Regional scale rain-forest height mapping using regression-kriging of spaceborne and airborne LiDAR data: application on French GuianaReport as inadecuate




Regional scale rain-forest height mapping using regression-kriging of spaceborne and airborne LiDAR data: application on French Guiana - Download this document for free, or read online. Document in PDF available to download.

1 UMR TETIS - Territoires, Environnement, Télédétection et Information Spatiale 2 LISAH - Laboratoire d-étude des interactions entre sols, agrosystèmes et hydrosystèmes 3 UMR AMAP - Botanique et Bioinformatique de l-Architecture des Plantes 4 UPR BSEF - Biens et services des écosystèmes forestiers tropicaux 5 ECOFOG - Ecologie des forêts de Guyane 6 NOVELTIS Sté 7 Airbus Operation S.A.S. 8 BRGM - Bureau de Recherches Géologiques et Minières

Abstract : LiDAR Light Detection And Ranging remote sensing has been shown to be a good technique for the estimation of forest parameters such as canopy heights and above ground biomass. Whilst airborne LiDAR data are in general very dense but only available over small areas due to the cost of their acquisition, spaceborne LiDAR data acquired from the Geoscience Laser Altimeter System GLAS have a coarser acquisition density associated with a global cover. It is therefore valuable to analyze the integration relevance of canopy heights estimated from LiDAR sensors with ancillary data such as geological, meteorological, and phenological variables in order to propose a forest canopy height map with good precision and high spatial resolution.In this study, canopy heights extracted from both airborne and spaceborne LiDAR, were first extrapolated from available environmental data e.g. geology, slope, vegetation indices, etc

The estimated canopy height maps using random forest RF regression from the airborne or GLAS calibration datasets showed similar precisions RMSE better than 6.5 m. In order to improve the precision of the canopy height estimates regression-kriging kriging of random forest regression residuals was used. Results indicated an improvement in the RMSE decrease from 6.5 to 4.2 m for the regression-kriging maps from the GLAS dataset, and from 5.8 to 1.8 m for the regression-kriging map from the airborne LiDAR dataset. Finally, in order to investigate the impact of the spatial sampling of future LiDAR missions on the precision of canopy height estimates, six subsets were derived from the initial airborne LiDAR dataset with flight line spacing of 5, 10, 20, 30, 40 and 50 km corresponding to 0.29, 0.11, 0.08, 0.05, 0.04, and 0.03 points-km² respectively. Results indicated that using the regression-kriging approach achieved a precision of 1.8 m on the canopy height map with flight line spacing of 5 km and achieved an average RMSE of 4.8m for the configuration for the 50 km flight line spacing.

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Keywords : remote sensing cartography lidar canopy sampling environmental data

Mots-clés : CANOPEE CARTOGRAPHIE TELEDETECTION ECHANTILLONNAGE DONNEE ENVIRONNEMENTALE





Author: I. Fayad - N. Baghdadi - Jean-Stéphane Bailly - N. Barbier - V. Gond - B. Hérault - M. El Hajj - F. Fabre - José Perrin -

Source: https://hal.archives-ouvertes.fr/



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