Bathysent - A Method to Retrieve Coastal Bathymetry from Sentinel-2
Résumé
This paper presents a method for deriving shallow to intermediate (1m to 50m) coastal bathymetry from space-borne multispectral data taking advantage of the short time-lag between sensors' bands. The idea is to quantify local waves' characteristics (wavelengths and celerities) that are related to the water depths using optical data: local spectral analysis can provide the significant wavelengths and inter-band offset-tracking and the corresponding celerities (knowing the inter-band time-lag). Such an approach was firstly described in [1]. However, for an application to extended areas and using large data sets (as possible with the Sentinel-2 archive), a faster technique is required: the ability of processing large areas and data acquired at different dates is required for actual operational uses. The approach we propose here is based on Fast Fourier Transform analysis in order to simultaneously extract the wavelengths and celerities.
Mots clés
Sea measurements
Wavelength measurement
Optical sensors
Extraterrestrial measurements
Satellites
Underwater vehicles
bathymetry
fast Fourier transforms
ocean waves
oceanographic techniques
remote sensing
spectral analysis
local waves
water depths
optical data
local spectral analysis
inter-band time-lag
Sentinel-2 archive
Fast Fourier Transform analysis
bathysent
coastal bathymetry
space-borne multispectral data
inter-band offset-tracking
waves
space-borne optical data