Details
| Original language | English |
|---|---|
| Pages (from-to) | 28215-28230 |
| Number of pages | 16 |
| Journal | Optics express |
| Volume | 32 |
| Issue number | 16 |
| Publication status | Published - 22 Jul 2024 |
Abstract
This study presents what we believe is the first extensive assessment of the water reflectance products from the German hyperspectral Environmental Mapping and Analysis Program (EnMAP). We evaluate EnMAP’s standard normalized water leaving reflectance [ρ W]N over 17 water sites in the first two years of the mission. The EnMAP [ρ W]N standard product is generated by a dedicated water atmospheric correction (AC) called the Modular Inversion Program (MIP). The quality of the [ρ W]N retrievals was assessed using in situ hyperspectral measurements and Aerosol Robotic Network - Ocean Colour (AERONET-OC) multispectral measurements. The results showed very good agreement between in situ hyperspectral match-ups and EnMAP [ρ W]N, with an underestimation of EnMAP of −17.37% (bias, β) and an error (ϵ) of 23.75% at 418 – 797 nm. Two other AC processors were also investigated: the polynomial based algorithm applied to MERIS (Polymer) and the atmospheric correction for OLI lite (Acolite). The intercomparison exercise between the three AC methods applied to EnMAP data using the hyperspectral match-up dataset showed better statistical metrics for MIP (ϵ = 23%, β = −17.37%) compared to Polymer (ϵ = 42.20%, β = −2.43%) and Acolite (ϵ = 97%, β = 97%). The superior performance of MIP was further confirmed by the validation results obtained with the multispectral match-up dataset; MIP retrievals show good agreement with in situ measurements at the majority of study sites. Conversely, Polymer and Acolite retrievals tended to overestimate, especially in clearer waters as the Lampedusa study site.
ASJC Scopus subject areas
- Physics and Astronomy(all)
- Atomic and Molecular Physics, and Optics
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In: Optics express, Vol. 32, No. 16, 22.07.2024, p. 28215-28230.
Research output: Contribution to journal › Article › Research › peer review
}
TY - JOUR
T1 - Full mission evaluation of EnMAP water leaving reflectance products using three atmospheric correction processors
AU - Soppa, Mariana A.
AU - Brell, Maximilian
AU - Chabrillat, Sabine
AU - Alvarado, Leonardo M.A.
AU - Gege, Peter
AU - Plattner, Stefan
AU - Somlai-Schweiger, Ian
AU - Schroeder, Thomas
AU - Steinmetz, François
AU - Scheffler, Daniel
AU - Brando, Vittorio E.
AU - Bresciani, Mariano
AU - Giardino, Claudia
AU - Colella, Simone
AU - Vansteenwegen, Dieter
AU - Langheinrich, Maximilian
AU - Carmona, Emiliano
AU - Bachmann, Martin
AU - Pato, Miguel
AU - Fischer, Sebastian
AU - Bracher, Astrid
N1 - Publisher Copyright: © 2024 Optica Publishing Group.
PY - 2024/7/22
Y1 - 2024/7/22
N2 - This study presents what we believe is the first extensive assessment of the water reflectance products from the German hyperspectral Environmental Mapping and Analysis Program (EnMAP). We evaluate EnMAP’s standard normalized water leaving reflectance [ρ W]N over 17 water sites in the first two years of the mission. The EnMAP [ρ W]N standard product is generated by a dedicated water atmospheric correction (AC) called the Modular Inversion Program (MIP). The quality of the [ρ W]N retrievals was assessed using in situ hyperspectral measurements and Aerosol Robotic Network - Ocean Colour (AERONET-OC) multispectral measurements. The results showed very good agreement between in situ hyperspectral match-ups and EnMAP [ρ W]N, with an underestimation of EnMAP of −17.37% (bias, β) and an error (ϵ) of 23.75% at 418 – 797 nm. Two other AC processors were also investigated: the polynomial based algorithm applied to MERIS (Polymer) and the atmospheric correction for OLI lite (Acolite). The intercomparison exercise between the three AC methods applied to EnMAP data using the hyperspectral match-up dataset showed better statistical metrics for MIP (ϵ = 23%, β = −17.37%) compared to Polymer (ϵ = 42.20%, β = −2.43%) and Acolite (ϵ = 97%, β = 97%). The superior performance of MIP was further confirmed by the validation results obtained with the multispectral match-up dataset; MIP retrievals show good agreement with in situ measurements at the majority of study sites. Conversely, Polymer and Acolite retrievals tended to overestimate, especially in clearer waters as the Lampedusa study site.
AB - This study presents what we believe is the first extensive assessment of the water reflectance products from the German hyperspectral Environmental Mapping and Analysis Program (EnMAP). We evaluate EnMAP’s standard normalized water leaving reflectance [ρ W]N over 17 water sites in the first two years of the mission. The EnMAP [ρ W]N standard product is generated by a dedicated water atmospheric correction (AC) called the Modular Inversion Program (MIP). The quality of the [ρ W]N retrievals was assessed using in situ hyperspectral measurements and Aerosol Robotic Network - Ocean Colour (AERONET-OC) multispectral measurements. The results showed very good agreement between in situ hyperspectral match-ups and EnMAP [ρ W]N, with an underestimation of EnMAP of −17.37% (bias, β) and an error (ϵ) of 23.75% at 418 – 797 nm. Two other AC processors were also investigated: the polynomial based algorithm applied to MERIS (Polymer) and the atmospheric correction for OLI lite (Acolite). The intercomparison exercise between the three AC methods applied to EnMAP data using the hyperspectral match-up dataset showed better statistical metrics for MIP (ϵ = 23%, β = −17.37%) compared to Polymer (ϵ = 42.20%, β = −2.43%) and Acolite (ϵ = 97%, β = 97%). The superior performance of MIP was further confirmed by the validation results obtained with the multispectral match-up dataset; MIP retrievals show good agreement with in situ measurements at the majority of study sites. Conversely, Polymer and Acolite retrievals tended to overestimate, especially in clearer waters as the Lampedusa study site.
UR - http://www.scopus.com/inward/record.url?scp=85199962659&partnerID=8YFLogxK
U2 - 10.1364/OE.523813
DO - 10.1364/OE.523813
M3 - Article
C2 - 39538643
AN - SCOPUS:85199962659
VL - 32
SP - 28215
EP - 28230
JO - Optics express
JF - Optics express
SN - 1094-4087
IS - 16
ER -