Edit vertex m-values

The Edit Vertices tool 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 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 .
2. Expand Reshape and click Vertices .
3. In the pane, click Select , and select a polyline or polygon feature.
   • To refine the selection, right-click a feature in the tree view, and click Unselect or Only Select This .

     

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 .

     

5. To finish the feature, right-click and click 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 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 .
2. Expand Reshape and click Vertices .
3. In the pane, click Select , and select a polyline or polygon feature.
   • To refine the selection, right-click a feature in the tree view, and click Unselect or Only Select This .

     

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

   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	Multiplies all m-values by a specified Factor value.
   Offset	Sums each m-value with a specified Offset value.
   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	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	Assigns the specified From and To m-values to the start and end of the feature, respectively.
   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 , or press the F2 key.