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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