If
AutoCAD Raster Design toolset is installed on a geographic application, such as
AutoCAD Map 3D toolset or AutoCAD Civil 3D, you can transform the coordinate system of an inserted image to match the coordinate system of the drawing. Several types of coordinate transformation are available:
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3-point affine transform enables
AutoCAD Raster Design toolset to handle non-editable data types.
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4-point rubbersheet transform is an approximate transformation that uses four control points.
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True coordinate transformation applies to each pixel in the image, creating a very accurate representation of the surface.