We have found that GPS surveying technology is
versatile and adaptable and could be utilised in most civil
engineering and construction projects. It is user friendly and
can link up with various software applications to give the professional
surveyor an accurate and all-round surveying tool.
GPS (Global Positioning System) Surveying is the most
advanced positioning and data recording technology available
to the Land Surveyor today. Using available Satellites
(Minimum 4), two special Receivers recording satellite
signals and internal receiver software, sub-centimetre
accurate horizontal and vertical positioning data is provided
about any point or feature. This data can be related either
to the OS National Grid Co-ordinate system or to your
project’s own Local Grid. The recorded data can
be processed and manipulated by various software applications,
depending on client requirements. The processed data is
then available to the Project Team in various forms to
ensure everyone has the highest quality information to
hand.
The GPS system was set up and is controlled
by the U.S. Army. They have 24 satellites in orbit around the
earth. These satellites transmit signals to GPS receivers on
the ground. The receivers use the signals from a number of satellites
to calculate their own position on the earth's grid reference
system with accuracy ranging from 100m to 1-2 cm depending on
the equipment used.
The equipment we use is the Trimble 4000Ssi and 4800, dual
frequency, RTK (Real Time Kinematic) system. This is a versatile
system, which is capable of bringing control points accurately
to the site. We record the survey data using both Faststatic
and Kinematic.
