersection of side-slopes surface with the terrain surface. To address this, a two-stage method for constructing side-slope models adaptive terrain is proposed. In the first stage, an algorithm for traversing along polylines is used to calculate the intersection points of the site boundary polylines with the terrain surface, segmenting the boundary polylines based on these intersection points, automatically determining the fill/cut types for each segment using rules, and then obtaining the equations of the side-slopes passing each segment. In the second stage, an algorithm for traversing along plane is used to trace the intersection lines of side-slopes with the terrain. Finally, the side-slopes are rendered with precision by integrating the equations of each segment with the determined intersection lines. The effectiveness of the method is verified through illustrative examples. Extensive analysis and testing have demonstrated that this method not only boasts accuracy and swift computation but also excels in the level of automation achieved in the modeling process.