To Create a Survey Observation by Deflection Angle and Distance

Use the deflection distance (DD) command to quickly create a point using a deflection angle and distance from an established line.

The term deflection angle refers to the angular direction turned from the extension of the previous course. Additionally, you can also use a vertical angle or vertical distance to locate the point.

To create an observation using deflection angle and distance, using the command language

1. In Toolspace, on the Survey tab, right-click the network that you want to add points to, and click Survey Command Window.
2. At the Command line, enter:

   DD (point) [angle] [distance] (description)

To create an observation using deflection angle, distance, and vertical angle, using the command language

1. In Toolspace, on the Survey tab, right-click the network that you want to add points to, and click Survey Command Window.
2. At the Command line, enter:

   DD VA (point) [angle] [distance] [vertical angle] (description)

To create an observation using deflection angle, distance, and vertical distance, using the command language

1. In Toolspace, on the Survey tab, right-click the network that you want to add points to, and click Survey Command Window.
2. At the Command line, enter:

   DD VD (point) [angle] [distance] [vertical distance] (description)

Examples

The following example illustrates using the deflection distance command.

NE 1 100 100

STN 1

AZ 1 2 100

BS 2

DD 3 85.2657 60.960

! AZIMUTH: 385.2657 DISTANCE: 60.9600

! POINT 3 NORTH: 159.3345 EAST: 86.0167

! ELEV: <Null>

Points created using the DD command:

Point 3 is located by turning a deflected angle of 85.2657 right from the extension of the backsight line at a distance of 200. Angles and distances are in the current units, unless you type a qualifying suffix.

Command Syntax

DD (point) [angle] [distance] (description)

or

DD VA (point) [angle] [distance] [vertical angle] (description)

or

DD VD (point) [angle] [distance] [vertical distance] (description)

Parameter	Definition
point	The point identifier of the new point. You do not need to assign a point number if auto point numbering is on.
angle	The deflection angle as measured to the point. Type this value in the current angular units (DMS, grads, decimal degrees, radians, or mils).
distance	The distance from the instrument point to the point being located. It is measured in the current units unless otherwise specified. The distance is assumed to be a horizontal distance unless VA is used. When VA is used, the distance is recognized as a slope distance.
vertical angle	The direction of the vertical angle (zenith, horizontal, or nadir). Type this value in the current angular units (DMS, grads, decimal degrees, mils, or radians).
vertical distance	The elevation difference from the instrument to the prism. If the prism is higher than the instrument, then this is a positive value.
description	An optional description associated with the point.