Abstract: ObjectivesThe "V-shape principle" is a qualitative method widely used in geological mapping to determine the representation of geological boundaries on topographic maps based on the relationship between geological bodies and terrain. However, this method relies heavily on the experience of geological personnel, leading to significant subjectivity and inaccurate positioning. To address the limitations of the "V-shape principle" in compiling geological boundaries, this study aims to develop software for the rapid and accurate drawing of geological boundaries.MethodsUtilizing the Lisp language for secondary development of CAD software, we developed geological boundary mapping software. Through interactive user interfaces, the software inputs attitude, coordinates, and elevation information of surface geological points or points revealed by boreholes. Based on the principle of offset distance mapping, it automatically calculates the intersection points between geological bodies and contour lines. Using the shortest path algorithm, it automatically connects geological boundary points, thereby achieving the goal of rapid and accurate geological boundary drawing.ResultsThe software adheres to the offset distance principle, enabling accurate calculation of outcrop boundary points and quantitatively reproducing the "V-shaped" distribution pattern of geological boundaries as they traverse valleys or ridges.ConclusionsThis study significantly enhances the accuracy and efficiency of geological mapping, demonstrating substantial practical value.