{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,4,9]],"date-time":"2026-04-09T14:33:59Z","timestamp":1775745239254,"version":"3.50.1"},"reference-count":43,"publisher":"MDPI AG","issue":"4","license":[{"start":{"date-parts":[[2022,2,11]],"date-time":"2022-02-11T00:00:00Z","timestamp":1644537600000},"content-version":"vor","delay-in-days":0,"URL":"https:\/\/creativecommons.org\/licenses\/by\/4.0\/"}],"funder":[{"DOI":"10.13039\/100000203","name":"United States Geological Survey","doi-asserted-by":"publisher","award":["104bState Water Research Grant"],"award-info":[{"award-number":["104bState Water Research Grant"]}],"id":[{"id":"10.13039\/100000203","id-type":"DOI","asserted-by":"publisher"}]}],"content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":["Remote Sensing"],"abstract":"<jats:p>Algal blooms in freshwater ecosystems can negatively impact aquatic and human health. Satellite remote sensing of chlorophyll a (Chl-a) is often used to help determine the severity of algal blooms. However, satellite revisit flyover schedules may not match the erratic nature of algal blooms. Studies have paired satellite and ground-based data that were not collected on the same day, assuming Chl-a concentrations did not change significantly by the flyover date. We determined the effects of an increasing time window between satellite overpass dates and field-based collection of Chl-a on algorithms for Landsat 5, Landsat 8, and Sentinel-2, using 14 years (2006\u20132020) of Chl-a data from 10 Oklahoma reservoirs. Multiple regression models were built, and selected statistics were used to rank the time windows. The Sentinel-2 results showed strong relationships between Chl-a and satellite data collected up to a \u00b15-day window. The strength of these relationships decreased beyond a \u00b13-day time window for Landsat 8 and a \u00b11-day time window for Landsat 5. Our results suggest that the time window between field sampling and satellite overpass can impact the use of satellite data for Chl-a monitoring in reservoirs. Furthermore, longer time windows can be used with higher resolution (spatial, spectral) satellites.<\/jats:p>","DOI":"10.3390\/rs14040846","type":"journal-article","created":{"date-parts":[[2022,2,11]],"date-time":"2022-02-11T05:14:43Z","timestamp":1644556483000},"page":"846","update-policy":"https:\/\/doi.org\/10.3390\/mdpi_crossmark_policy","source":"Crossref","is-referenced-by-count":36,"title":["Effect of Time Window on Satellite and Ground-Based Data for Estimating Chlorophyll-a in Reservoirs"],"prefix":"10.3390","volume":"14","author":[{"given":"Priya","family":"Kayastha","sequence":"first","affiliation":[{"name":"Environmental Science Graduate Program, Oklahoma State University, Stillwater, OK 74078, USA"}]},{"given":"Andrew R.","family":"Dzialowski","sequence":"additional","affiliation":[{"name":"Department of Integrative Biology, Oklahoma State University, Stillwater, OK 74078, USA"}]},{"given":"Scott H.","family":"Stoodley","sequence":"additional","affiliation":[{"name":"Environmental Science Graduate Program, Oklahoma State University, Stillwater, OK 74078, USA"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-9307-2799","authenticated-orcid":false,"given":"Kevin L.","family":"Wagner","sequence":"additional","affiliation":[{"name":"Oklahoma Water Resources Center, Division of Agricultural Sconce and Natural Resources, Oklahoma State University, Stillwater, OK 74078, USA"}]},{"ORCID":"https:\/\/orcid.org\/0000-0003-1600-5837","authenticated-orcid":false,"given":"Abubakarr S.","family":"Mansaray","sequence":"additional","affiliation":[{"name":"Oklahoma Water Resources Center, Division of Agricultural Sconce and Natural Resources, Oklahoma State University, Stillwater, OK 74078, USA"}]}],"member":"1968","published-online":{"date-parts":[[2022,2,11]]},"reference":[{"key":"ref_1","doi-asserted-by":"crossref","first-page":"704","DOI":"10.1007\/BF02804901","article-title":"Harmful algal blooms and eutrophication: Nutrient sources, composition, and consequences","volume":"25","author":"Anderson","year":"2002","journal-title":"Estuaries"},{"key":"ref_2","first-page":"48","article-title":"Toxins of freshwater cyanobacteria","volume":"1","author":"Codd","year":"1984","journal-title":"Microbiol. 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