Very high resolution mapping of coral reef state using airborne bathymetric LiDAR surface-intensity and drone imagery - Archive ouverte HAL Access content directly
Journal Articles International Journal of Remote Sensing Year : 2018

Very high resolution mapping of coral reef state using airborne bathymetric LiDAR surface-intensity and drone imagery

(1) , (2) , (3) , (4) , (4) , (5) , (5) , (5) , (5) , (5) , (6) , (7) , (7) , (8) , (9)
1
2
3
4
5
6
7
8
9

Abstract

Very high resolution (VHR) airborne data enable detection and physical measurements of individual coral reef colonies. The bathymetric LiDAR system, as an active remote sensing technique, accurately computes the coral reef ecosystem’s surface and reflectance using a single green wavelength at the decimetre scale over 1-to-100 km2 areas. A passive multispectral camera mounted on an airborne drone can build a blue-green-red (BGR) orthorectified mosaic at the centimetre scale over 0.01-to-0.1 km2 areas. A combination of these technologies is used for the first time here to map coral reef ecological state at the submeter scale. Airborne drone BGR values (0.03 m pixel size) serve to calibrate airborne bathymetric LiDAR surface and intensity data (0.5 m pixel size). A classification of five ecological states is then mapped through an artificial neural network (ANN). The classification was developed over a small area (0.01 km2) in the lagoon of Moorea Island (French Polynesia) at VHR (0.5 m pixel size) and then extended to the whole lagoon (46.83 km2). The ANN was first calibrated with 275 samples to determine the class of coral state through LiDAR-based predictors; then, the classification was validated through 135 samples, reaching a satisfactory performance (overall accuracy = 0.75).
Fichier principal
Vignette du fichier
author_version.pdf (1.99 Mo) Télécharger le fichier
Origin : Files produced by the author(s)
Loading...

Dates and versions

hal-01848266 , version 1 (24-07-2018)

Identifiers

Cite

Antoine Collin, Camille Ramambason, Yves Pastol, Elisa Casella, Alessio Rovere, et al.. Very high resolution mapping of coral reef state using airborne bathymetric LiDAR surface-intensity and drone imagery. International Journal of Remote Sensing, In press, ⟨10.1080/01431161.2018.1500072⟩. ⟨hal-01848266⟩
302 View
515 Download

Altmetric

Share

Gmail Facebook Twitter LinkedIn More