Offset shots, Distance offset screen – Spectra Precision Survey Pro v4.6 Ranger User Manual User Manual

Page 143

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Other Conventional Surveying Tutorials

133

Offset Shots

Three individual screens are used to perform offset shots. These
include the Distance Offset screen, Horizontal Angle Offset screen,

and Vertical Angle Offset screen.
Offset shots are generally performed to compute coordinates for
points that cannot easily be occupied by the rod. The offset routine

that you choose will depend on your situation. Each routine is

explained below.

Distance Offset Screen

The Distance Offset screen will result in the

storage of a point that is located at a specified
horizontal and/or vertical distance away from

the current rod location.
The routine requires independent horizontal
and vertical distances (offsets) that are applied

to a shot from the rod location.
In the example below, a point is stored that is 3
feet to the right of the prism and 1 foot behind

the prism from the point of view of the total

station.

1. From the Main Menu, tap

.

Survey , Distance Offset . If you have

not already setup your backsight, you will need to do so before the

Distance Offset Shot screen will open.

2. The rod person should measure the horizontal and / or

vertical distance to the new point from the rod position.
Horizontal measurements should be taken parallel and / or

perpendicular to the line between the total station and the

rod.

3. If the new point is to the left or right of the rod location,

enter the perpendicular offset distance in the Offset field

and select L if the new point is on the left side, or R to if
the new point in on the right side (from the total station’s

1_ft back

3_ft right

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