Edit vertex m-values

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

You can edit m-values individually, apply the same value to multiple vertices, or recalculate m-values along an entire route feature. To calibrate a selected route, use the Calibrate Route tool.

Note:

The m-value field is a property of a feature class that is enabled when a feature class is initially created.

Linear referencing systems (LRS) use routes, created as PolylineZM features with m-values, to model linear distances and related events independent of the line geometry.

Clear or edit m-values in the pane

To clear or edit m-values in the geometry properties table, click the individual fields. To apply the same values to multiple rows, select the rows and click Update M Values.

  1. On the Edit tab, choose your snapping preferences, and show the Modify Features pane.
    1. In the Snapping group, click the Snapping drop-down menu List By Snapping and enable your snapping preferences.

      To temporarily turn snapping off while you edit a feature, press and hold the Spacebar.

    2. In the Features group, click Modify Modify Features.
  2. Expand Reshape and click Vertices Edit Vertices.
  3. In the pane, click Select Active Select, and select a polyline or polygon feature.
    • To refine the selection, right-click a feature in the tree view, and click Unselect Clear Selected or Only Select This List By Selection.
      Context menu
  4. Clear or edit m-values in the geometry properties table.
    • To clear an m-value and set it to NaN, click the field and press Backspace or Delete.
    • To apply the same value to multiple vertices, select the rows, and click Update M Values Edit M-Value.

      M Value window

  5. To finish the feature, right-click and click Finish Finish, or press the F2 key.

Recalculate m-values

To recalculate m-values along an entire route feature, right-click a segment and click the corresponding command.

  1. On the Edit tab, choose your snapping preferences, and show the Modify Features pane.
    1. In the Snapping group, click the Snapping drop-down menu List By Snapping and enable your snapping preferences.

      To temporarily turn snapping off while you edit a feature, press and hold the Spacebar.

    2. In the Features group, click Modify Modify Features.
  2. Expand Reshape and click Vertices Edit Vertices.
  3. In the pane, click Select Active Select, and select a polyline or polygon feature.
    • To refine the selection, right-click a feature in the tree view, and click Unselect Clear Selected or Only Select This List By Selection.
      Context menu
  4. Right-click a segment, click M Value, and click the corresponding command.

    Insert Vertex At M Insert Vertex At M

    Inserts a vertex at a specified Measure value in the same direction in which the m-values are increasing.

    Apply Factor Apply Factor

    Multiplies all m-values by a specified Factor value.

    Offset Offset

    Sums each m-value with a specified Offset value.

    Calculate NaN Calculate NaN

    Replaces all unknown (NaN) m-values with a value that is interpolated or extrapolated from existing m-values.

    Drop Measures

    Resets all m-values to unknown (NaN).

    Set As Distance Set As Distance

    Assigns 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 Set From/To

    Assigns the specified From and To m-values to the start and end of the feature, respectively.

    Set Direction As M Set Direction As M

    Flips the geometry direction to match the direction in which the m-values are increasing.

  5. To finish the feature, right-click and click Finish Finish, or press the F2 key.