Extracting Surface Data
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You can extract AutoCAD primitive entities from an AutoCAD Civil 3D surface.

Extracting individual components from a surface enables you to manipulate these components without exploding the surface object. The surface data available to extract is based on the display properties of the selected surface.


The extracted objects preserve the properties set in the current surface style.

The following table lists the extracted objects for each type of surface components.

Surface component ... Is extracted as ...
Points (2D and 3D) Point objects
Triangles (2D and 3D) 3D face objects
Border (2D)
  • POLYLINE object
  • LWPOLYLINE object (if the Border Display Mode is set to Flatten to Elevation)
Border (3D)
Major Contour (2D and 3D) LWPOLYLINE object
Minor Contour (2D and 3D) LWPOLYLINE object
User Contours (2D and 3D) LWPOLYLINE object
Gridded (2D and 3D)
Directions (2D and 3D) The type of object depends on the surface style settings. See Creating a Surface Style.
Elevations (2D and 3D)
Slopes (2D and 3D)
Slope Arrows (2D and 3D)
Watersheds (2D and 3D)

Tutorial Exercise: Extracting Objects from a Surface

Extracting Surface Data
Quick Reference


Select a surface. On the Surface tab, Surface Tools panel, click Extract Objects


Surfaces menu UtilitiesExtract Objects From Surface

Command Line


Dialog Box