In this exercise, you
will import an aerial image from Google Earth into AutoCAD Civil 3D.
To provide a useful source
image, Google Earth must display the image from directly above.
If the image is tilted, it will still be captured by AutoCAD Civil 3D.
However, it will not be a useful representation of the surface when
it is converted to a render material.
When the Google Earth
image is imported into AutoCAD Civil 3D, it appears in the drawing as
a gray scale image object. The image is scaled by both the linear
units in the drawing and the extents of the latitude/longitude of
the image. The image aspect ratio matches that of the image displayed
in the Google Earth window. AutoCAD Civil 3D automatically generates a
name for the image, using the first three letters of the drawing
file name and a unique ID number. The image is saved in the same
directory as the drawing file.
When the image is draped
on the surface, a new render material is created from the image,
and the render material is applied to the surface. If the image
is larger than the surface, the image is clipped to the extents
of the surface object. If multiple, smaller images are needed to
cover a surface, you must combine them into a single image.
If you do not want
to get your surface image from Google Earth, you can use Autodesk
Raster Design to prepare images from other sources. Using Raster
Design, you can
- combine multiple images into a single image.
- convert images to a format (such as BMP,
DIB, GIF, JPG, PCX, PNG, RLE, TGA, or TIF) that is suitable for
use as a render material.
- orient and scale an image appropriately
for a drawing.
For more information,
see the AutoCAD Civil 3D Help topic Importing a Google Earth
Image to AutoCAD Civil 3D.
This exercise continues
from Exercise 1: Publishing Surface Data to Google Earth.
Import a Google Earth image
exercise uses Surface-8.dwg with the modifications
you made in the previous exercise.
- In Google Earth, ensure that the image
is viewed from directly above.
If the Google Earth navigation
controls are not visible, hover the cursor over the compass at the
upper right-hand corner of the screen:
- To reset the tilt so that the image is
viewed from directly above, double-click . Alternatively,
you can press the R key to reset the tilt.
- To reorient the view so that North is
oriented toward the top of the screen, click . Alternatively,
you can press the N key to reset the North orientation.
- To pan back to the view that was originally
published, double-click the appropriate link under Temporary Places.
- Click Insert tabImport panelGoogle Earth drop-downGoogle
Earth Image .
- When prompted to select a coordinate
system for image location, press Enter to accept the default Coordinate
The gray scale Google
Earth image appears in the drawing window in the appropriate location
under the surface object. The image was placed on the current layer,
which is named Image in the current drawing.
To continue this tutorial,
go to Exercise 3: Draping an Image on a Surface.