Specifications

24
Time Spent in The Field
Post-Processing
In general, the amount of time required to occupy a point de-
pends on several factors:
1. Distance between survey points. In general, the greater
this distance, the longer the observation time.
2. Environmental conditions, or the amount of obstruction or
canopy preventing a completely open sky view. Some
obstructions may block the reception of the satellite sig
-
nal, requiring longer observation times to collect addi-
tional data for accurate processing.
Too much obstruction prevents ProMark3 (or any GPS
receiver) from receiving enough data to establish quality
survey positions.
3. Satellite Geometry (PDOP): This refers to the position of
the satellites that are orbiting the earth. If the satellites
are positioned poorly (i.e. all on one side of the sky), it is
more difficult to get an accurate position. The Mission
Planning Tool in GNSS Solutions assists in planning sur
-
vey times with optimal geometry.
Static
You will find that Static observation times will vary between 4
and 40 minutes depending upon factors 1, 2, and 3 above.
The Observation Range feature of ProMark3 is designed to as-
sist in determining observation times.
The Observation Range takes into consideration the number of
satellites and satellite geometry, and determines when enough
data has been collected for a given distance between points.
For more information on the observation range, please refer to
pages 87 and 93.
Stop-and-Go
Since the Stop-and-Go method requires an initialization, the
occupation times are much shorter than the static method.
Initialization on a known point can be accomplished in as lit-
tle as 15 seconds with a 1 second recording interval.
Initialization with the initializer bar is typically 5 minutes.
Stop-and-Go point occupations can be accomplished in as lit-
tle as 15 seconds with a 1 second recording interval.
These occupation times may vary depending upon the three
factors 1, 2 and 3 described above.