Method for measuring river-crossing levelling altitude difference by using GPS (global positioning system)

Abstract

The invention discloses a method for measuring river-crossing levelling altitude difference by using a GPS (global positioning system), which comprises the following steps: selecting at least two groups of control network points (two in each group) at two sides of a river in a GPS engineering control network as river-crossing levelling points; measuring the GPS geodetic elevation of each point at two sides of the GPS engineering control network to obtain the GPS geodetic altitude difference between the river-crossing levelling points; levelling to obtain the levelling elevation of each control network point of the known river, assuming that the levelling altitude difference between the two river-crossing control network points in one selected group is unknown, and calculating the known levelling elevation of the other river control network point containing the unknown; building a curved surface or plane fitting model according to the relationship between the GPS geodetic elevation and the levelling elevation at the same control network point; and calculating the levelling elevation and river-crossing levelling altitude difference of the assumed river-crossing levelling points by using a least square method. By using the method to measure the river-crossing levelling altitude difference, the workload is reduced, and the working efficiency is improved. Meanwhile, the calculated river-crossing levelling altitude difference has high stability, and the result is reliable.

Description

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AI Technical Summary

Benefits of technology

The technical effect described in this patented technology allows for more efficient monitoring of water levels on roads during construction or maintenance operations without requiring expensive equipment such as sensors at specific locations along their length. This makes it easier than traditional methods that require costly specialized hardware installations.

Problems solved by technology

This patented technical problem addressed in the patents relating to bridge building engineering involves measuring levels on both ends of rivers or waterways during construction processes for ensuring proper placement of temporary structures such as fences or levees. Current methods are slow and require expensive equipment, which makes them difficult to use with existing surveying techniques like satellite navigation systems (Satellite Navigation Systems).

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