Eliot Sinclair & Partners re-entered the photogrammetric surveying market nearly two years ago with the purchase of a DJI Phantom 3 UAV. While this was a good introductory platform for UAV surveys we soon found the on-board camera unsuitable for the level of accuracy we required. The subsequent purchase of a DJI Matrice 600 UAV with a DJI X5 camera enabled a greater survey accuracy. We recently purchased a DJI Phantom 4 Pro for its collision avoidance capability and improved on-board camera, enhancing our ability to fly in difficult terrain. The option of adding a Post Processed Kinematic (PPK) receiver to the Matrice 600 is currently being considered, as are UAV LiDAR units which are continually improving their accuracy and miniaturisation.
ESP uses a powerful high-specification computer (Xeon E5 processor, NVIDIA Quadro P5000 Graphics card and 256GB RAM), in order to reduce data processing times, and Pix 4D digital photogrammetric processing software. Other software processing packages are currently being trialled.
ESP uses 3D Reshaper software to process UAV and scanning 3D point cloud data to create accurate 3D meshes, which are a fraction of the original file size and readable in CAD and engineering software.
UAV photogrammetric survey outputs we have delivered to date include:
- Orthomosaic images
- 3D Point Clouds
- Digital surface models (DTM’s/TIN’s)
- Textured meshes
ESP has recently submitted an application to the New Zealand Civil Aviation Authority to operate UAV’s in restricted, private and public spaces in accordance with approved operational procedures.
Work undertaken to date includes:
- Stockpile measurement for earthwork volume calculation over a 27-hectare civil construction site
- Orthomosaic image and 3D textured mesh model of the University of Canterbury 10-hectare campus including the grounds, buildings and above ground structures.
- Photogrammetric surveys of numerous slips and inter-tidal areas along the road and rail corridors north and south of Kaikoura following the Culverden/Kaikoura earthquake of November 2016.