Adding linear events by coordinate location

Characteristics of a route such as speed limit or functional class can be represented as a linear event with starting and ending measure information along the route. The Line Events tool provides an interface to add linear events by typing or selecting their x- and y-coordinates. You can also use reference offset data to add events to a route. The reference offset data is translated to routes and measures for storage.

Remarque :

In cases where events are being modified on a route and you want to see the previous events on the route at that location, don't use the Add Linear Event widget. Instead, edit events in the Event Selection table or the Attribute Set Selection table. If this method is used, you can see what was previously on the routes at the specified measures.

1. Open Event Editor and, if prompted, sign in to Portal for ArcGIS or ArcGIS Online.
2. Click the Edit tab.
3. In the Edit Events group, click the Line Events button .

   The Add Linear Events widget appears.

   Remarque :

   The selections for the network to and from method and measure can be configured in advance when configuring, creating, or editing the default settings for attribute sets.

   Learn more about configuring and creating and editing default settings for attribute sets.

4. Click the Network drop-down arrow and choose the network that will serve as a source linear referencing method (LRM) for defining the input measures for the new events.
5. Choose the name of the line feature on which the events will be located using one of the following options:
   • Click the drop-down arrow to choose the line name in the Line Name text box.
   • Click the Select a Line on the Map tool and select the line from the map.

   Astuce:

   If the selected line is not in the active view of the map, click the Zoom to the line extent or center on the line start or end point on the Map button to refresh the map display to zoom in to the entire extent of the selected line.

   The line is highlighted in light blue. The arrow at the end shows the direction of calibration of the line.

6. In the From section, click the Method drop-down arrow and click Coordinates.

   The Coordinate System section appears.

   

7. Optionally type a value in the GC Factor text box.

   This will adjust the coordinates by dividing X and Y by the value specified.

8. Specify a spatial reference by choosing an option from the Spatial Reference drop-down menu.
   • LRS Spatial Reference—The spatial reference of your LRS network
   • Web Map Spatial Reference—The spatial reference of your basemap
   • GCS_WGS_1984—A geographic spatial reference using units of degrees

   Additionally, you can configure different coordinate systems by specifying the well-known ID (WKID) or well-known text (WKT) in the configuration file of your Event Editor.

   Learn more about configuring the Event Editor web app.

9. In the From section, click the Method drop-down arrow and choose Coordinates.
10. Input the x- and y-coordinate values for X and Y.

    Astuce:

    You can select a coordinate by using the Select an X/Y Location on the Map button .

    The route measure closest to the original coordinates will be selected and its distance from the route will be displayed.

    

11. Choose the route name in the To section using any of the following options:
    • Click the Route Name drop-down arrow and choose the route.
    • Type a route name in the Route Name text box.
    • Click the Select a Route on the Map tool and select the route from the map.

    Astuce:

    If the selected route is not in the active view of the map, click the Zoom to the route extent or center on the route start or end point on the Map button to refresh the map display to zoom in to the entire extent of the selected line.

12. In the To section, click the Method drop-down arrow and choose Coordinates.
13. Input the x- and y-coordinate values for X and Y.

    Astuce:

    You can select a coordinate by using the Select an X/Y Location on the Map button .

    The route measure closest to the original coordinates will be selected, and its distance from the route will be displayed.

    

14. Choose the date that will define the start date of the events by doing one of the following:
    • Type the start date in the Start Date text box.
    • Click the Start Date drop-down arrow and choose the start date.

    The start date defaults to today's date, but you can choose a different date using the date picker. The end date is optional, and if it is not provided, the event remains valid now and into the future.

    Remarque :

    If you configured your instance of Event Editor to not allow dates prior to the start date of the route, and you enter a date prior to the start date of the selected route in Start Date, a warning message appears alerting you to choose a date on or after the start date of the selected route.

15. Choose the date that will define the end date of the events by doing one of the following:
    • Type the end date in the End Date text box.
    • Click the End Date drop-down arrow and choose the end date.
16. Choose from the following data validation options to prevent erroneous input while characterizing a route with linear events:
    • Retire overlaps—The system adjusts the measure and start and end dates of existing events in such a way that the new event does not cause an overlap with respect to time and measure values.

      

    • Merge coincident events—When all attribute values for a new event are exactly the same as an existing event, and if the new event is adjacent to or overlapping the existing event in terms of measure values, the new event is merged into the existing event and the measure range is expanded accordingly.

      

    • Prevent measures not on route—This data validation option ensures that the input measure values for from measure and to measure values fall in the minimum and maximum range of measure values on the selected route.
17. Click Next.

    The tab showing the attribute set for the events appears. The event fields are shown under the G1 attribute group.

    Remarque :

    You can use the check boxes to add data for specific events in the attribute set. No records are added for the unchecked events. As shown in the example below, no records are added to the County_A and City_A events.

18. Choose attribute information for the new event using the following options:
    • Type the attribute information for the new event in the tables defined by attribute sets.
    • Click the Copy Attribute Values button and click a route on the map to copy event attributes from another route.

    Event Editor uses a default attribute set on the Edit tab. You can modify the attribute set to create custom attribute sets or use the administrator-configured attribute set.

    Remarque :

    Coded values, range domains, and subtypes are supported when configured for any field in the Attribute-Value table.

19. Use the following options to access more information on the attribute set:
    • Check the Show network name check box to show the LRS Network associated with the selected event layer.
    • The list of attributes in the tables defined by attribute sets can be from more than one event layer. If you want to identify the source event layer for each attribute, check the Show layer names check box.
    • Checking the Go to the next measure upon save check box results in prepopulating the From measure value using the to measure value of the present section to continue the event creation process. For example, this will occur if events are created on the route using a From measure value of 0 miles and a to measure value of 0.289 miles. If you click Save with this option checked on the Attribute Set tab, the Add Linear Events widget is prepopulated with the value of 0.289 miles as the from measure value for the new events.
20. Click Save.

    The new linear events are created and appear on the map. A confirmation message appears at the lower right once the newly added line events are saved.

After an event has been successfully created, you have the following two options to continue characterizing the route:

• Click New Edit to clear all the input entries in the widget and restore the default values from the geodatabase to the attribute table.
• Click Next Edit to retain all the existing entries in the widget and the attribute table for the convenience of quick editing of similar characteristics.