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Retrieval of Water Constituents from Hyperspectral In-Situ Measurements under Variable Cloud Cover - A Case Study at Lake Stechlin (Germany)

Göritz, Anna and Berger, Stella and Gege, Peter and Grossart, Hans-Peter and Nejstgaard, Jens and Riedel, Sebastian and Röttgers, Rüdiger and Utschig, Christian (2018) Retrieval of Water Constituents from Hyperspectral In-Situ Measurements under Variable Cloud Cover - A Case Study at Lake Stechlin (Germany). Remote Sensing, 10 (2), pp. 181-199. Multidisciplinary Digital Publishing Institute (MDPI). DOI: 10.3390/rs10020181 ISSN 2072-4292

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Official URL: https://www.mdpi.com/2072-4292/10/2/181

Abstract

Remote sensing and field spectroscopy of natural waters is typically performed under clear skies, low wind speeds and low solar zenith angles. Such measurements can also be made, in principle, under clouds and mixed skies using airborne or in-situ measurements; however, variable illumination conditions pose a challenge to data analysis. In the present case study, we evaluated the inversion of hyperspectral in-situ measurements for water constituent retrieval acquired under variable cloud cover. First, we studied the retrieval of Chlorophyll-a (Chl-a) concentration and colored dissolved organic matter (CDOM) absorption from in-water irradiance measurements. Then, we evaluated the errors in the retrievals of the concentration of total suspended matter (TSM), Chl-a and the absorption coefficient of CDOM from above-water reflectance measurements due to highly variable reflections at the water surface. In order to approximate cloud reflections, we extended a recent three-component surface reflectance model for cloudless atmospheres by a constant offset and compared different surface reflectance correction procedures. Our findings suggest that in-water irradiance measurements may be used for the analysis of absorbing compounds even under highly variable weather conditions. The extended surface reflectance model proved to contribute to the analysis of above-water reflectance measurements with respect to Chl-a and TSM. Results indicate the potential of this approach for all-weather monitoring.

Item URL in elib:https://elib.dlr.de/126430/
Document Type:Article
Title:Retrieval of Water Constituents from Hyperspectral In-Situ Measurements under Variable Cloud Cover - A Case Study at Lake Stechlin (Germany)
Authors:
AuthorsInstitution or Email of AuthorsAuthors ORCID iD
Göritz, AnnaAnna.Goeritz (at) dlr.deUNSPECIFIED
Berger, StellaLeibniz-Institut f. Gewässerökologie und BinnenfischereiUNSPECIFIED
Gege, Peterpeter.gege (at) dlr.dehttps://orcid.org/0000-0003-0939-5267
Grossart, Hans-PeterInstitute of Biochemistry & Biology, University of Potsdam, 14476 PotsdamUNSPECIFIED
Nejstgaard, JensLeibniz-Institut f. Gewässerökologie und BinnenfischereiUNSPECIFIED
Riedel, SebastianS.Riedel (at) dlr.deUNSPECIFIED
Röttgers, RüdigerHelmholtz-Zentrum GeesthachtUNSPECIFIED
Utschig, ChristianHelmholtz-Zentrum GeesthachtUNSPECIFIED
Date:January 2018
Journal or Publication Title:Remote Sensing
Refereed publication:Yes
Open Access:Yes
Gold Open Access:Yes
In SCOPUS:Yes
In ISI Web of Science:Yes
Volume:10
DOI :10.3390/rs10020181
Page Range:pp. 181-199
Publisher:Multidisciplinary Digital Publishing Institute (MDPI)
ISSN:2072-4292
Status:Published
Keywords:remote sensing; inland water; hyperspectral measurements; in-situ; cloud; surface reflection; inversion; bio-optical modeling
HGF - Research field:Aeronautics, Space and Transport
HGF - Program:Space
HGF - Program Themes:Earth Observation
DLR - Research area:Raumfahrt
DLR - Program:R EO - Erdbeobachtung
DLR - Research theme (Project):Vorhaben Spectroscopic Methods in Remote Sensing
Location: Oberpfaffenhofen
Institutes and Institutions:Remote Sensing Technology Institute > Experimental Methods
Deposited By: Haschberger, Dr.-Ing. Peter
Deposited On:07 Feb 2019 11:09
Last Modified:14 Dec 2019 04:26

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