Input H

The table with the input data of horizontal geometry forms the base for the alignment calculation in NADB.

Customize the user interface by minimizing the number of tabs (Input H/V, Result H/V, Errors H/V, etc.) to be displayed in the user interface using the dialog Options.
- Double click any tab (Input H/V, Result H/V, Errors H/V, Ref. Points, History, etc.) of the user interface to open the dialog Options.
Customize the user interface by turning off any of the columns Parameter, End Radius, and all the columns of Coordinates in Input H (E1, N1, E2, and N2) using the dialog Options.
- Double click any column heading of the tab Input H or Input V of the user interface to open the dialog Options.
Every line in the table represents an element in the alignment and the first line is always the first element.
A common feature for all the tables is that the cells containing no input data are grey.

Every element in the alignment is numbered in the calculation order in a consecutive fashion.
The element number can be edited by writing a new number in the number area.
The elements are renumbered automatically, but the requirement is that it is a positive number.

There are three different element types: line, arc, and transition (clothoid).
These elements can be combined in a number of different combinations, but not all combinations allow for a successful calculation.
The different elements have colors that correspond with the colors of the design line (alignment on CAD drawing).

Fixed - The element(s) extension is going between two determined fixed points (draggable).
Partly Fixed - The element(s) extension is going through one determined fixed point (rotate able).
Approximate - Floating element i.e. no fixed points on the element. Set radius and bordering elements determine the element's placement. The approximate point, which is declared by (x1, y1) is used in these cases where two mathematical solutions are present. The solution, which places the alignment closest to the approximate points, is chosen.
Approximate Radius - Only applicable for arcs. An arc is fixed in a declared fixed point and the arc's radius is calculated as a result of this.
Length - An element decided by the length. Assign the element's length in the column for length.
For more details, refer to Segment Classification.

This column displays the radian value of an element, like Arcs.
If the element is a transition (clothoid) this is displayed in the transitions (clothoid) starting radius.

This column displays the length of the element at the time where this was input data for this element, in other cases, refer to Parameter below.

Transition curve parameter (A).
The transition element, clothoid, is represented by the parameter A.
The formula for the clothoid is A^2=L*R.
L = Clothoids length and R = Resulting radian.
From the formula, it is evident that A and L is two sides to the same thing, and that theoretically it is possible to use parameters or length for one specific clothoid. In relation to road design, the parameters are used to describe the clothoid.

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