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Aerial Mapping of Forests Affected by Pathogens Using UAVs, Hyperspectral Sensors, and Artificial Intelligence

Sandino, J., Pegg, G., Gonzalez, F. and Smith, G. (2018) Aerial Mapping of Forests Affected by Pathogens Using UAVs, Hyperspectral Sensors, and Artificial Intelligence. Sensors, 18 (4). p. 944. ISSN 1424-8220

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Article Link(s): http://doi.org/10.3390/s18040944

Publisher URL: http://www.mdpi.com/1424-8220/18/4/944

Abstract

The environmental and economic impacts of exotic fungal species on natural and plantation forests have been historically catastrophic. Recorded surveillance and control actions are challenging because they are costly, time-consuming, and hazardous in remote areas. Prolonged periods of testing and observation of site-based tests have limitations in verifying the rapid proliferation of exotic pathogens and deterioration rates in hosts. Recent remote sensing approaches have offered fast, broad-scale, and affordable surveys as well as additional indicators that can complement on-ground tests. This paper proposes a framework that consolidates site-based insights and remote sensing capabilities to detect and segment deteriorations by fungal pathogens in natural and plantation forests. This approach is illustrated with an experimentation case of myrtle rust (Austropuccinia psidii) on paperbark tea trees (Melaleuca quinquenervia) in New South Wales (NSW), Australia. The method integrates unmanned aerial vehicles (UAVs), hyperspectral image sensors, and data processing algorithms using machine learning. Imagery is acquired using a Headwall Nano-Hyperspec ® camera, orthorectified in Headwall SpectralView ® , and processed in Python programming language using eXtreme Gradient Boosting (XGBoost), Geospatial Data Abstraction Library (GDAL), and Scikit-learn third-party libraries. In total, 11,385 samples were extracted and labelled into five classes: two classes for deterioration status and three classes for background objects. Insights reveal individual detection rates of 95% for healthy trees, 97% for deteriorated trees, and a global multiclass detection rate of 97%. The methodology is versatile to be applied to additional datasets taken with different image sensors, and the processing of large datasets with freeware tools.

Item Type:Article
Business groups:Horticulture and Forestry Science
Keywords:Austropuccinia psidii; drones; hyperspectral camera; machine learning; Melaleuca quinquenervia; myrtle rust; non-invasive assessment; paperbark; unmanned aerial vehicles (UAV); xgboost
Subjects:Agriculture > Agriculture (General) > Farm machinery and farm engineering
Forestry
Forestry > Forestry machinery and engineering
Technology > Technology (General)
Deposited On:14 Aug 2018 03:47
Last Modified:14 Aug 2018 03:48

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