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8 RTK Mapping
8.1 Introduction
This chapter introduces the basic principles of using Real-Time
Kinematic (RTK) techniques to collect data for use in GIS and CAD
systems. It identifies procedures and techniques to ensure that the
equipment is used appropriately to achieve the specified levels of
accuracy from the RTK system.
8.2 Introduction to RTK
If you need to collect features with a very high level of precision, you
can configure the Asset Surveyor software to collect RTK data.
GPS data collection for geographic information systems (GIS) has
generally been carried out using GPS receivers that achieve submeter
levels of accuracy by applying differential correction techniques for
postprocessed and real-time data collection. However, RTK
techniques allow you to collect positions with centimeter levels of
accuracy.
With an RTK system, this level of accuracy can now be obtained for
mapping purposes, along with the same powerful feature and attribute
data collection.
To obtain these higher levels of accuracy, you need to apply more
rigorous data collection techniques than those used for differential
data collection. While the basic GPS correction concepts are the same
for both RTK and differential data collection, the tolerances associated
with RTK data collection are more precise. Errors which could be
overlooked for differential operations now become important and
must be accounted for carefully in order to obtain the centimeter levels
of accuracy achievable with the RTK system.
186 TSC1 Asset Surveyor Operation Manual