Key technology for section analysis of 3D geological models based on the online virtual earth environment

Integrating a 3D geological model into the virtual Earth environment enables the display of the geological model on a larger scale, making the surrounding terrain and landform more intuitive, and improving the accuracy of geological research. Because the section analysis of 3D geological model can clearly show the geological structure and attribute information on a section, it is a popular analysis method for geologists. However, the existing methods based on Boolean operations have high requirements on the topological relationship of the model, and their efficiency and accuracy are not ideal when faced with complex 3D geological models. Meanwhile, traditional rendering-based methods can only obtain pixel-level sectional results, making measurement difficult. This paper proposes a cutting analysis algorithm for 3D geological model in virtual earth environment. This method utilizes hierarchical bounding volume (BVH) and ray intersection algorithm to extract formation boundary data, avoiding complex Boolean operations and improving the efficiency of section analysis. Furthermore, using these data to draw measurable geological section maps effectively solves the problem that the section results cannot be measured. This method can be used to quickly and effectively obtain a section diagram the conforms to the standard diagram legend, which can be directly used in the preparation of geological analysis reports. The feasibility of this method is verified by taking the section analysis of a complex 3D geological model in a certain area as an example.