Applications of Lidar Technology in Urban Geophysical Surveys

Abstract

This research examines the utilization of mobile LiDAR technology for comprehensive urban geophysical surveys, with a specific emphasis on monitoring infrastructure and urban planning. The study challenge focuses on the requirement for precise and detailed geographical data to assist in making informed urban development and management decisions. The approach utilized a transportable LiDAR device with a laser pulse frequency of 200,000 pulses per second at 1,200 meters. Data collection employed precise GPS and IMU for positional and orientation accuracy, respectively. Statistical analysis included noise filtering and classification metrics to evaluate data quality. Results from the study demonstrated the significant capabilities of LiDAR technology: the survey captured over 10.000 points per square meter with a point accuracy of 0.150 meters. Noise filtering processes retained an average of 85% of data points, with ground classification achieving accuracies above 95%. Statistical tools included standard deviation calculations for elevation models, revealing mean elevations ranging from 13.750 to 19.400 meters across surveyed areas. In addition, LiDAR technology could identify structural deformations of up to 0.200 meters in metropolitan buildings. The study highlights the efficacy of LiDAR in offering accurate and extensive geospatial data for urban planning and infrastructure management. This research adds to the current understanding by showing how LiDAR may be used to improve decision-making and increase the ability of cities to withstand and recover from challenges.