Vegetation defect mapping along 4km of HV Feeders within surburban rail corridoR using drone LiDAR and photogrammetry modelling.
Vegetation management for high voltage feeders, and the rail corridor in general, is a major area of asset maintenance for railway operators. A section of rail corridor that contained several areas of protected Blue Gum forests. These were in close proximity to two high voltage feeders. The need to maintain safe vegetation clearances while maintaining environmental protection requirements had raised concerns about the location of a new feeder alignment. Sydney Trains approached Diospatial to develop a detailed vegetation defect mapping and clearance survey for HV feeders.
Diospatial developed a methodology involving drone LiDAR. Drone LiDAR would be used to capture a digital twin of the site. The data would then be processed to analyse the vegetation clearances to the high voltage feeders. Our specialist drone pilots carried out 6 drone flights which captured LiDAR and photogrammetry data for the 3.8km of rail corridor.
Initially, LiDAR data was classified into ground, HV feeders, overhead wiring structures, 1500V OHL and buildings. The classified data was then analysed for vegetation to conductor clearances along the length of the two feeders. The defects were then reported in GoogleEarth compatible file formats. This could then be used to support field crews while completing vegetation clearing.
Additionally, the survey report identified several areas where the existing pole location data was incorrect.
Included with the survey data was a complete topographic survey. Also included was survey of all structures and signals and ballast profiles. This was completed for the entire 3.8km suburban rail corridor.