Drone-LiDAR derived topographic survey and photogrammetry modelling for slope stabilisation designs
Diodrone was commissioned to provide a detailed topographic survey across 8no. roadside geotechnical risk sites to inform the design and scoping of slope stabilisation and remediation solutions. 3no. of the sites included recent landslide scarps where a more detailed visualisation was needed to assist with placement of rock bolts and scoping of scaling and profiling works.
Each of the sites included a significant degree of vegetation cover with some of the locations including old growth eucalypt tree canopies exceeding 50m in height.
Diodrone developed a drone based solution that utilised a combination of LiDAR and photogrammetry to produce topographic survey outputs and a 3D visualisation of the landslide scarps.
Drone-LiDAR provided reliable topographic data, even in areas of dense vegetation cover and tree canopy. Drone-photogrammetry provided rich visualization of the exposed scarps and road corridor, informing designers with site context and a survey grade 3D model of the scarp geology and structures.
The drone-LiDAR survey was tested in line with ICSM Guidelines — achieving better than 100mm vertical accuracy at 95% confidence.
The topographic survey deliverables included an orthophoto, digital terrain model and elevation contours. Leveraging the LiDAR and photogrammetry outputs, feature extraction was completed to provide line work for road infrastructure and landform features.
The project was delivered in a fast turnaround time, with rapid mobilisation to site and quick turnaround of deliverables to meet the client’s project programme and ensure timely commencement of stabilisation and remediation activities.