2011

Any two adjacent polygons or connected lines that have the same value
for the specified field or column are combined into a single polygon or
line.
NOTE When dissolving a topology, AutoCAD Map 3D uses only data that
is attached or linked to the centroid of the polygon. It does not use data
attached to a polygon border.
4 In the Topology Dissolve - New Topology dialog box, select Highlight to
highlight the resulting topology onscreen. Specify the highlight color.
5 Enter a name and description for the new topology and specify the layer.
Click Next.
6 In the Topology Dissolve - Output Attributes dialog box, do the following:
■ Click
(Expression Evaluator) to select the data to include in the
resulting topology. You can include fields in an object data table or
columns in an external database.
■ Enter a name and description for the object data table that will store
the data in the new topology.
NOTE If you do not want to populate an Object Data Table with the
dissolve information, select the last (empty) item in the list. Selecting this
empty item will not copy data from the dissolve topology.
■ Click Next.
7 In the final dialog box, indicate whether to create new nodes to complete
the resulting topology. If so, specify which a block to use:
■ To use a point, leave the box blank or enter ACAD_POINT.
■ To select from a list of block definitions, click the down arrow.
■ To select a block saved as a DWG file, click Browse. Select the file to
use.
If you are dissolving a polygon topology, you can also specify the block
to use for centroids.
8 Click Finish to dissolve the topology.
1344 | Chapter 8 Analyzing Data