SLT12 User Manual
130
Figure 11- 10
Involving virtual intersection and turn-back (turning more than 180 degrees) curves, in addition to the line
element method can be supported, in the intersection method, the corresponding virtual intersection point switch
is supported.
The first point of the virtual intersection combination is entered normally, and the second point is entered by
checking "special intersection" and turning on the virtual intersection switch.
Figure 11- 11
Line element method
The line element legal line is also called the building block legal line, which is a combination of complex
highway plane lines "whole into zero" decomposition into several line units. If the starting point information of
the route plane curve is known, such as coordinates, tangent direction, and radius of curvature, any unit is set up
from the starting point and extended in any direction, and the information at the end of this unit, such as
coordinates, tangent azimuth, and curve radius, can be calculated, and at the same time, the same information is
used as the starting point of the next unit. This is calculated unit by unit downward, just like building blocks.
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