Mapping stem volume in fast-growing eucalypt plantations: integrating spectral, textural, and temporal remote sensing information with forest inventories and spatial models - Réseau télédétection INRAE
Article Dans Une Revue Annals of Forest Science Année : 2024

Mapping stem volume in fast-growing eucalypt plantations: integrating spectral, textural, and temporal remote sensing information with forest inventories and spatial models

Résumé

Key message Accurate volume estimation in Eucalyptus plantation stands was achieved by a linear model using SPOT and Landsat multispectral imagery, specifically texture indices and pixel-scale NDVI time integrals, which reflect the local plantation growth history. Spatial modelling techniques such as Kriging with External Drift and Generalized Additive Model slightly improved predictions by accounting for spatial correlation of volume between sample points.

Context Forest inventories are widely used to estimate stand production. To capture the inherent spatial variability within stands, spatial modelling techniques such as Kriging with External Drift (KED) and the generalized additive model (GAM) have emerged. These models incorporate information on spatial correlation and auxiliary variables that can be obtained from satellite imagery.

Aims Our study explored the use of reflectance data from SPOT and Landsat multispectral imagery. We focused on texture indices and temporal integration of vegetation indices as auxiliary variables in KED and GAM to predict stem volume of fast-growing Eucalyptus sp. plantations in Brazil.

Methods

The components extracted from the high-resolution SPOT-6 image included spectral band values, band ratio metrics, key vegetation indices (NDVI, SAVI, and ARVI), texture measurements, and indices derived from texture analysis. Additionally, we included the accumulated NDVI time series acquired from Landsat 5, 7, and 8 satellites between the planting date and the forest inventory measurement date.

Results

The best linear model of stem volume using remotely sensed predictors gave an R-squared value of 0.95 and a Root Mean Square Error (RMSE) of 12.44 m 3 /ha. The R-squared increased to 0.96 and the RMSE decreased to 10.6 m 3 /ha when the same predictors were included as auxiliary variables in the KED and GAM spatial models.

Conclusion

The linear model using remotely sensed predictors contributed most to volume prediction, but the addition of spatial coordinates in the KED and GAM spatial models improved local volume predictions.

Fichier principal
Vignette du fichier
Alo-AFS-2024-CC-BY.pdf (2.65 Mo) Télécharger le fichier
Origine Fichiers éditeurs autorisés sur une archive ouverte
licence

Dates et versions

hal-04746465 , version 1 (21-10-2024)

Licence

Identifiants

Citer

Lívia Lanzi Aló, Guerric Le Maire, Cláudio Roberto Thiersch, Thiago Santos Mota, Rafael Costa Pinheiro, et al.. Mapping stem volume in fast-growing eucalypt plantations: integrating spectral, textural, and temporal remote sensing information with forest inventories and spatial models. Annals of Forest Science, 2024, 81, pp.43. ⟨10.1186/s13595-024-01255-6⟩. ⟨hal-04746465⟩
0 Consultations
0 Téléchargements

Altmetric

Partager

More