18.1. Appendix A – Glossary
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RTK
Network
Association of base stations that transmit their position
data to a server via the internet (NTRIP). The vehicles
in the RTK network (rovers) also transmit their
position to the server via mobile radio. The server uses
the position data from the base stations and vehicles to
calculate the correction data for each vehicle and
transmits it to the vehicle via mobile radio. This allows
position determination to be carried out with an
accuracy of 1-2 cm in real time.
SBAS (Satellite-Based Augmentation System) This is a
system which supports wide area or regional
augmentation through the use of additional satellite
broadcast messages. SBAS correction sources are
commonly composed of multiple ground stations
which take the measurements of one or more GNSS
satellites, and the satellite signals and environmental
factors that may impact the signal.
Shapefile A shapefile stores non-topological geometry and
attribute information for the spatial features in a data
set. The geometry for a feature is stored as a shape
comprising a set of vector coordinates. It is in the form:
abcd.shp
WAAS (Wide Area Augmentation System) This US SBAS was
developed by the US Federal Aviation Administration
to serve as an air navigation aid by improving the
accuracy and availability of the GPS signals.
WAS Wheel angle sensor
Wayline The virtual line between two way points in a field. The
wayline is used as reference for further field runs (also
Guideline).
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