
14
Promark2 User’s Guide
Surveying with ProMark2
The ProMark2 system is designed to perform GPS surveys using static, stop-and-go, and
kinematic modes of GPS data collection. The three modes run independently and the GPS
receiver must be turned off to run in a different mode.
In the static data collection mode, the GPS receiver systems simultaneously collect raw data
from all available satellites while remaining stationary on their respective points. Data
collection continues at these locations for a duration dependent upon the distance between the
receivers, the satellite geometry, and the obstruction conditions at the data collection locations
(i.e., trees or buildings blocking some of the sky). When data collection is complete at these
specific points, you move the GPS receiver systems to a new set of points to begin another data
collection session. In most cases, one GPS receiver system will remain on its current point
(pivot point) in order to link the previous set of points to the new set of points, in leap-frog
fashion. After data collection is complete, data is downloaded form the GPS receivers to an
office computer for post-processing using the Ashtech Solutions software. The post-
processing activity computes vectors (position differences) to determine the position of all
observed points relative to one or more fixed point positions. The static data collection method
produces the most accurate and reliable results of any mode of GPS data collection. This is
due primarily to the extended observation periods required for static data collection.
In the stop-and-go data collection mode, the GPS receiver systems simultaneously collect raw
data from all available satellites while stationary on their respective points and while moving
between points. In most cases, one GPS receiver system is located on a known point serving as
a base station collecting data at that location for the duration of the survey. Additional GPS
receiver systems are used to locate objects and move between points. The occupation period
for the stop-and-go method is much shorter than the static method. After data collection is
complete, data is downloaded form the GPS receivers to an office computer for post-
processing using the Ashtech Solutions software. The post-processing activity computes
vectors (position differences) to determine the position of all observed points relative to one or
more fixed point positions. The stop-and-go data collection method is faster than the static
method, but not as accurate since the occupation period is much shorter.
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