Using stationing to locate measures
Stationing is the fundamental system of measurement used for road pipeline layout and construction. Stations are reference points that are placed along the horizontal measurement of a route centerline or a baseline at some regular interval. Generally, the distance between two adjoining stations along a route is 100 feet. The first station located at the beginning of the baseline is 0+00, and the next station located 100 feet from it is 1+00. Therefore, a station number of 10+34.05 denotes 1,034.05 feet (10*100 + 34.05) from the starting station.
The station numbers increase from west to east or south to north based on the cardinal direction of the overall pipeline. For pipeline projects, a starting reference station is first established, and then all distances along the route centerline are measured from that point location. You can add event data to routes by entering station numbers in the Point Events tool interface. The station data is translated to routes and measures for storage.
You can use the stationing data as an input for adding point events by using these three scenarios:
- Create a starting or base station on the route and enter the station values as an offset from that station.
- Identify a starting or base station on the route and enter the station values as an offset from that location.
- Use the existing stations on the route to calculate or enter the measures in the form of station values.
Using the existing stations on the route to calculate the measures
You can use this method when stations exist on the route. The measures are calculated using the location and values of the existing stations. This functionality is available only for the LRS Networks that contain a Stationing event layer.
In the following example, there are three existing stations on the route. Stations A, B, and C have station values of 00+00.00, 50+00.00, and 100+00.00. respectively. The stations increase in value following the direction of calibration of the route, which is from left to right on the map. The measures on the route are located by taking these three stations into consideration. Therefore, the measure of the event (station value 82+18.27) is located nearer to the third station—that is, 100+00.00 between the second and the third stations.
- 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 unavailable.
- Click the Event Layer drop-down arrow and choose an event layer to edit.
- In the Location section, click theMethod drop-down arrow and choose Stationing.
- Click the drop-down arrow and choose the units for station values.
- Provide the Station number using any one of these options to allot the Measure for the event:
- Click the Select a Location on the Map tool , and click a location on the selected route. The station number is derived from the route.
- Type the station number.
A red cross appears at the selected location on the map.
- 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.