The most direct method for modern users is the and GEOGRAPHICLOCATION commands. Before any export, the AutoCAD drawing must be georeferenced. Using the GEOGRAPHICLOCATION command, the user imports a satellite map from an online source (like Bing Maps) into the AutoCAD drawing space. This process requires the user to define a location by entering an address, coordinates, or interactively picking a point on a map. Once the drawing is assigned a geographic coordinate system (e.g., WGS84), the CAD entities are effectively pinned to real-world Earth coordinates.
The utility of this workflow is extensive across multiple disciplines. In , engineers export horizontal and vertical alignments of proposed highways or railways. By viewing these alignments draped over Google Earth’s 3D terrain, they can assess cut-and-fill requirements, visualize bridge clearances, and communicate route options to stakeholders with an intuitive, visual context. autocad export to google earth
Despite its power, the export process has notable limitations. First, is a frequent source of error. If the AutoCAD drawing is not accurately georeferenced using the WGS84 datum, the exported geometry will appear in the wrong location, sometimes offset by hundreds of meters. Second, vertical exaggeration in Google Earth can distort the perceived height of 3D objects, while complex AutoCAD entities (such as splines, hatches, or dynamic blocks) often fail to export or are translated poorly into KML’s simpler geometry. The most direct method for modern users is
Introduction
Third, become critical. A highly detailed CAD file with thousands of vertices can generate a massive KMZ that severely slows Google Earth’s navigation. Best practices dictate simplifying the CAD geometry—using coarse polylines instead of complex curves and reducing vertex density—before export. Finally, topographic snapping must be managed; users can choose to have their model “drape” over the terrain or maintain absolute altitudes, each offering different visual and analytical outcomes. This process requires the user to define a
In , exporting massing models and building footprints to Google Earth allows architects to evaluate how a new structure will interact with its existing skyline, shadow patterns, and surrounding topography. This is especially valuable for public hearings and environmental impact studies, where a non-technical audience can immediately grasp the scale and placement of a proposed development.
With the drawing georeferenced, the user can utilize the or EXPORTKML command. This tool allows the user to select specific 2D and 3D geometry—such as polylines representing roads, extruded solids representing buildings, or points representing utility poles—and export them directly to a KMZ file. For versions of AutoCAD that lack this native function (e.g., AutoCAD LT), third-party plugins like Plex.Earth or ArcGIS for AutoCAD serve as intermediaries, offering enhanced options for symbology, elevation extrusion, and layer management. The resulting KMZ file can then be opened directly in Google Earth Pro, where the CAD elements appear overlaid on the terrain and satellite imagery.
