Edit vertex m-values

The Edit Vertices tool edits m-values in its geometry properties table. You can also right-click a vertex or a segment while editing an m-aware line feature and recalculate all m-values with commands on the context menu. This tool is available in the Modify Features pane.

M-values are a geometric property of a polyline feature. They are used to store time, distances, or other measurements along a linear path in a route network. M-values are interpolated from 2D line length; 3D line geometry is not considered when using the m-value commands.

For steps to update m-values from two or more calibration points, see Calibrate a selected route.

Note:

The M property is added to a feature class when a feature class is created. If it doesn’t appear in the geometry properties table, create a feature class and check the M Value check box in the Geometric Properties section of the Create Feature Class dialog box.

After creating the feature class and adding it to a map, you can use Paste Special to copy features to the m-aware feature layer.

To edit m-values for an m-aware line feature or recalculate m-values using commands on the context menu, 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. On the ribbon, click the Edit tab. In the Features group, click Modify .
3. Click Edit Vertices in the Modify Features pane.

   To find the tool, expand Reshape, or type Vertices in the Search text box.

4. Click the Change the selection tool in the tool pane and select a polyline or polygon 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, and click Only Select This .

   Note:

   If 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 highlights as a sketch in the map and its geometric properties appear in the geometry properties table.

   

5. Click the m-value attribute field, type the m-value, and press the Enter key.

   To select and apply the same m-value to multiple vertices, press the Ctrl key, and select the vertex rows in the geometry table. Click Update M Values on the toolbar, type the value in the dialog box, and press the Enter key.

   

6. To recalculate m-values for the selected line feature, right-click a vertex or segment, click M Value and choose the command.

   Note:

   M value commands are disabled if an m-aware feature contains undefined m-values appearing as NaN in the tool pane geometry properties table.

   The following commands are available when the pointer changes to the vertex directional cursor or the segment cursor .

   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.

   Note:

   Enable vertex editing on the segment construction toolbar to make the M value commands available on the context menu when creating feature geometry.

   

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