Spectra Precision ProMark 800 Reference Manual - Manual (Page 67)

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Precise Surveying - Field Applications & Concepts
Precision receivers will help you take a decision on when
to stop data collection.
• The lower the DOP, the larger the number of received
satellites and the more open the sky, the better the
chances for successful initialization. Such indicators as
DOP, number of satellites received, sky quality (presence/
absence of obstructions) will indirectly help you get a good
idea of whether initialization will be achieved or not.
Interpreting these environmental parameters will be easier
as you become an experimented operator.
• In kinematic surveys, it is a good practice to deal with
initialization at the beginning of a survey and then make
sure you won’t lose it until the end of the survey.
However, you should be aware that, whether you are
performing a kinematic or static survey and regardless of
the method used to help secure initialization, the only
thing that counts for a successful initialization is the
amount, quality and continuity of the collected data. This
means that all the logged data, and not only those logged
at the beginning of the survey, can contribute to
successful initialization.
• Choose the initialization method that is most appropriate
to your survey. The Initializer Bar method (for ProMark3
users) and the “Known Point” method are preferred
whenever possible.
Required Observation Times
The charts below show the minimum observation times
required with Spectra Precision receivers, as a function of
baseline length, initialization method and receiver type for
normal operating conditions (open sky, 8 satellites received,
PDOP<3 and 1-second raw data recording rate).