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Infrared sensing gives drones a new edge

1 June 2018

An ‘x-ray vision system’ that overlays three specific technologies to assess the structure and health of individual trees in plantation forests through the canopy is being developed in South Australia. University of South Australia autonomous systems expert Professor Anthony Finn said an infrared sensor gave the drone the “x-ray vision” to see through forest canopies.

The collaboration between the forest industry, University of South Australia and the South Australian Government was launched recently to undertake research to boost productivity in the large plantation forests in the south east of the state. Among the first projects undertaken by the Forestry Research Mount Gambier is to develop sophisticated imaging sensors that can be fitted to drones.

The three-pronged measurement approach uses Light Detection and Ranging (LiDAR), thermal infrared imaging and the hyperspectral imaging to generate 3D data. The remote sensing will allow both ground data and airborne data to accurately predict wood volumes, consider the impact of fires, insect damage and wind damage on yields.

University of South Australia autonomous systems expert Professor Anthony Finn said the addition of the infrared sensor gave the drone the “x-ray vision” to see through the canopies to provide a full image of the trunk.

“We – like everyone else – use LIDAR to get point clouds but one of the challenges of LIDAR is the canopies to the trunks of the trees,” he said. “What we do with the infrared cameras is we carefully manage the spectral properties of what we’re looking at so we can see through to the trunks – in simple terms you could consider it almost like x-ray vision. In addition to this we look at the surface chemistry using the hyperspectral imaging sensor, which provides us with an insight into how the trees are thriving as well.”

LiDAR and drones have been used by the forestry industry for a decade but the additional use of high-resolution cameras and infrared sensors allows the researchers to “fill in the gaps”. The system aims to achieve significant cost savings through a reduction in manual groundwork and more precise measurement and troubleshooting capabilities.

Field trials of the technology were conducted last month in South Australia and New South Wales, with mapping set to soon begin near Mt Gambier. The drones are currently only able to scan small sections of forest at a time but Professor Finn said miniaturisation of the imaging software and possible commercialisation in the future would shrink the payload and allow it to be fitted to much smaller, more efficient drones.

“The trick at the moment is you’ve got to get a high-resolution sensor and in order to get one of those you almost have to build your own,” he said. “Initial prototypes tend to be bigger than people are used to so you have to use a bigger drone.”

Some of the early results from these in-forest drone trials in S.A. using imaging sensors (LiDAR, electro-optic, thermal infrared and hyperspectral) will be presented this year at this year’s ForestTECH 2018 series scheduled to run in Melbourne on 20-21 November. The New Zealand leg of the annual remote sensing tech event will be run a week earlier, in Rotorua on 14-15 November. Early details can be found on the event website, www.foresttech.events.

Source & Image: The Lead

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