2011

Erase
Erase determines the geometry from the Source that does not intersect with
the Overlay. The intersecting pieces are discarded. Use Erase to subtract a
geometric section from a feature class. For example, find all roads that lie
outside the enterprise district, or all hospitals that are outside the flood zone.
The resulting layer has the attributes of the Source feature only.
Erase supports the following geometry types:
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Erase: line/polygon
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Erase: point/polygon
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Erase: polygon/polygon
Identity
Identity creates new features where the Source and Overlay features intersect.
Use Identity to split features at the point where they intersect with another
feature class, and to create new features at that point. For example, divide
roads or parcels where they cross county borders.
Feature attributes from both the source and overlay are included in the
resulting features, but only the intersecting features will have the values from
both. If AutoCAD Map 3D splits an original feature to produce an output
feature, it uses the Split/Merge rules to determine how to assign the attributes.
When that occurs, attributes of the Overlay feature are appended to the
resulting features. Non-intersecting Source features retain their original
properties.
Overlaying Two Feature Sources | 1313