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Journal Articles Sensors Year : 2010

Observing the Forest Canopy with a New Ultra-Violet Compact Airborne Lidar

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Abstract

We have developed a new airborne UV lidar for the forest canopy and deployed it in the Landes forest (France). It is the first one that: (i) operates at 355 nm for emitting energetic pulses of 16 mJ at 20 Hz while fulfilling eye-safety regulations and (ii) is flown onboard an ultra-light airplane for enhanced flight flexibility. Laser footprints at ground level were 2.4 m wide for a flying altitude of 300 m. Three test areas of ~500 × 500 m2 with Maritime pines of different ages were investigated. We used a threshold method adapted for this lidar to accurately extract from its waveforms detailed forest canopy vertical structure: canopy top, tree crown base and undergrowth heights. Good detection sensitivity enabled the observation of ground returns underneath the trees. Statistical and one-to-one comparisons with ground measurements by field foresters indicated a mean absolute accuracy of ~1 m. Sensitivity tests on detection threshold showed the importance of signal to noise ratio and footprint size for a proper detection of the canopy vertical structure. This UV-lidar is intended for future innovative applications of simultaneous observation of forest canopy, laser-induced vegetation fluorescence and atmospheric aerosols.
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Dates and versions

hal-00510579 , version 1 (06-05-2019)

Licence

Attribution - CC BY 4.0

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Juan Cuesta, Patrick Chazette, Tristan Allouis, Pierre H. Flamant, Sylvie Durrieu, et al.. Observing the Forest Canopy with a New Ultra-Violet Compact Airborne Lidar. Sensors, 2010, 10 (8), pp.7386-7403. ⟨10.3390/s100807386⟩. ⟨hal-00510579⟩
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