User guide

Glossary
158 Trimble M3 Total Station User Guide
stakeout
An application function to place the pin to the designed coordinate in the field.
Also referred to as the set-out function.
station
Instrument position.
target height
Height of the target.
target set
Combination of target height and measure mode.
targeting
The distinctive marking of a ground point with material of any kind, placed in a
symmetrical contrasting pattern about the point to facilitate the identification
and precise recovery of that point on an aerial photograph.
temperature correction
An amount added algebraically to a measurement to account for length changes
due to thermal variance from standard conditions.
topo
See topographic.
topographic
The features of the surface of the earth considered collectively as to form. A single
feature, such as a mountain or valley, is termed a “topographic feature.”
tribrach
The three-arm base of a surveying instrument which carries the foot-screws used
in leveling the instrument.
VA
Vertical angle.
X, Y, or Z
An expression for coordinates, with separate meanings for EC Cartesian and
rectangular coordinates. In the EC Cartesian system, X refers to the (direction of
the) coordinate axis running from the system origin to the Greenwich Meridian, Y
to the axis running from the origin through the 90-degree east longitude meridian,
and Z to the polar ice cap. In rectangular coordinate systems, X refers to the east-
west axis, Y to the north-south axis, and Z to the height axis.
XON/XOFF
Data transmission protocol.
zenith
The point of the sky directly above the observer’s head.
zenith angle
An angle measured from a vertical reference. Zero degrees is a vertical line
pointing up, 90 degrees is horizontal, and 180 degrees is straight down.