The Boundary | New Boundaries | Thiessen
Polygons command 
creates boundaries from selected points. The diagram can consist of polygons,
polylines, or points. In a Thiessen polygon diagram, also known as a Voronoi
diagram, a region is drawn around each point so that for each point every
position in the region around that point is closer to that point than
to any of the other points.
In this example, an area diagram was created from selected points.
To create a Thiessen polygon diagram:
1. Select two or more points and an area if you wish to contain the diagram within an area.
2. Select the Boundary | New Boundaries | Thiessen Polygons command.
3. Set new line, fill, symbol, and ID properties and choose whether or not to create the new polygons, polylines, or points on a new layer in the Thiessen Polygons dialog.
4. Click the OK button in the Thiessen Polygons dialog to create Thiessen polygons.
Set new line, fill, symbol, and ID properties and choose whether or not
to create the new polygons, polylines, or points on a new layer in the
Thiessen Polygons dialog.
Check the Limit results to the selected single-polygon area box to limit the diagram to a selected area's boundary.
You can choose to create polygons, polylines, or points in the Create objects list.
Check the Place objects on another layer box to create the new areas on a different layer. Select a layer from the list below. The list does not include locked layers, layers containing cartogram maps, or layers containing prism maps.
Click the Line button to select line properties, click the fill button to select fill properties, and click the Symbol button to select symbol properties for the new areas.
You can choose IDs from the Object ID method list. Choose No ID and no IDs are assigned to the new areas. Select Prefix+index+suffix to create an ID from the items in the IDs group. Select Source IDs to use the original area's IDs in the new area.
Check the Keep original objects box to create new areas while leaving the original selected areas unchanged.
See Also