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Quantitative airborne inventories in dense tropical forest using imaging spectroscopy

Laybros Anthony, Aubry-Kientz Mélaine, Feret Jean Baptiste, Bedeau Caroline, Brunaux Olivier, Derroire Géraldine, Vincent Grégoire. 2020. Quantitative airborne inventories in dense tropical forest using imaging spectroscopy. Remote Sensing, 12:1577, 27 p.

Journal article ; Article de recherche ; Article de revue à facteur d'impact Revue en libre accès total
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Abstract : Tropical forests have exceptional floristic diversity, but their characterization remains incomplete, in part due to the resource intensity of in-situ assessments. Remote sensing technologies can provide valuable, cost-effective, large-scale insights. This study investigates the combined use of airborne LiDAR and imaging spectroscopy to map tree species at landscape scale in French Guiana. Binary classifiers were developed for each of 20 species using linear discriminant analysis (LDA), regularized discriminant analysis (RDA) and logistic regression (LR). Complementing visible and near infrared (VNIR) spectral bands with short wave infrared (SWIR) bands improved the mean average classification accuracy of the target species from 56.1% to 79.6%. Increasing the number of non-focal species decreased the success rate of target species identification. Classification performance was not significantly affected by impurity rates (confusion between assigned classes) in the non-focal class (up to 5% of bias), provided that an adequate criterion was used for adjusting threshold probability assignment. A limited number of crowns (30 crowns) in each species class was sufficient to retrieve correct labels effectively. Overall canopy area of target species was strongly correlated to their basal area over 118 ha at 1.5 ha resolution, indicating that operational application of the method is a realistic prospect (R2 = 0.75 for six major commercial tree species).

Mots-clés Agrovoc : Spectroscopie, Télédétection, Biodiversité, forêt tropicale, forêt dense, Inventaire forestier

Mots-clés géographiques Agrovoc : Guyane française

Mots-clés libres : Tropical forest, Species diversity, Hyperspectral, LiDAR

Classification Agris : U30 - Research methods
K10 - Forestry production

Champ stratégique Cirad : CTS 1 (2019-) - Biodiversité

Auteurs et affiliations

  • Laybros Anthony, IRD (FRA) - auteur correspondant
  • Aubry-Kientz Mélaine, INRA (FRA)
  • Feret Jean Baptiste, INRAE (FRA)
  • Bedeau Caroline, ONF (GUF)
  • Brunaux Olivier, ONF (GUF)
  • Derroire Géraldine, CIRAD-ES-UMR Ecofog (GUF) ORCID: 0000-0001-7239-2881
  • Vincent Grégoire, IRD (FRA)

Source : Cirad-Agritrop (https://agritrop.cirad.fr/596181/)

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