How to Create Surfaces Using DEM (Digital Elevation Model) in Civil 3D | DEM Steps 2026 Learn how to create accurate surfaces using DEM (Digital Elevation Model) files in Autodesk Civil 3D – step by step (2024). This tutorial is perfect for civil engineers, GIS professionals, surveyors, students, and beginners who want to work with real-world elevation data and convert DEM files into professional Civil 3D surfaces. What you’ll learn in this video: ✔ What is a DEM (Digital Elevation Model) ✔ How