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.
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
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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. Note:
If 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
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Click to select a field in an object data table or an external database from a list of available data.
- Next
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Click to display the Topology Buffer - New Topology dialog box.
- Finish
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Creates the buffer using the current settings after you specify the buffer distance and enter a valid topology name.