2011

Table Of Contents
Click Map Topology Overlay.
Menu
Overlay Topology
Icon
MAPANOVERLAYCommand Line
In Map Explorer, right-click a
topology Analysis Overlay
Task Pane
Topology Overlay Analysis - Analysis Type dialog boxDialog Box
Dissolving a Composite Topology
If a topology contains many smaller polygons, you can create a new topology
by combining polygons that share the same data value in a specified field.
This field is called the dissolve field. The dissolve field can be an object data
field or a column in a linked external database.
NOTE This functionality applies only to drawing objects. There is no equivalent
for geospatial feature data.
Dissolving Polygons
When you dissolve a topology, AutoCAD Map 3D checks each boundary
between polygons to see if the dissolve field value is the same for both. If so,
the boundary and one of the centroids are removed. All object fields except
for the dissolve and any new topology fields are removed.
If adjacent polygons do not contain the dissolve field, the boundary is not
dissolved and the resulting polygon has a blank value for that field.
1342 | Chapter 8 Analyzing Data