
44
Promark2 User’s Guide
7. Measure and record instrument height (HI) of GPS antenna
The GPS antenna is the data collection point for GPS observations, i.e. the computed
position for the point, horizontally and vertically, will be the location of the GPS
antenna. It is for this reason that the antenna is precisely positioned over the point to
be surveyed. Yet the location of the point to be surveyed is not at the center of the
antenna, but below it on the ground. The HI allows the computed position of the
antenna center to be transferred to the ground point. It is critical that the HI of the
antenna above the monument is measured accurately. The HI tape is the tool you use
to measure the HI of the GPS antenna. Hook the tape into the groove on the side of
the GPS antenna. Extend the tape down to the survey monument, placing the point on
the end of the tape on the monument. Lock the tape in place and read the
measurement. Figure 3.14 illustrates this process. It is good practice to read and
record the HI measurement in both meters and feet. This will help reduce HI
recording errors.
Figure 3.13
Antenna Cable Connection at the Antenna and Receiver
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