Topology Buffer - Set Buffer Distance dialog box
 
 
 
NoteThis functionality applies only to drawing objects.

Use this dialog box to specify the distance from the object to the buffer. The buffer will extend the specified distance from the objects. You can enter a number, an expression, a field in an object data table, or an external database.

To buffer a topology

Click Analyze tabDrawing Object panelObject Buffer. At the Command prompt, enter mapanbuffer.

A buffer is a zone that is drawn around a topology. Using a buffer, you can easily identify objects within a specified offset of elements in node, network, and polygon topologies.

Buffer Distance

Enter distance from the object to the buffer. The buffer will extend the specified distance from the objects. To create a buffer inside an existing polygon, enter a negative value for the buffer offset. The buffer offset can be any of the following:

  • Numeric value. To decrease the size of existing polygons, enter a negative value.
  • An expression that evaluates to a numeric value. For information on valid expressions, see Expression Evaluator Functions and Variables.
  • A value in an object data table. Click Expression Builder to select the table and field.
  • A value in an external database. Click Expression Builder to select the link template and column.
    NoteIf you are creating a buffer around a polygon and want to use a value in an object data table or an external database, the data must be attached to the centroid of the polygon.
Expression Builder

Click to select a field in an object data table or an external database from a list of available data.

Next
Finish

Creates the buffer using the current settings after you specify the buffer distance and enter a valid topology name.