Spectra Precision ProMark 800 Reference Manual - Manual (Page 71)

59
Precise Surveying - Field Applications & Concepts
• Position the base system exactly over the landmark.
• Insert the end of the Spectra Precision measurement tape
into the slot representing the SHMP.
• Unroll the tap toward the landmark and position the tip of
the measurement tape onto the landmark.
• Block the tape and read the value indicated by the
measurement tape: this is the slant height.
• Enter this value into the base system as a slant
measurement.
If a Spectra Precision antenna is used, the system will
automatically determine the true antenna height because
it has got all the antenna parameters in its memory to
perform the conversion.
For another antenna however, you will first have to create
a new antenna type in the system and enter its parameters
(see GNSS Antenna Features on page 56) in order to be
sure the system can accurately convert the slant
measurement into real height.
Vertical Height
Measurement
This is a more straightforward method for measuring the
antenna height. It is generally used on the rover side.
The vertical height represents the distance from the bottom
of the GNSS antenna to the ground.
Landmark
Base
Read slant height
value here