Main Roads WA and their contractor Cardno, were assessing specific topographical conditions for a new 100km road in the Hammersley Ranges, WA, over a thousand kilometres from Perth.
The client wanted to gain an understanding of the terrain, and approximately how much material would need to be moved for the new road corridor, and approached RemSense to conduct a low level fly over of the route and provide a video.
The operational area was in difficult to access and hazardous terrain, as well as high ambient temperatures.
RemSense proposed that as well as a video flyover, the clients requirements would be better serviced with the addition of a drone based survey of the route.
A Lynx VTOL (Vertical Take Off and Landing), fixed wind drone was used for the survey operation, flying over 2,000 linear kilometres to capture 79,000 overlapping, high-definition images, to enable the creation of range of model and survey types. To ensure data accuracy, a Trimble R2 GNSS receiver was also deployed.
Additionally, a multirotor drone with 4K video camera was deployed to capture and video fly-through of the route.
Over the entire route, approximately 73km2 was surveyed, capturing a corridor that was between 3 and 4 hundred meters wide. This enabled the production of highly accurate 3D orthomosaics of the site, as well as DEM’s (Digital Elevation Models) and a colourised point cloud at a GSD of between 2 and 3 centimetres.
This method of surveying was significantly quicker than a traditional on-foot survey, and also produced several orders of magnitude more of data points, providing a data set that was of far greater accuracy when used for volumetric assessment.
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