Linear segment details

You use the Linear Segment Details section to locate a linear segment or point on a linear asset. The Linear Segment Details section, which displays on tabs in several applications, appears only if you are working with a linear asset.

For example, if you specify a linear asset in the Asset field on a preventive maintenance record, the PM tab displays a Linear Segment Details section. If you enter a point asset, the PM tab does not display this section. The Linear Segment Details section includes fields for both the start point and the end point. If you locate a point, such as a stop sign, the start and the end points are the same.

The following terms are associated with linear segments:
Measure
The absolute distance from the start of a linear asset. You can specify a measure manually. The measure is calculated for you if you enter a reference point and a reference point offset. In the example, using Mile Post 27 and an offset of -528, the calculated measure is 26.9 miles (528 feet = .1 mile).
Offset
A measure from a previously defined reference point. The possible kinds of offsets are the following:
Reference Point Offset
The distance before or after the reference point. Specify an offset value if the segment start or end is before or after the reference point. The value can be negative (before) or positive (after). For example, if the start of the segment is 528 feet before Mile Post 27, type -528.
You cannot specify an offset that, when combined with the reference point, yields a measure that is outside the boundaries of the linear asset. For example, if reference point Mile Post 1 is at 1.0 miles on a linear asset that begins at 0.0 miles, you cannot enter an offset of -2 miles.
Y-Offset
A distance perpendicular to the direction of the linear asset. For example, a speed limit sign is located 10 feet from the right edge of the road. "Right" is positive and "left" is negative. Therefore, the Y offset is 10.
Z-Offset
A distance above a linear asset or below a linear asset. For example, an exit sign is located 18 feet above the surface of the road, and a culvert is 4 feet below the surface of the road. The Z offset for the sign is 18, and the Z Offset for the culvert is -4.
Reference point
A feature instance that you can use as a starting point or as an ending point for a linear segment. A reference point is a means of communicating a work location. For example, it can be more useful to workers to say that roadside plowing on Route 96 begins at the intersection of Routes 96 and 75, and ends at Exit 34. It would be less useful to say the work begins at Mile 27.85 and ends at Mile 33.8.
The use of reference points varies according to department practices and to individual variation among linear assets. Some roads might have accurate and persistent mile post markers and workers can rely on them to locate work. Other roads might have few markers or no accurate markers, and users can rely on reference points. Use labels that maintenance workers in the field can easily identify.
Click Select Value to select the reference point.
Y Reference
The point from which the Y Offset is measured.
The system administrator creates the set of Y Reference values by creating a domain in the Domains application. For roads, some common examples include midline, outer pavement edge, and inner pavement edge. For example, a stop sign is located not just 20 feet from a road, but 20 feet from the midline of a road.
Z Reference
The point from which the Z Offset is measured.
The system administrator creates the set of Z Reference values by creating a domain in the Domains application. For roads, some common examples include road surface and road bed. For example, an exit sign is located 18 feet above the road surface, or a culvert is 12 feet below the road bed.


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