Function Description

The Object Editing group on the Edit Data tab provides the function to handle the boundary of line or polygon geometries. The curve smoothing function mainly smooths the boundary of a line or region, converting polylines into continuous smooth line objects.

The controls in the Object Editing group are only available when there is a selected geometry (line or region) in an editable layer in the map.

• The Smooth function is used to smooth the boundary of a selected line or region in an editable layer in the current map.
• Smoothness indicates the degree to which the original line object becomes smoother. This parameter value is proportional to the number of nodes in the transformed line object. Its value type is an integer, ranging from 2 to 10.
• For the principle and result description of curve smoothing, please refer to: Smooth Method Description.
• The line object participating in the smoothing must have at least 3 nodes (including 3). Because a straight line formed by two points is already smooth, no smoothing is needed.

Function Entry

• Edit Data tab -> Object Editing group -> General editing -> Trimming -> Smooth

Operation Instructions

1. Set the layer containing the geometries (lines or regions) to be smoothed in the map to editable status.
2. Select the geometries (lines or regions) to be smoothed. You can hold down the Shift or Ctrl key to select multiple geometries consecutively.
3. On the Edit Data tab, in the General editing drop-down menu, click the Smooth button in the Trimming group to open the Curve Smoothness Setting dialog box.
4. Enter the curve smoothness value in the text box to the right of Smoothness. The default value is 4.
5. To smooth geometries in other layers in the map, repeat steps 1 to 4 above.
6. Click the OK button to complete the curve smoothing of the selected objects.

Notes:

When multi-layer editing is enabled, users can simultaneously select multiple lines and regions from multiple editable layers for curve smoothing.