Leica Geosystems TPS1100 Professional Series - Reference Manual - Manual (Page 83)

83
TPS1100 - Appl. Prog. Ref. Manual 2.2.0en Hidden Point
Hidden Point
Introduction
This manual describes the "Hidden
Point" program of the TPS1100
Professional series.
The program allows measurements
to a point that is not directly visible,
using a special hidden-point rod. The
data for the hidden point are
calculated from measurements to the
prisms mounted on the rod with a
known spacing and a known length of
rod. The rod may be held at any
angle, as long as it is stationary for all
measurements.
"Measurements" are calculated as if
the hidden point was observed
directly. These "calculated
measurements" can also be
recorded.
The hidden-point rod can have either
two or three reflectors. The rod you
are using is defined in the
"Configuration" of the program.
R1-R2
R1-R3
rod length
E, N, H of
Hidden Point
1
100pr26
Here, you enter the length of the rod,
spacing between reflectors, and the
prism constant.
Refer to the following
picture, which illustrates a hidden-
point rod with three reflectors.
If the hidden-point rod you are using
has three reflectors, the program
calculates coordinates for the hidden
point from three measurement
combinations:
Reflector 1 + Reflector 2
Reflector 3 + Reflector 2
Reflector 1 + Reflector 3
The X, Y and Z coordinate values
resulting from each of these
measurement combinations are
meaned to produce the XYZ
coordinates of the hidden point.
In the case of motorized theodolites,
you can configure the program so
that it points the telescope at the
third reflector automatically, after the
first two reflectors have been
measured.