Dissolving a Composite Topology
Concept Procedure Quick Reference
 
 
 
NoteThis procedure applies only to drawing objects.

To dissolve a composite topology

  1. In Map Explorer, right-click the topology to dissolve Analysis Dissolve.
  2. Note that topologies must be loaded before you can work with them. See To load a topology.

  3. In the Topology Dissolve - Set Parameter dialog box, for Dissolve By, specify the data element to use for the new topology. To select a field from an object data table or a column from an external database, click (Expression Evaluator).

    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.