Point event offset
Characteristics of a route can be represented as a point event located by using an offset distance from an existing point feature. The reference offset data is translated to routes and measures for storage. As shown in the example below, imagine the route has the From and To measure values of 0 and 12 miles, respectively. The Measure of the event is located at a distance of 6 miles toward the right from an existing point feature.
If the calibration direction of the route was from right to left, the offset distance would have been calculated in the reverse direction (from left to right). In that case, the offset distance would have been shown with a negative number.
- Open Event Editor and, if prompted, sign in to Portal for ArcGIS or ArcGIS Online.
- Click the Edit tab.
- In the Edit Events group, click the Point Events button .
The Add Point Events dialog box appears.
If there are no editable point event layers, the dialog box is disabled.
- Click the Event Layer drop-down arrow and choose an event layer to edit.
- In the Location section, click the Method drop-down arrow and choose Anomaly Offset (Point Event layer name with offset suffix).
All the point event layers that are published with the map service and are registered with the chosen network appear in the drop-down list.
- Provide the Offset value for the reference offset using any one of these options:
- Select the direction of the offset by clicking the Direction drop-down arrow, typing the offset value, and selecting the units.
- Type the value and select the units.
- Click the Select an Offset Location on the Map tool and pick a location along the route on the map.
A red cross is placed at the offset location along the route on the map. This is the location of the Measure value for the event.
- This value denotes the distance between the chosen point event and the proposed Measure on the selected route.
- The direction is an optional selection.
- If no direction is selected, a positive offset value will place the Measure location along the direction of calibration from the selected point feature.
- If no direction is selected, a negative offset value will place the Measure location opposite the direction of calibration from the selected point feature.
- The new event will be associated with the route (route name) from the LRS Network that the event location intersects. In cases where the input location intersection may have more than one route in the registered LRS Network (overlapping routes), a dialog box prompts you to choose which route you prefer the event to be associated with.
- If you type the Measure value, you can select the unit for that value using the drop-down arrow. The Measure value will be converted into the LRS units before saving the newly added events. For example, the LRS is in miles and you have entered 528 feet as the Measure value. The newly added events will have a Measure value of 0.1 miles because 528 feet equals 0.1 miles.
- Choose the date that will define the start date of the event.
- Click the Start Date drop-down arrow to choose the start date using a calendar.
- Check the Use route start date check box to use the start date of the routes.
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.
- Click Next to view the Attribute-Value table. This table contains all the attributes of the event layer. Fill out all the attribute information for the new event in this table. Check the Show network name check box to see which LRS Network the selected event layer is associated with.The attribute table appears.
- Click Save.
The point event is saved in the database.