{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2025,10,12]],"date-time":"2025-10-12T03:56:29Z","timestamp":1760241389658,"version":"build-2065373602"},"reference-count":63,"publisher":"MDPI AG","issue":"2","license":[{"start":{"date-parts":[[2018,1,26]],"date-time":"2018-01-26T00:00:00Z","timestamp":1516924800000},"content-version":"vor","delay-in-days":0,"URL":"https:\/\/creativecommons.org\/licenses\/by\/4.0\/"}],"funder":[{"DOI":"10.13039\/501100001659","name":"Deutsche Forschungsgemeinschaft","doi-asserted-by":"publisher","award":["DFG-GSC 81","GR1540\/21-1","GR1540\/29-1"],"award-info":[{"award-number":["DFG-GSC 81","GR1540\/21-1","GR1540\/29-1"]}],"id":[{"id":"10.13039\/501100001659","id-type":"DOI","asserted-by":"publisher"}]},{"DOI":"10.13039\/501100006360","name":"Federal Ministry for Economic Affairs and Energy","doi-asserted-by":"publisher","award":["50EE1020"],"award-info":[{"award-number":["50EE1020"]}],"id":[{"id":"10.13039\/501100006360","id-type":"DOI","asserted-by":"publisher"}]}],"content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":["Remote Sensing"],"abstract":"<jats:p>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.<\/jats:p>","DOI":"10.3390\/rs10020181","type":"journal-article","created":{"date-parts":[[2018,1,26]],"date-time":"2018-01-26T11:29:02Z","timestamp":1516966142000},"page":"181","update-policy":"https:\/\/doi.org\/10.3390\/mdpi_crossmark_policy","source":"Crossref","is-referenced-by-count":12,"title":["Retrieval of Water Constituents from Hyperspectral In-Situ Measurements under Variable Cloud Cover\u2014A Case Study at Lake Stechlin (Germany)"],"prefix":"10.3390","volume":"10","author":[{"given":"Anna","family":"G\u00f6ritz","sequence":"first","affiliation":[{"name":"Department of Civil, Geo and Environmental Engineering, Remote Sensing Technology, Technical University of Munich (TUM), Arcisstr. 21, D-80333 M\u00fcnchen, Germany"},{"name":"German Aerospace Center, Remote Sensing Technology Institute, M\u00fcnchner Str. 20, Oberpfaffenhofen, D-82234We\u00dfling, Germany"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-8835-545X","authenticated-orcid":false,"given":"Stella","family":"Berger","sequence":"additional","affiliation":[{"name":"Department of Experimental Limnology, Leibniz-Institute of Freshwater Ecology and Inland Fisheries, Alte Fischerh\u00fctte 2, D-16775 Stechlin, Germany"}]},{"ORCID":"https:\/\/orcid.org\/0000-0003-0939-5267","authenticated-orcid":false,"given":"Peter","family":"Gege","sequence":"additional","affiliation":[{"name":"German Aerospace Center, Remote Sensing Technology Institute, M\u00fcnchner Str. 20, Oberpfaffenhofen, D-82234We\u00dfling, Germany"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-9141-0325","authenticated-orcid":false,"given":"Hans-Peter","family":"Grossart","sequence":"additional","affiliation":[{"name":"Department of Experimental Limnology, Leibniz-Institute of Freshwater Ecology and Inland Fisheries, Alte Fischerh\u00fctte 2, D-16775 Stechlin, Germany"},{"name":"Institute of Biochemistry and Biology, Potsdam University, Maulbeerallee 2, D-14476 Potsdam, Germany"}]},{"given":"Jens","family":"Nejstgaard","sequence":"additional","affiliation":[{"name":"Department of Experimental Limnology, Leibniz-Institute of Freshwater Ecology and Inland Fisheries, Alte Fischerh\u00fctte 2, D-16775 Stechlin, Germany"}]},{"given":"Sebastian","family":"Riedel","sequence":"additional","affiliation":[{"name":"German Aerospace Center, Remote Sensing Technology Institute, M\u00fcnchner Str. 20, Oberpfaffenhofen, D-82234We\u00dfling, Germany"},{"name":"Earth Observation and Modelling, Department of Geography, Kiel University, Ludewig-Meyn-Str. 14, D-24098 Kiel, Germany"}]},{"given":"R\u00fcdiger","family":"R\u00f6ttgers","sequence":"additional","affiliation":[{"name":"Helmholtz-Zentrum Geesthacht, Center for Materials and Coastal Research, Institute for Coastal Research, Max Planck Str. 1, D-21502 Geesthacht, Germany"}]},{"given":"Christian","family":"Utschig","sequence":"additional","affiliation":[{"name":"Helmholtz-Zentrum Geesthacht, Center for Materials and Coastal Research, Institute for Coastal Research, Max Planck Str. 1, D-21502 Geesthacht, Germany"}]}],"member":"1968","published-online":{"date-parts":[[2018,1,26]]},"reference":[{"key":"ref_1","unstructured":"Platt, T., Hoepffner, N., Stuart, V., and Brown, C. 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