Place : Bua Yai Railway Station (สถานีรถไฟชุมทางบัวใหญ่)
Survey Date: March, 2021
After UAV landed to the ground, the process of photogrammetry has been applied to covered area. With sufficient GCP on ground, a quality of images can be accepted. The following orthophoto is an output which overlays on CAD drawing for asset management. (GSD 2.5cm)
3D Laser Scan
Place : Bangkok Railway Station (สถานีรถไฟกรุงเทพ)
Survey Date: February, 2021
Riegl-VZ400i is selected to be a survey machine on one day trip of scanning. GNSS RTK also pins point for each scanpose. With 2 staffs, we spent 4 hours to complete our mission with 50 scanposes. The cloud accuracy is about 3mm in line of 1.2Mhz.. An output of point cloud is here with RGB, reflectance, and amplitude.
Contour & Profiling
Place : Watabak Railway Station (สถานีรถไฟวะตะแบก)
Survey Date: April, 2021
To study topography of station, 3D Laser scanner is brought to capture all NEZ data. DSM (Digital Surface Model) is directly produced by scanner. In fact, DEM is required for topographic study accompanied with contour line and its profile. Terrain Filter helps to clear all trees and vehicles including human. Its algorithm is outstanding.