The application of GPS in road engineering is currently mainly used to
establish various road engineering control networks and measure external control
points for aerial surveys. With the rapid development of high-grade highways,
higher requirements have been put forward for surveying technology. Due to the
long route and few known points, conventional surveying methods are not only
difficult to lay out the network, but also difficult to meet the high-precision
requirements. At present, China has gradually adopted GPS technology to
establish a high-precision control network for the first level of the line, and
then used conventional methods to lay out wire encryption. Practice has proven
that the point error within a range of tens of kilometers is only about 2
centimeters, achieving an accuracy that conventional methods cannot achieve,
while also greatly advancing the construction period. GPS technology is also
applied in the control measurement of super large bridges. Due to the absence of
intervisibility, it can form a strong network shape, improve point accuracy, and
is also very effective for detecting support points in conventional
measurements. GPS technology also has broad application prospects in tunnel
measurement. GPS measurement does not require inter visibility and reduces the
intermediate steps of conventional methods. Therefore, it has fast speed, high
accuracy, and obvious economic and social benefits.
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