Leica Captivate, Техническое справочное руководство

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44 Roads - Alignment Editor
44.1 Basic Terms
A road surface can be thought of three different types of design elements:
• the horizontal alignment
• the vertical alignment
• the cross section
TS_051
A’
A’’’
B’
B’’
a b c
A’’
B’’’
a - Natural surface.
b - The vertical alignment.
c - The horizontal alignment.
A’’/B’’ - Points on horizontal alignment
A’/B’ - Points on real surface
A’’’/B’’’ - Points on vertical alignment
Any point A in a project has ENH coordinates in a determined coordinate sys-
tem. Each point has three different positions:
• A’ - Point on real surface
• A’’ - Point on horizontal alignment
• A’’’- Point on vertical alignment
By adding a second point B to the project an alignment is defined. The align-
ment can be thought in three ways:
•
Horizontal alignment (A’’-B’’)
•
Projection of the horizontal alignment onto the real surface (A’-B’)
•
Vertical alignment (A’’’-B’’’)
The angle between the horizontal and the vertical alignment is the grade ( a ).
A road design is fitted to a base plan or map using the three basic geometric
elements:
• Straight
• Curve
• Spiral
Refer to "I Glossary" for a definition of the terms.
Description
Basic concepts
Geometric elements
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704 Roads - Alignment Editor