Spectra-precision FAST Survey Reference Manual Manual do Utilizador descarregar pdf (Página 227)

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the northing and easting for the start of the centerline. It is not necessary to enter the northing and easting if you use

the

Pick PL

(pick polyline) option for defining a centerline, since the starting coordinates of the selected polyline

are automatically used, and would overwrite anything previously entered.



Load

: This command allows you to load an existing centerline for review or edit.



Edit:

Use this button to edit the highlighted element.



Delete:

Use this button to remove the highlighted element.



Add

: Returning to the starting dialog, you can add elements to get a centerline started. Typically, you will start

with a line or tangent segment, but you can also start on a curve or spiral curve element. When you select

Add

you get to choose which element to use. These options include:



Add (Line):

A tangent section of the alignment. This option allows you to enter a point ID or coordinates to define

the end of the tangent, or enter the station, or distance and the direction. To force the element to be tangent to the

previous element, toggle on the

Tangential to the previous elem

option. This will gray out the direction field and

will compute the tangent direction and enter it for you.



Add (Curve):

A typical circular curve section of the alignment. The first element of the curve defines what the

options for the second element can be (See Lists Below). The

toggle allows the user to use Railroad definitions.

The

Review

button allows you to verify the Tangent In and Tangent Out bearings or azimuths (depending on Job

Settings, Format, Angle Display settings), as well as confirm PC and PT coordinates. For example, this allows you

to verify computed Tangent Out bearings against paper plans, before continuing entry of new elements.

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Spectra-precision FAST Survey Reference Manual Manual do Utilizador Página 227