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Automated georectification and mosaicking of UAV-based hyperspectral imagery from push-broom sensors

Citation

Angel, Y and Turner, D and Parkes, S and Malbeteau, Y and Lucieer, A and McCabe, MF, Automated georectification and mosaicking of UAV-based hyperspectral imagery from push-broom sensors, Remote Sensing, 12, (1) Article 34. ISSN 2072-4292 (2020) [Refereed Article]


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Copyright Statement

Copyright 2019 The Authors. Licensed under Creative Commons Attribution 4.0 International (CC BY 4.0) https://creativecommons.org/licenses/by/4.0/

DOI: doi:10.3390/RS12010034

Abstract

Hyperspectral systems integrated on unmanned aerial vehicles (UAV) provide unique opportunities to conduct high-resolution multitemporal spectral analysis for diverse applications. However, additional time-consuming rectification eorts in postprocessing are routinely required, since geometric distortions can be introduced due to UAV movements during flight, even if navigation/motion sensors are used to track the position of each scan. Part of the challenge in obtaining high-quality imagery relates to the lack of a fast processing workflow that can retrieve geometrically accurate mosaics while optimizing the ground data collection eorts. To address this problem, we explored a computationally robust automated georectification and mosaicking methodology. It operates eectively in a parallel computing environment and evaluates results against a number of high-spatial-resolution datasets (mm to cm resolution) collected using a push-broom sensor and an associated RGB frame-based camera. The methodology estimates the luminance of the hyperspectral swaths and coregisters these against a luminance RGB-based orthophoto. The procedure includes an improved coregistration strategy by integrating the Speeded-Up Robust Features (SURF) algorithm, with the Maximum Likelihood Estimator Sample Consensus (MLESAC) approach. SURF identifies common features between each swath and the RGB-orthomosaic, while MLESAC fits the best geometric transformation model to the retrieved matches. Individual scanlines are then geometrically transformed and merged into a single spatially continuous mosaic reaching high positional accuracies only with a few number of ground control points (GCPs). The capacity of the workflow to achieve high spatial accuracy was demonstrated by examining statistical metrics such as RMSE, MAE, and the relative positional accuracy at 95% confidence level. Comparison against a user-generated georectification demonstrates that the automated approach speeds up the coregistration process by 85%.

Item Details

Item Type:Refereed Article
Keywords:georectification, mosaicking, push-broom, UAV, hyperspectral imaging
Research Division:Engineering
Research Group:Geomatic engineering
Research Field:Photogrammetry and remote sensing
Objective Division:Plant Production and Plant Primary Products
Objective Group:Horticultural crops
Objective Field:Horticultural crops not elsewhere classified
UTAS Author:Turner, D (Dr Darren Turner)
UTAS Author:Lucieer, A (Professor Arko Lucieer)
ID Code:139353
Year Published:2020
Web of Science® Times Cited:5
Deposited By:Geography and Spatial Science
Deposited On:2020-06-11
Last Modified:2020-07-24
Downloads:2 View Download Statistics

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