The advantage of this method is automation. Instead of drawing lines manually, the software generates a grid of points or a triangulated irregular network (TIN) and converts it into contour polylines. These tools handle the heavy lifting of interpolation, allowing the user to import a ready-to-use topographic map directly into AutoCAD with specified intervals (e.g., 1-meter or 5-foot contours).
To begin, the user must toggle the "Terrain" layer in Google Earth to visualize the 3D relief. Using the "Add Path" tool, the user manually traces lines along areas of equal elevation. This process is subjective and requires a keen eye to interpret where the terrain rises and falls. Once a network of paths is created representing the desired contours, the user saves the project. Google Earth Pro allows data to be saved as a Keyhole Markup Language (KML) file. The crucial step is then selecting "Save Place As" and choosing the .DXF (Drawing Exchange Format) file type. how to get contours from google earth into autocad
For professionals using Autodesk’s Civil 3D, a more robust workflow exists that bypasses the need for contour lines initially. Civil 3D can import the terrain as a "Surface." By using the "Import Surface from Google Earth" command (available in newer versions or via the Planning and Analysis workspace), the software imports the actual terrain mesh points. The advantage of this method is automation
Once points appear, right-click in the Prospector tab and select Create Surface . To begin, the user must toggle the "Terrain"