Marine Science Faculty Publications
Spectral Interdependence of Remote-sensing Reflectance and its Implications on the Design of Ocean Color Satellite Sensors
Document Type
Article
Publication Date
2014
Digital Object Identifier (DOI)
https://doi.org/10.1364/AO.53.003301
Abstract
Using 901 remote-sensing reflectance spectra (Rrs(λ),sr−1">��rs(��),sr−1Rrs(λ),sr−1 , λ">��λ from 400 to 700 nm with a 5 nm resolution), we evaluated the correlations of Rrs(λ)">��rs(��)Rrs(λ) between neighboring spectral bands in order to characterize (1) the spectral interdependence of Rrs(λ)">��rs(��)Rrs(λ) at different bands and (2) to what extent hyperspectral Rrs(λ)">��rs(��)Rrs(λ) can be reconstructed from multiband measurements. The 901 Rrs">��rsRrs spectra were measured over a wide variety of aquatic environments in which water color varied from oceanic blue to coastal green or brown, with chlorophyll-a concentrations ranging from ∼0.02">∼0.02∼0.02 to >100 mg m−3">>100 mg m−3>100 mg m−3 , bottom depths from ∼1 m">∼1 m∼1 m to >1000 m">>1000 m>1000 m , and bottom substrates including sand, coral reef, and seagrass. The correlation coefficient of Rrs(λ)">��rs(��)Rrs(λ) between neighboring bands at center wavelengths λk">����λk and λl">����λl , rΔλ(λk,λl)">��Δ��(����,����)rΔλ(λk,λl) , was evaluated systematically, with the spectral gap (Δλ=λl−λk">Δ��=����−����Δλ=λl−λk ) changing between 5, 10, 15, 20, 25, and 30 nm, respectively. It was found that rΔλ">��Δ��rΔλ decreased with increasing Δλ">Δ��Δλ , but remained >0.97">>0.97>0.97 for Δλ≤20 nm">Δ��≤20 nmΔλ≤20 nm for all spectral bands. Further, using 15 spectral bands between 400 and 710 nm, we reconstructed, via multivariant linear regression, hyperspectral Rrs(λ)">��rs(��)Rrs(λ) (from 400 to 700 nm with a 5 nm resolution). The percentage difference between measured and reconstructed Rrs">��rsRrs for each band in the 400–700 nm range was generally less than 1%, with a correlation coefficient close to 1.0. The mean absolute error between measured and reconstructed Rrs">��rsRrs was about 0.00002 sr−1">0.00002 sr−10.00002 sr−1 for each band, which is significantly smaller than the Rrs">��rsRrs uncertainties from all past and current ocean color satellite radiometric products. These results echo findings of earlier studies that Rrs">��rsRrs measurements at ∼15">∼15∼15 spectral bands in the visible domain can provide nearly identical spectral information as with hyperspectral (contiguous bands at 5 nm spectral resolution) measurements. Such results provide insights for data storage and handling of large volume hyperspectral data as well as for the design of future ocean color satellite sensors.
Was this content written or created while at USF?
Yes
Citation / Publisher Attribution
Applied Optics, v. 53, issue 15, p. 3301-3310
Scholar Commons Citation
Lee, Zhongping; Shang, Shaoling; Hu, Chuanmin; and Zibordi, Giuseppe, "Spectral Interdependence of Remote-sensing Reflectance and its Implications on the Design of Ocean Color Satellite Sensors" (2014). Marine Science Faculty Publications. 1925.
https://digitalcommons.usf.edu/msc_facpub/1925
