Edit vertex m-values

The Edit Vertices tool includes commands to edit vertex m-values stored on polylineZM features. This tool is available in the Modify Features pane.

When you edit vertex m-values, consider the following:

• You can edit m-values individually or for multiple vertices, or recalculate m-values along an entire feature.
• Linear referencing systems use m-values to store information about route measures. The m-value attribute field must be enabled when you initially create a feature class.

Clear or edit m-values in the pane

To clear or edit m-values, select a polylineZM feature, click the row or rows in the geometry properties table for the selected feature, and click Update M Values on the toolbar.

When you edit m-values in the pane, consider the following:

• Cleared values appear as the numeric property NaN, representing a value that is not a number.
• To edit an m-value directly, click the attribute field and type the value, or press Backspace or Delete to clear it.

1. In the Contents pane, confirm that the layers can be edited and are visible.

   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. On the ribbon, click the Edit tab. In the Features group, click Modify .
3. In the Modify Features pane, expand Reshape and click Vertices .
4. In the pane, click the Select tool and select the feature.
   1. If you selected more than one feature, right-click the feature in the pane selection tree view and click the appropriate command described in the following table:

      Command	Description
      Only Select This .	Keep the selected feature and remove all others from the selection.
      Unselect .	Remove the selected feature from the selection.

5. In the geometry properties table, click the row or rows for each vertex to be edited.

   To select multiple rows, use the shortcut keys described in the following table:

   Method	Description
   Press Ctrl and click the rows.	Apply the same value to a field that is common to several selected features.
   Press Shift and click the first and last row in the sequence.	Apply the same value to a field that is common to a range of selected features.

6. On the geometry properties toolbar, click Update M Values .

   

7. On the M Value dialog box, specify the m-value to apply to the selected vertices.

   Clear M Values	Clear the m-values for the selected vertices.
   Enter an M Value	Apply the specified m-value to the selected vertices.

8. Click OK to apply your changes.
9. To finish the feature, right-click and click Finish , or press the F2 key.

Recalculate m-values

To recalculate m-values, select a polylineZM feature, right-click a segment, and click the corresponding command.

When you recalculate m-values, consider the following:

• To recalculate m-values while creating a feature using a construction tool, click Vertex Editing on the construction toolbar to enable vertex editing.
• To recalculate m-values using calibration points, use the Calibrate Route tool .

1. In the Contents pane, confirm that the layers can be edited and are visible.

   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. On the ribbon, click the Edit tab. In the Features group, click Modify .
3. In the Modify Features pane, expand Reshape and click Vertices .
4. In the pane, click the Select tool and select the feature.
   1. If you selected more than one feature, right-click the feature in the pane selection tree view and click the appropriate command described in the following table:

      Command	Description
      Only Select This .	Keep the selected feature and remove all others from the selection.
      Unselect .	Remove the selected feature from the selection.

5. Right-click a segment, click M Value, and click the corresponding command.

   Insert Vertex At M	Insert a vertex at a specified Measure value in the same direction in which the m-values are increasing.
   Apply Factor	Multiply all m-values by a specified Factor value.
   Offset	Sum each m-value with a specified Offset value.
   Calculate NaN	Replace all unknown (NaN) m-values with a value that is interpolated or extrapolated from existing m-values.
   Drop Measures	Reset all m-values to unknown (NaN).
   Set As Distance	Assign m-values to all vertices starting with a specified Starting M value and interpolating the remaining values across the geometry length of the feature.
   Set From/To	Assign the specified From and To m-values to the start and end of the feature, respectively.
   Set Direction As M	Change the geometry direction to match the direction in which the m-values are increasing.

6. Click Finish , or press the F2 key to finish the feature.