2011

The order of the geometries you select is important. To compare line and
polygon geometries, the line geometry must be the Source layer. If you select
a polygon geometry as the Source, line geometries are not available as the
Overlay.
The available choices for Type depend on the geometry in the Source and
Overlay. However, if the Source or Overlay is binding data, AutoCAD Map 3D
cannot determine the geometry types before it executes the operation. In that
case, all Type options are available, even if some of them are invalid. The
output might be empty if there are no valid geometry combinations.
If either the Source or the Overlay contains multiple geometries, you can select
any feature class or layer in Overlay and any overlay operation in Type.
However, the output might be empty if there are no valid geometry
combinations. Also, if the geometries include both polygons and lines, any
lines that intersect polygons will split those polygons, which may not be
desired.
Overlay Types
Overlay types include:
■
Intersect (page 1311)
■ Union (page 1312)
■
Erase (page 1313)
■
Identity (page 1313)
■ Clip (page 1314)
■ Paste (page 1315)
■ Symmetric Difference (page 1315)
Intersect
Intersect determines the geometry that overlaps in the Source and Overlay
feature sources. Anything that does not overlap is discarded from the output,
so the resulting layer represents what the Source and Overlay have in common.
Use Intersect to find points or lines that lie within a polygon, or to determine
the places where two line features overlap. For example, find tree points that
are within park polygons.
The resulting layer has the attributes of both the Source and Overlay features.
Overlaying Two Feature Sources | 1311