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International Journal of Wildland Fire International Journal of Wildland Fire Society
Journal of the International Association of Wildland Fire
RESEARCH ARTICLE (Open Access)

Rate of spread and flaming zone velocities of surface fires from visible and thermal image processing

B. Schumacher https://orcid.org/0000-0002-5572-9507 A * , K. O. Melnik https://orcid.org/0000-0002-0258-4965 B , M. Katurji A , J. Zhang A D , V. Clifford D and H. G. Pearce C
+ Author Affiliations
- Author Affiliations

A School of Earth and Environment, University of Canterbury, Christchurch, New Zealand.

B School of Engineering, University of Canterbury, Christchurch, New Zealand.

C Fire and Emergency New Zealand, Wellington, New Zealand.

D New Zealand Forest Research Institute (Scion), Christchurch, New Zealand.

International Journal of Wildland Fire 31(8) 759-773 https://doi.org/10.1071/WF21122
Submitted: 27 August 2021  Accepted: 8 June 2022   Published: 22 July 2022

© 2022 The Author(s) (or their employer(s)). Published by CSIRO Publishing on behalf of IAWF. This is an open access article distributed under the Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International License (CC BY-NC-ND)

Abstract

This study presents two new remote sensing approaches that can be used to derive rate of spread and flaming zone velocities of a wildfire at very high spatiotemporal resolution. Time sequential image tracking from thermal or visible video collected on uncrewed aerial vehicles is used to estimate instantaneous spatial rate of spread of a surface fire. The techniques were developed using experimental wheat‐stubble burns carried out near Darfield, New Zealand, in March 2019. The thermal tracking technique is based on Thermal Image Velocimetry, which tracks evolving temperature patterns within an infrared video. The visible tracking technique uses colour thresholding, and tracks fire perimeter progression through time at pixel resolution. Results show that the visible perimeter tracking creates a higher mean rate of spread compared to thermal image velocimetry. The visible perimeter tracking provides rate of spread measurements for fire front progression whereas the thermal tracking techniqueis computationally more expensive, but can resolve velocities of thermal structures within the flaming zone and provides spatiotemporal rate of spread measurements. Both techniques are available as open‐source code and providevital scientific data for new studies concerning e.g. fire–atmospheric interactions or model validation. They may be adapted for operational purposes providing rate of spread at high spatiotemporal resolution.

Keywords: Adaptive thermal image velocimetry, fire rate of spread, image velocimetry, perimeter tracking, ROS, thermal imagery, uncrewed aerial vehicles, wildfire.


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