Introduction
153
Introduction
In the early days of surveying with GPS, data collection time on a single point was
measured in hours, few was the number of points established in a day, and
completion of a large project could take weeks. The results of a day's work were not
known until much later when the data was finally processed at the main office. The
equipment required to perform this seemingly magical task was large, heavy and
came with a price tag of approximately $300,000 for a pair of receivers.
At that time it would have been difficult to imagine that some day, data collection times
would be measured in seconds, hundreds of points could be established in a single
day, and large projects could be completed in hours. Results would be known
immediately, in real-time. The new generation of equipment required to perform this
task would be small, light enough to be carried by one person all day, and the price of
the typical system would be under $40,000.
What you've just read is the difference between GPS surveying in the early 1980s and
GPS surveying today. Early GPS surveying was static in nature. A user sat on a point
for a extended period of time, 1-3 hours or more. If time permitted, this user would
move to another point after data collection was completed. Data was then sent off to
the main office for post-processing. Only after the data was processed were the
results of the survey obtained. Since then, GPS surveying has become more dynamic
in nature. Equipment has become small enough to be portable. With the incorporation
of a radio link between sets of GPS equipment, data can be processed in real-time as
it is being collected. New techniques in data processing have resulted in the ability to
establish precise positions in seconds. These advances allow for a user to move
around a project site, quickly establishing the position of objects of interest and seeing
the results immediately. This is Real-Time Kinematic or RTK Surveying.
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