Abstract
Abstract. Nowadays, Terrestrial Laser Scanning (TLS) technology is gaining popularity in monitoring and predicting the movement of landslide due to the capability of high-speed data capture without requiring a direct contact with the monitored surface. It offers very high density of point cloud data in high resolution and also can be an effective tool in detecting the surface movement of the landslide area. The aim of this research is to determine the optimal level of scanning resolution for landslide monitoring using TLS. The Topcon Geodetic Laser Scanner (GLS) 2000 was used in this research to obtain the three dimensional (3D) point cloud data of the landslide area. Four types of resolution were used during scanning operation which were consist of very high, high, medium and low resolutions. After done with the data collection, the point clouds datasets were undergone the process of registration and filtering using ScanMaster software. After that, the registered point clouds datasets were analyzed using CloudCompare software. Based on the results obtained, the accuracy of TLS point cloud data between picking point manually and computed automatically by ScanMaster software shows the maximum Root Mean Square (RMS) value of coordinate differences were 0.013 m in very high resolution, 0.017 m in high resolution, 0.031 m in medium resolution and 0.052 m in low resolution respectively. Meanwhile, the accuracy of TLS point cloud data between picking point manually and total station data using intersection method shows the maximum RMS values of coordinate differences were 0.013 m in very high resolution, 0.018 m in high resolution, 0.033 m in medium resolution and 0.054 m in low resolution respectively. Hence, it can be concluded that the high or very high resolution is needed for landslide monitoring using Topcon GLS-2000 which can provide more accurate data in slope result, while the low and medium resolutions is not suitable for landslide monitoring due to the accuracy of TLS point cloud data that will decreased when the resolution value is increased.
Highlights
Landslide is considered as one of the worst natural phenomenon that threat human life and property all over the world, including Malaysia
All the registration and georeferencing errors for both epoch was computed automatically by ScanMaster software have given the same values for each different dataset which are corresponding to four different scan resolutions
This is because the method that used for scanning the target scan using Topcon Geodetic Laser Scanner (GLS)-2000 laser scanner is automatically computed to determine the center of the target scan without requiring any setting for resolution
Summary
Landslide is considered as one of the worst natural phenomenon that threat human life and property all over the world, including Malaysia. Some landslide moves slowly and cause damage steadily, and some landslide move so rapidly that can destroy property and take lives very suddenly and unexpectedly. In order to prevent landslide, an effective technique is required to maintain and monitor the slope area which is exposed to the risk of landslide. There are many method and approaches has been developed in different way and view to prevent and predict the landslide tragedy. One of the modern technology in surveying tools is Terrestrial Laser Scanning (TLS). The application of laser is adopted in the field of measurement and data capture in TLS has made it a different and unique technique compare to the other available methods
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