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

Type Article
Date 2018-02
Language English
Author(s) Jaud MarionORCID1, Le Dantec Nicolas1, 2, Ammann Jerome1, Grandjean Philippe3, Constantin Dragos4, Akhtman Yosef4, Barbieux KevinORCID4, Allemand Pascal3, Delacourt Christophe1, Merminod Bertrand4
Affiliation(s) 1 : Univ Bretagne Occidentale, Lab Geosci Ocean, IUEM, UMR 6538, Technopole Brest Iroise,Rue Dumont Urville, F-29280 Plouzane, France.
2 : CEREMA, Direct Eau Mer & Fleuves, 134 Rue Beauvais, F-60280 Margny Les Compiegne, France.
3 : Univ Claude Bernard Lyon 1, Univ Lyon, Lab Geol Lyon Terre Planetes Environm, UMR 5276,ENS Lyon,CNRS, F-69622 Villeurbanne, France.
4 : Ecole Polytech Fed Lausanne, Geodet Engn Lab TOPO, Batiment GC Stn 18, CH-1015 Lausanne, Switzerland.
Source Remote Sensing (2072-4292) (Mdpi), 2018-02 , Vol. 10 , N. 2 , P. 204 (15p.)
DOI 10.3390/rs10020204
WOS© Times Cited 14
Note This article belongs to the Special Issue Remote Sensing from Unmanned Aerial Vehicles (UAVs)
Keyword(s) Unmanned Aerial Vehicle (UAV), hyperspectral mapping, georectification, hyperspectral cube reconstruction
Abstract

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.

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Jaud Marion, Le Dantec Nicolas, Ammann Jerome, Grandjean Philippe, Constantin Dragos, Akhtman Yosef, Barbieux Kevin, Allemand Pascal, Delacourt Christophe, Merminod Bertrand (2018). Direct Georeferencing of a Pushbroom, Lightweight Hyperspectral System for Mini-UAV Applications. Remote Sensing, 10(2), 204 (15p.). Publisher's official version : https://doi.org/10.3390/rs10020204 , Open Access version : https://archimer.ifremer.fr/doc/00638/74998/