2011

Table Of Contents
The output layer has attributes from both the Source and Overlay. Features
resulting from the Source geometry have values for Source attributes, but their
Overlay attribute values are NULL. Features resulting from the Overlay
geometry have values for Overlay attributes, but their Source attribute values
are NULL.
Symmetric Difference supports polygon/polygon comparisons only.
Symmetric difference: polygon/polygon
To perform an Overlay operation
NOTE This procedure applies only to geospatial feature data. For information
about using overlays for drawing objects, see
To overlay two topologies (page
1339).
1
Connect (page 308) to the features sources to compare.
To use a feature layer, you must add it to your map. To use a feature class,
you must connect to its data store, but you need not add it to the map.
2 Analyze tab Feature panel Feature Overlay
3 On the Overlay Analysis dialog box - Source and Overlay Type page (page
1563), specify the following:
Source: Specify the feature layer or feature class to use as the source.
For information about considerations in selecting Source and Overlay
entries, see
the Concept tab for this topic (page 1309).
Overlay: Specify the feature layer or feature class to use as the overlay.
Type: Select the type of overlay comparison to perform. For more
information on the available types, see
the Concept tab for this topic
(page 1311).
4 Click Next.
5 On the
Overlay Analysis dialog box - Set Output and Settings page (page
1565), specify the following:
Output: Specify the name and location of the SDF file that will contain
the result of the Overlay operation.
1316 | Chapter 8 Analyzing Data