Earth Grading¶
Use this dialog to define fill surfaces to be placed on top of the regular road surface, or cut surfaces to indicate that part of the side terrain should be leveled. Examples of use include building noise barriers and leveling side terrain.
Where to Find the Dialog¶
In the toolbox, select SFI Properties..., go to the Road Body tab, and open the Side Area table.
Using the Dialog¶
The dialog consists of two tables used to define and describe earth grading.
Upper Table¶
The upper table is used to define the stretches with earth grading and how they start and end.
Stretches¶
Stretches with earth grading are defined with a start and end profile. Between two profiles, the values are interpolated linearly. A new profile must be defined each time the earth grading changes.
Start Point for Earth Grading¶
The start point for earth grading can be defined using the following methods:
- Height (absolute)
The program uses the first surface outside the shoulder edge that intersects with this height.
- Vertical distance from centerline
Figure: A = Earth grading, B = Distance
The program uses the first surface outside the shoulder edge that intersects with this height.
- Horizontal distance from centerline
Figure: A = Earth grading, B = Distance
The program uses the first surface outside the shoulder edge that intersects with this distance.
- Outer edge of any road surface
End Point for Earth Grading¶
The end point for earth grading can be specified in two ways:
- First intersection with the terrain
Figure: 1-3 = Surface 1-3, A = Earth grading
- Last surface's intersection with the terrain
Figure: 1-3 = Surface 1-3, A = Earth grading
Start Value¶
You must specify a value for the start point of the earth grading. Horizontal distance from the centerline is given in meters and must be positive. The start point must be outside the shoulder edge.
Note
The exception is when you specify the outer edge of any surface. Here, the start point is uniquely defined by the surface's location.
Lower Table¶
The lower table is used to describe the surfaces. The construction of the earth grading is described sequentially with surfaces (1, 2, 3, etc.) outward from the start point. The surfaces are described with width and slope. Normally, only the type Width and Slope is used.
Width¶
The width is given in meters. Width can also be set as undefined (-) for the outermost surface.
Slope¶
Slope is given as a ratio, i.e., 1:1 is given as 1.0 and 1:2 as 0.5. The sign indicates whether the slope goes upward or downward. A negative value for slope means downward relative to the horizontal plane.
Import from Other Systems¶
VIPS Import¶
The import reads the contents of the VIPS table: Earth Grading.