Mainly gps, RTK, total station, level. GPS is mainly used as a control network. Some roads have long routes, so it is more convenient and simple to control with GPS. For road survey, please refer to Code for Highway Survey and Code for Railway Survey. This involves the time of GPS measurement and the accuracy of data processing. RTK is mainly to set a preliminary point to measure the strip map, section and volume of highway. Rtk survey is better in plain areas, but not ideal in mountainous areas. Total station is more accurate than RTK in lofting and quality acceptance, especially in elevation, which is much higher than RTK. The level is mainly used as the elevation control network, which is super flat with the road. When digging, the elevation is set, and the accuracy of third-and fourth-class leveling is basically enough! Basic contents: including the survey stage, measuring the span length of the bridge, surveying and mapping the bridge site profile, bridge span position map, bridge site topographic map, underwater topographic map and water surface profile map, providing necessary detailed surveying and mapping data for bridge site selection and bridge design; Control network layout and measurement stage. Measure the length of bridge axis, lay out, measure and adjust the bridge control network, insert points that meet the needs of pier crossing in the bridge control network, provide the control network with the required accuracy for further construction lofting, completion measurement and deformation monitoring, establish a baseline field at the construction site, and check the length measuring instruments or tools in time. Pier positioning and axis measurement, pier positioning of straight bridge or curved bridge, longitudinal and transverse axis measurement of pier, caisson positioning measurement; Bridge detail lofting, open-cut foundation and pile foundation construction lofting, pipe column positioning and inclination measurement, open caisson construction survey and bridge survey.