57
Hidden Point on TS
57.1
Overview
Hidden points cannot be measured directly by a TS instrument, because they
are not directly visible.
A hidden point can be calculated from measurements to prisms mounted on a
hidden point rod. The spacing and length of the hidden point rod are known.
The hidden point rod can be held at any angle, as long as it is stationary for all
measurements.
Measurements for the hidden point 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 prisms. If three prisms are
used the average will be calculated.
The prisms on the hidden point rod are also called auxiliary points after they
have been measured.
TS_046
d1
d2
d3
1
3
2
1 Prism 1
2
Prism 2
3
Prism 3
d1 Rod length
d2 Distance from prism 1 to prism
2
d3 Distance from prism 1 to prism
3
The Hidden Point app can be used for the following tasks:
•
The hidden point app can be used to obtain accurate three-dimensional
coordinates for a point that is blocked from direct measurement by an
obstruction.
•
Determination of flow line locations and elevations in inspection hatches,
without measuring from the rim to the flow line. Estimation corrections for
nonverticality of the measuring tape and eccentricity from the rim meas-
urement to the flow line.
•
Determination of recesses in building corners for detailed surveys, without
estimating right angle offsets, with or without taping of the dimensions.
•
Measurements behind overhangs, buttresses and columns for quantity
determinations in underground construction or mining, without estimating
right angle offsets, with or without taping of the dimensions.
•
Measurements of industrial process piping or other equipment in close
quarters.
•
Detailed architectural surveys for remodelling or cultural preservation or
restoration work
•
Any place where accurate measurements would require many more instru-
ment setups in order to achieve line of sight from the instrument to the
points being measured.
The TS Hidden Point app does not generate a report sheet.
57.2
Accessing Hidden Point and Measuring
Select
Leica Captivate - Home
:
TS hidden point
menu.
Description
Hidden point rod
Hidden point tasks
☞
Access
944
Hidden Point on TS
