Spectra Precision Survey Pro CE v3.6 User Manual - Manual (Page 112)

User’s Manual
106
point of view).
4. Enter a positive offset distance in the Horz Dist Offset field if the
offset to the new point is behind the rod location (from the total
station’s point of view), or enter a negative offset distance if the
new point is in front of the rod location.
5. If the new point is at a different elevation than the rod location,
enter the a positive vertical offset in the Elevation Offset field, or a
negative vertical offset if the new point is below the rod location.
6. After all the appropriate fields are filled in correctly, aim the total
station at the prism and tap the
6KRRW button. The offset
distance(s) entered will be applied when computing the
coordinates for the new point and the new point will be stored as
a side shot.
Horizontal Angle Offset Screen
The Horizontal Angle Offset screen is used to store a new point that
lies on a line tangent to the rod and perpendicular to the line formed
between the total station and the rod. (See illustration.) The routine
requires two shots by the total station; one at the prism, located to
the side of the new point; and one in the direction of the new point.
This example explains how to store a point at the center of an
obstacle – such as a big tree.
1. From the Main Menu, tap
 6XUYH\ , +RU] $QJOH 2IIVHW or use the
Ctrl
-[P] hotkey. If you have not already setup your backsight, you
will need to do so before the Horizontal Angle Offset Shot screen
will open.
2. The rod person should position the prism to
the side of the location of the new point so
that the angle formed by the new point, the
prism, and total station form 90°. (See
illustration.)
3. With the total station aimed toward the new
point, tap the
$LP &HQWHU button. Only the
horizontal angle is measure during this shot
so a prism does not need to be used.