Leica GPS1200+, Technical Reference Manual, Page: 1248 / 1442

Survey - Hidden Points 1248
47 Survey - Hidden Points
47.1 Overview
Description Hidden points cannot be measured directly by GPS. This is because they can not be physi-
cally reached or because satellites are obstructed, for example by trees or tall buildings.
• A hidden point can be calculated by measuring distances and/or azimuths to the hidden
point using a hidden point measurement device. Or for distances a tape may be used.
Refer to "22.7 Hidden Point" for information on supported hidden point measurement
devices.
• Additional auxiliary points may be manually occupied.
• Bearings may be computed from previously occupied points.
In contrast to the COGO application program, hidden point measurements is more of a
measuring application program than a calculation application program.
Example
Application: Completing a survey of telegraph poles for a telecom-
munication company.
Aim: The telegraph poles must be surveyed to 0.3 m accu-
racy in plan but height is not of concern.