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Open AccessTechnical Note

Direct Georeferencing of a Pushbroom, Lightweight Hyperspectral System for Mini-UAV Applications

1
Laboratoire Géosciences Océan—UMR 6538, Université de Bretagne Occidentale, IUEM, Technopôle Brest-Iroise, Rue Dumont d’Urville, F-29280 Plouzané, France
2
CEREMA, Direction Eau Mer et Fleuves, 134 Rue de Beauvais, F-60280 Margny-lès-Compiègne, France
3
Laboratoire de Géologie de Lyon, Terre, Planètes, Environnement—UMR 5276, Université de Lyon, Université Claude Bernard Lyon 1, ENS Lyon, CNRS, F-69622 Villeurbanne, France
4
Geodetic Engineering Laboratory (TOPO), École Polytécthnique Fédéral de Lausanne (EPFL), Batiment GC Station 18, CH-1015 Lausanne, Switzerland
*
Author to whom correspondence should be addressed.
Remote Sens. 2018, 10(2), 204; https://doi.org/10.3390/rs10020204
Received: 4 December 2017 / Revised: 24 January 2018 / Accepted: 27 January 2018 / Published: 30 January 2018
(This article belongs to the Special Issue Remote Sensing from Unmanned Aerial Vehicles (UAVs))
Hyperspectral imagery has proven its potential in many research applications, especially in the field of environmental sciences. Currently, hyperspectral imaging is generally performed by satellite or aircraft platforms, but mini-UAV (Unmanned Aerial Vehicle) platforms (<20 kg) are now emerging. On such platforms, payload restrictions are critical, so sensors must be selected according to stringent specifications. This article presents the integration of a light pushbroom hyperspectral sensor onboard a multirotor UAV, which we have called Hyper-DRELIO (Hyperspectral DRone for Environmental and LIttoral Observations). This article depicts the system design: the UAV platform, the imaging module, the navigation module, and the interfacing between the different elements. Pushbroom sensors offer a better combination of spatial and spectral resolution than full-frame cameras. Nevertheless, data georectification has to be performed line by line, the quality of direct georeferencing being limited by mechanical stability, good timing accuracy, and the resolution and accuracy of the proprioceptive sensors. A georegistration procedure is proposed for geometrical pre-processing of hyperspectral data. The specifications of Hyper-DRELIO surveys are described through two examples of surveys above coastal or inland waters, with different flight altitudes. This system can collect hyperspectral data in VNIR (Visible and Near InfraRed) domain above small study sites (up to about 4 ha) with both high spatial resolution (<10 cm) and high spectral resolution (1.85 nm) and with georectification accuracy on the order of 1 to 2 m. View Full-Text
Keywords: Unmanned Aerial Vehicle (UAV); hyperspectral mapping; georectification; hyperspectral cube reconstruction Unmanned Aerial Vehicle (UAV); hyperspectral mapping; georectification; hyperspectral cube reconstruction
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MDPI and ACS Style

Jaud, M.; Le Dantec, N.; Ammann, J.; Grandjean, P.; Constantin, D.; Akhtman, Y.; Barbieux, K.; Allemand, P.; Delacourt, C.; Merminod, B. Direct Georeferencing of a Pushbroom, Lightweight Hyperspectral System for Mini-UAV Applications. Remote Sens. 2018, 10, 204.

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