{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,3,13]],"date-time":"2026-03-13T19:18:48Z","timestamp":1773429528551,"version":"3.50.1"},"reference-count":55,"publisher":"MDPI AG","issue":"15","license":[{"start":{"date-parts":[[2024,7,30]],"date-time":"2024-07-30T00:00:00Z","timestamp":1722297600000},"content-version":"vor","delay-in-days":0,"URL":"https:\/\/creativecommons.org\/licenses\/by\/4.0\/"}],"funder":[{"DOI":"10.13039\/501100002946","name":"German Aerospace Center","doi-asserted-by":"publisher","award":["50EW2101A"],"award-info":[{"award-number":["50EW2101A"]}],"id":[{"id":"10.13039\/501100002946","id-type":"DOI","asserted-by":"publisher"}]}],"content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":["Remote Sensing"],"abstract":"<jats:p>Effective monitoring and management of inland waterbodies depend on reliable assessments of water quality through remote sensing technologies. Match-up analysis plays a significant role in investigating the comparability between in situ and remote sensing data of physical and biogeochemical variables. By exploring different spatial aggregations and temporal windows, we aimed to identify which configurations are most effective and which are less effective for the assessment of remotely sensed water quality data within the context of governmental monitoring programs. Therefore, in this study, remote sensing data products, including the variables of Secchi depth, chlorophyll-a, and turbidity, derived from the Copernicus satellites Sentinel-2 and Sentinel-3, were compared with in situ laboratory data from &gt;100 waterbodies (lakes and reservoirs) in Germany, covering a period of 5 years (2016\u20132020). Processing was carried out using two different processing schemes, CyanoAlert from Brockmann Consult GmbH and eoapp AQUA from EOMAP GmbH &amp; Co. KG, in order to analyze the influence of different processors on the results. To investigate appropriate spatial aggregations and time windows for validation (the match-up approach), we performed a statistical comparison of different spatial aggregations (1 pixel; 3 \u00d7 3, 5 \u00d7 5, and 15 \u00d7 15 macropixels; and averaging over the whole waterbody) and time windows (same day, \u00b11 day, and \u00b15 days). The results show that waterbody-wide values achieved similar accuracies and biases compared with the macropixel variants, despite the large differences in spatial aggregation and spatial variability. An expansion of the temporal window to up to \u00b15 days did not impair the agreement between the in situ and remote sensing data for most target variables and sensor\u2013processor combinations, while resulting in a marked rise in the number of matches.<\/jats:p>","DOI":"10.3390\/rs16152798","type":"journal-article","created":{"date-parts":[[2024,7,30]],"date-time":"2024-07-30T17:08:34Z","timestamp":1722359314000},"page":"2798","update-policy":"https:\/\/doi.org\/10.3390\/mdpi_crossmark_policy","source":"Crossref","is-referenced-by-count":19,"title":["Exploring Spatial Aggregations and Temporal Windows for Water Quality Match-Up Analysis Using Sentinel-2 MSI and Sentinel-3 OLCI Data"],"prefix":"10.3390","volume":"16","author":[{"given":"Tanja","family":"Schr\u00f6der","sequence":"first","affiliation":[{"name":"Helmholtz-Centre for Environmental Research\u2014UFZ, 39114 Magdeburg, Germany"}]},{"ORCID":"https:\/\/orcid.org\/0000-0003-0051-6480","authenticated-orcid":false,"given":"Susanne I.","family":"Schmidt","sequence":"additional","affiliation":[{"name":"Helmholtz-Centre for Environmental Research\u2014UFZ, 39114 Magdeburg, Germany"}]},{"given":"Rebecca D.","family":"Kutzner","sequence":"additional","affiliation":[{"name":"Institut f\u00fcr Seenforschung, 88085 Langenargen, Germany"},{"name":"Forschungsinstitut f\u00fcr Bergbaufolgelandschaften e.V., 03238 Finsterwalde, Germany"}]},{"given":"Hendrik","family":"Bernert","sequence":"additional","affiliation":[{"name":"EOMAP GmbH & Co. KG, 82229 Seefeld, Germany"}]},{"given":"Kerstin","family":"Stelzer","sequence":"additional","affiliation":[{"name":"Brockmann Consult GmbH, 21029 Hamburg, Germany"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-7769-0818","authenticated-orcid":false,"given":"Kurt","family":"Friese","sequence":"additional","affiliation":[{"name":"Helmholtz-Centre for Environmental Research\u2014UFZ, 39114 Magdeburg, Germany"}]},{"ORCID":"https:\/\/orcid.org\/0000-0003-0864-6722","authenticated-orcid":false,"given":"Karsten","family":"Rinke","sequence":"additional","affiliation":[{"name":"Helmholtz-Centre for Environmental Research\u2014UFZ, 39114 Magdeburg, Germany"}]}],"member":"1968","published-online":{"date-parts":[[2024,7,30]]},"reference":[{"key":"ref_1","doi-asserted-by":"crossref","first-page":"941","DOI":"10.1890\/1051-0761(2000)010[0941:EAEOWS]2.0.CO;2","article-title":"Entering an Era of Water Scarcity: The Challenges Ahead","volume":"10","author":"Postel","year":"2000","journal-title":"Ecol. 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