Spectra Precision Survey Pro v4.5 Ranger User Manual - Manual (Page 131)

Other Conventional Surveying Tutorials
121
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