Change the length of a COGO-enabled line feature

The Change Length command trims or extends a polyline feature based on a length value you type in its dialog box. The dialog box lists the current length of the feature and the COGO length if it exists. This command is available with the Continue Feature tool and Edit Vertices tool .

When you use this command, consider the following:

• A positive or negative value determines whether the first or last vertex remains fixed.
• Changing the length of a z-aware feature preserves the angular pitch of its segments and assigns an interpolated z-value to the moved vertex.
• The Proportion new line length check box is available only when you trim or extend a COGO-enabled line feature containing a distance value in the Distance or ArcLength fields. This setting allows you to scale the geometry proportionately or use the current ground to grid factor setting.

  Tip:

  You can edit COGO attributes with the Attributes pane on the ribbon Edit tab, in the Selection group. Alternatively, use the Update COGO tool in the Modify Features pane to update the direction and distance attributes to match the geometry of the selected line feature.

To trim or extend a COGO-enabled line feature, complete the following steps:

1. Add your data and configure settings for editing.

   Confirm that the feature layer you are editing is editable, the coordinate system assigned to the active map is suitable for the type of edits you're performing, and snapping is configured to help you work efficiently and accurately.

2. If ground to grid correction is required, turn on Ground To Grid on the ribbon Edit tab, in the Correction group, and configure distance and direction offset settings.
3. On the ribbon Edit tab, click Modify Features in the Features group.

   The Modify Features pane appears.

4. Click the Continue Feature tool or Edit Vertices tool .

   To find these tools, expand Reshape, or type Cont or Vertices, respectively, in the Search text box.

5. Click the Change the selection tool in the tool pane and select a COGO-enabled polyline feature.

   If you select more than one feature, reselect the feature. Alternatively, click the feature in the pane selection view to flash it in the map, right-click the feature, and click Only Select This .

   Note:

   If you are using Edit Vertices and map topology is enabled, click the Features tab.

   The Features and Edges tabs are not required to complete this workflow. These tabs are available only when map topology or a geodatabase topology is enabled so that you can switch between editing feature vertices and topological edges and nodes.

   

   The selected feature appears highlighted in the map with vertex handles. By default, project settings symbolize the first vertex green and the last vertex red.

6. Hover over a segment until the pointer changes to the segment cursor .
7. Right-click the segment and click Change Length .

   The Change Length dialog box lists the current geometric length and the COGO length stored with the feature, if it exists.

   If the COGO Distance or ArcLength attribute field contains a distance value, the Proportion new line length check box appears at the bottom of the dialog box.

   

8. To scale the typed value using the current ground to grid correction Distance Factor setting, uncheck the Proportion new line length check box.

   When this setting is unchecked, the specified length value modifies the COGO attribute values and line geometry as described in the following table:

   Typed line length value	Straight lines	Circular arcs
   Positive values	Direction is preserved. Distance is set to the specified value. Line geometry length is updated to the specified value multiplied by the ground to grid scale factor.	Direction is recalculated. Radius is preserved. ArcLength is updated with the specified value. Circular arc geometry length is updated to the specified value multiplied by the ground to grid scale factor.
   Negative values	Direction is preserved. Distance is recalculated. The specified length is subtracted from the current COGO value. Line geometry length is updated to be (the original geometry length) minus (the specified length multiplied by the ground to grid scale factor).	Direction is set to null. Radius is preserved. ArcLength is recalculated. It is updated to be the specified length subtracted from the current COGO value. Circular arc geometry length is updated to be (the original geometry length) minus (the specified length multiplied by the ground to grid scale factor).

   Alternatively, check the Proportion new line length check box to scale the geometry proportionately.

   When this setting is checked, the specified length value modifies the COGO attribute values and line geometry as described in the following table:

   Typed line length value	Straight lines	Circular arcs
   Positive values	Direction is preserved. A proportional scale factor is calculated by dividing the current geometry length by the stored Distance value. Distance is set to the specified value. Line geometry length is updated to be the specified value multiplied by the proportional scale factor.	Direction is recalculated. Radius is preserved. A proportional scale factor is calculated by dividing the current geometry length by the current ArcLength value. ArcLength is updated to a specified value. Line geometry length is updated to be the specified value multiplied by the proportional scale factor.
   Negative values	Direction is preserved. A proportional scale factor is calculated by dividing the current geometry length by the stored Distance value. Distance is recalculated. It is updated to be the current COGO distance minus the specified length. Line geometry length is updated to be (the current geometry length) minus (the specified length multiplied by the proportional scale factor).	Direction is recalculated. Radius is preserved. ArcLength is recalculated. It is updated to the current COGO value minus the specified length. Circular arc geometry length is updated to be (the current geometry length) minus (the specified length multiplied by the proportional scale factor).

9. Click the Change Length box, type the line length, choose the units, and press Enter.

   When you press Enter, the selected line feature is modified and the Finish command automatically runs.