Technical data

Creating Topologies

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Creating Polygon Topologies and Assigning

Data to the Polygons

Unlike points and linear objects, a polygon is an enclosed area that is

defined by lines, arcs, or polylines. It is not an object in and of itself

and therefore, you cannot assign object data directly to it. However,

when you create a polygon topology, centroids are created for the

polygons. This centroid acts as the polygon object. After the centroids

are created, you can assign object data to the polygons.

You can create centroids from existing blocks (and you can create

object data from block attributes), or you can create “missing”

centroids when you generate a link topology for the polygons. The

following task shows how to create a topology that creates centroids.

To create a polygon topology

Steps

Use

to look up

Draw or digitize the polygons using lines, arcs, or

polylines.

Set Up for Digitizing

Clean up the drawing to check for any duplicate

or crossing lines. For more information, see

“Cleaning Up Maps” in this chapter.

Clean Up a Drawing

From the Map menu, choose Topology ➤ Create

to display the Create Topology dialog box.

MAPCREATE

Type a name for the topology.

From the Type

list, select Polygon.

MAPPOLYADD