Populating attributes with m-values

In instances where route features do not have from- and to-measure fields populated, you can update them using the LRS Convert Measures To Attributes tool. This tool copies the first m-value and last m-value into fields on the route feature. This allows you to store the starting and ending points for the route features relative to their positions on an entire route. For example, if you have a route that represents a section of Interstate 10, the starting value is not necessarily going to be 0, and the ending value does not represent the end of the freeway.

The m-values can be copied to two fields of type double on the route feature class.

Exporting m-enabled data from the geodatabase to other data formats may remove the measure values in the geometry. Storing the starting and ending measures as attributes on the route ensures that events can still be referenced to the route when using other data formats.

Examples of starting and ending m-values for a route that have been copied to the Start and End fields on the route feature
步骤:
  1. Start ArcMap.
    提示提示:

    If the ArcMap - Getting Started dialog box appears, you can open a new or existing map document. You can also check the Do not show this dialog box in the future check box and click Open.

  2. Load route features in the map or open an existing map document.
  3. On the main menu, click Customize > Toolbars > Production Linear Referencing.
  4. On the main menu, click Customize > Toolbars > Production Editing.
  5. Click the Production Start Editing button Production Start Editing on the Production Editing toolbar.
    注意注意:

    The Manage Features and Create Attributes, Update Attributes, or Metadata Attributes windows automatically appear when you start an edit session using the Production Start Editing tool.

    提示提示:

    If the Create Attributes, Update Attributes, or Metadata Attributes window does not appear when you start an edit session, click the Link Feature Manager To Attributes Window button Show/Hide Attributes on the Manage Features window.

  6. If necessary, enable classic snapping on the Production Editing toolbar by clicking Production Editing > Use Classic Snapping.
  7. 注意注意:

    You can make the route layer the only selectable layer by clicking the List By Selection button 按选择列出 on the table of contents, then right-clicking the route layer and choosing Make This the Only Selectable Layer.

  8. Select one or more features from the route layer using the Select tool 选择要素 on the Tools toolbar or the Edit tool Edit on the Production Editing toolbar.
  9. Click the LRS Convert Measures To Attributes button LRS Convert Measure to Attributes on the Production Linear Referencing toolbar.

    The Convert Ms To Attributes dialog box appears.

    注意注意:

    This dialog box does not appear if the route feature class does not have two fields of type double that can accept the measure values.

    Convert Ms To Attributes dialog box
  10. Click the From Measure Field drop-down arrow and choose the field you want to populate with the starting m-value.
  11. Click the To Measure Field drop-down arrow and choose the field you want to populate with the ending m-value.
  12. Click OK.

The measure values for the selected line features are copied to the specified fields on the route feature class.

提示提示:

You can see the from- and to-measure values on the feature by choosing it on the Update tab on the Manage Features window.


9/23/2010