The copula approach is used to model infrastructure data by analyzing the relationships between different parts of the system. Researchers use this method to understand how different variables are connected and how they affect each other. They found that Archimedean copulas are commonly used for this type of modeling, but they can be limited in high dimensions. To address this, they applied four-dimensional C-vine and D-vine copula models to track geometry data to improve the analysis of infrastructure systems.