{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,6,5]],"date-time":"2026-06-05T13:13:42Z","timestamp":1780665222449,"version":"3.54.1"},"reference-count":33,"publisher":"MDPI AG","issue":"4","license":[{"start":{"date-parts":[[2014,4,22]],"date-time":"2014-04-22T00:00:00Z","timestamp":1398124800000},"content-version":"vor","delay-in-days":0,"URL":"https:\/\/creativecommons.org\/licenses\/by\/3.0\/"}],"content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":["Remote Sensing"],"abstract":"<jats:p>Satellite remote sensing is a highly useful tool for monitoring chlorophyll-a concentration (Chl-a) in water bodies. Remote sensing algorithms based on near-infrared-red (NIR-red) wavelengths have demonstrated great potential for retrieving Chl-a in inland waters. This study tested the performance of a recently developed NIR-red based algorithm, SAMO-LUT (Semi-Analytical Model Optimizing and Look-Up Tables), using an extensive dataset collected from five Asian lakes. Results demonstrated that Chl-a retrieved by the SAMO-LUT algorithm was strongly correlated with measured Chl-a (R2 = 0.94),  and the root-mean-square error (RMSE) and normalized root-mean-square error (NRMS) were 8.9 mg\u2219m\u22123 and 72.6%, respectively. However, the SAMO-LUT algorithm yielded large errors for sites where Chl-a was less than 10 mg\u2219m\u22123 (RMSE = 1.8 mg\u2219m\u22123 and NRMS = 217.9%). This was because differences in water-leaving radiances at the NIR-red wavelengths (i.e., 665 nm, 705 nm and 754 nm) used in the SAMO-LUT were too small due to low concentrations of water constituents. Using a blue-green algorithm (OC4E) instead of the SAMO-LUT for the waters with low constituent concentrations would have reduced the RMSE and NRMS to 1.0 mg\u2219m\u22123 and 16.0%, respectively. This indicates  (1) the NIR-red algorithm does not work well when water constituent concentrations are relatively low; (2) different algorithms should be used in light of water constituent concentration; and thus (3) it is necessary to develop a classification method for selecting the appropriate algorithm.<\/jats:p>","DOI":"10.3390\/rs6043492","type":"journal-article","created":{"date-parts":[[2014,4,22]],"date-time":"2014-04-22T12:18:37Z","timestamp":1398169117000},"page":"3492-3510","update-policy":"https:\/\/doi.org\/10.3390\/mdpi_crossmark_policy","source":"Crossref","is-referenced-by-count":27,"title":["Remote Estimation of Chlorophyll-a in Inland Waters by a NIR-Red-Based Algorithm: Validation in Asian  Lakes"],"prefix":"10.3390","volume":"6","author":[{"given":"Gongliang","family":"Yu","sequence":"first","affiliation":[{"name":"Key Laboratory of Algal Biology, Institute of Hydrobiology, Chinese Academy of Sciences,  Wuhan 430072, Hubei, China"},{"name":"Graduate School of Life and Environmental Sciences, University of Tsukuba, 1-1-1 Tennoudai, Tsukuba, Ibaraki 305-8572, Japan"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Wei","family":"Yang","sequence":"additional","affiliation":[{"name":"State Key Laboratory of Earth Surface Processes and Resource Ecology,  Beijing Normal University, Beijing 100875, China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Bunkei","family":"Matsushita","sequence":"additional","affiliation":[{"name":"Graduate School of Life and Environmental Sciences, University of Tsukuba, 1-1-1 Tennoudai, Tsukuba, Ibaraki 305-8572, Japan"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Renhui","family":"Li","sequence":"additional","affiliation":[{"name":"Key Laboratory of Algal Biology, Institute of Hydrobiology, Chinese Academy of Sciences,  Wuhan 430072, Hubei, China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Yoichi","family":"Oyama","sequence":"additional","affiliation":[{"name":"Graduate School of Life and Environmental Sciences, University of Tsukuba, 1-1-1 Tennoudai, Tsukuba, Ibaraki 305-8572, Japan"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Takehiko","family":"Fukushima","sequence":"additional","affiliation":[{"name":"Graduate School of Life and Environmental Sciences, University of Tsukuba, 1-1-1 Tennoudai, Tsukuba, Ibaraki 305-8572, Japan"}],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"1968","published-online":{"date-parts":[[2014,4,22]]},"reference":[{"key":"ref_1","doi-asserted-by":"crossref","first-page":"24109","DOI":"10.1364\/OE.18.024109","article-title":"Algorithms for remote estimation of chlorophyll-a in coastal and inland waters using red and near infrared bands","volume":"18","author":"Gilerson","year":"2010","journal-title":"Opt. 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