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Point PT
Para A2
Para A1
Radius R
Next point
Former point
‗PT‘ is the intersection point of road. The ―x‖ of ―Px‖ is the
number of intersection point.
When inputting R,A1, and A2, they can‘t be negative. If
inputting the radius, the system will insert an arc with defined radius
in between the former point and the next point. If inputting
parameters A1 and A2 of the spiral, the system will insert defined
spiral between the line and the arc.
[Notes*]: When inputting A1 and A2 according to the length L1
and L2
of the spiral, the formula to calculate A1 and A2 are as
followed:
Radius
L
A
Radius
L
A
2
2
1
1
Press [ENT] to input the next intersection point after inputting. If
the ‗N‘, ―E‖, ―Z‖ column s are null, the key [ENT] is invalid. After
finishing inputting, press [ESC] to exit, then enter the interface of
―List of H curve‖;
Press [View], then you can view the data input and edit data;
Press [Add], then you can continue alignment. Repeat the steps
above until complete the input.
After complete the horizontal alignment, return to the
―Roadway‖ menu, if you want to continue alignment, select ―Resume
H curve‖;
10.1.2 Vertical alignment
Vertical alignment is formed by a group of intersection points.
The intersection points include mileage, altitude and curve length.
The beginning and ending point of the curve length must be zero
and the number of the intersection points can‘t be more than 20 under
the vertical alignment.
