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Surveyors use Global Positioning System (GPS) technology to measure the precise location and elevation of points on Earth. In a recent survey, GPS receivers were used to determine the coordinates and elevations of two park monuments. The process involved careful mission planning, data collection, and correction to ensure accuracy. The survey began with mission planning to identify optimal satellite visibility and minimize Position Dilution of Precision (PDOP). A geodetic control point...
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The Global Positioning System (GPS) has become an indispensable tool in fieldwork, offering unparalleled precision and efficiency for surveying, navigation, and infrastructure development. By harnessing signals from a constellation of satellites, GPS receivers determine the location of objects with remarkable speed and accuracy, often completing calculations within a second.Advantages of Modern GPS TechnologyContemporary GPS receivers are designed to meet the practical demands of field...
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GPS surveying methods vary in application, accuracy, and data collection techniques, catering to diverse surveying and mapping needs. Static GPS, kinematic GPS, and real-time kinematic (RTK) surveying are widely used. Each technique offers distinct advantages.Static GPS involves placing one receiver at a known reference point and another at the target point. It collects exact positional data by observing multiple satellite ranges over an extended period, achieving centimeter-level accuracy for...
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Related Experiment Video

Updated: Oct 12, 2025

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Processing Strategy and Comparative Performance of Different Mobile LiDAR System Grades for Bridge Monitoring: A Case

Yi-Chun Lin1, Jidong Liu1, Yi-Ting Cheng1

  • 1Lyles School of Civil Engineering, Purdue University, West Lafayette, IN 47907, USA.

Sensors (Basel, Switzerland)
|November 27, 2021
PubMed
Summary

Mobile LiDAR systems offer efficient bridge monitoring, achieving centimeter-level accuracy for thickness estimation. This technology significantly reduces data acquisition time compared to static laser scanning.

Keywords:
as-built databridge deck thicknessbridge evaluationinfrastructure inspectionmobile LiDARplanar/linear/cylindrical featuresregistration

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Area of Science:

  • Geomatics Engineering
  • Civil Engineering
  • Remote Sensing

Background:

  • Precise as-built data is crucial for construction progress tracking and infrastructure monitoring.
  • Mobile LiDAR (Light Detection and Ranging) offers high-resolution data collection over large areas efficiently.
  • Accurate georeferencing and calibration are critical for mobile LiDAR data quality, impacting millimeter-level precision.

Purpose of the Study:

  • To evaluate the performance of mapping-grade and surveying-grade mobile LiDAR systems for bridge monitoring.
  • To compare mobile LiDAR data accuracy against static laser scanners.
  • To develop a strategy to mitigate georeferencing and calibration errors in mobile LiDAR data.

Main Methods:

  • Field surveys were conducted on a concrete bridge using mapping-grade and surveying-grade mobile LiDAR systems and static laser scanners.
  • A semi-automated, feature-based fine registration strategy was implemented to correct for georeferencing and calibration inaccuracies.
  • Bridge deck thickness was assessed using point cloud surface segments to minimize noise impact.

Main Results:

  • Mobile LiDAR systems achieved thickness estimates within a 1 cm range, comparable to static laser scanning.
  • Data acquisition using mobile LiDAR took approximately five minutes with minimal traffic disruption.
  • Static laser scanning required over three hours for data acquisition.

Conclusions:

  • Mobile LiDAR systems are a viable and efficient technology for accurate bridge monitoring and as-built data collection.
  • The proposed registration strategy effectively compensates for system errors, enhancing mobile LiDAR data reliability.
  • Mobile LiDAR provides a significant time-saving advantage over traditional static laser scanning for infrastructure assessment.