GPS in Land Surveying. Evergreen Valley College Engineering and Engineering Technology H. Johnston, T. Redd, A. Tabrizi July 12, 2005. Today’s Topics . Part I Background Information Accuracy and Precision What is GPS? Why and who uses it? How does it work? GPS Surveying – The Basics
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GPS in Land Surveying
Evergreen Valley College
Engineering and Engineering Technology
H. Johnston, T. Redd, A. Tabrizi
July 12, 2005
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Wireless Communication Technology
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Two-way ranging by EDM
D
one clock used to measure
t
d
D
Two way travel time:
t=2d/c.
D
Distance: d=c
t/2
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or TRANSIT (5 to 7 satellites at 1100 km
polar orbits. Provided navigational help to
the US Navy's Polaris submarine fleet.
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Good Precision Poor Precision Good Precision
Good Accuracy Good Accuracy Poor Accuracy
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So nothing is new here! Hi-tech or not, we still need to use caution.
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Definitions
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information anywhere on earth –
Global Positioning System
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Could be used to track mail
if properly used!
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Mapping
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Each signal contains:
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