{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,2,10]],"date-time":"2026-02-10T16:15:04Z","timestamp":1770740104828,"version":"3.49.0"},"reference-count":46,"publisher":"MDPI AG","issue":"2","license":[{"start":{"date-parts":[[2014,2,20]],"date-time":"2014-02-20T00:00:00Z","timestamp":1392854400000},"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>Monitoring chlorophyll-a (chl-a) concentrations is important for the management of water quality, because it is a good indicator of the eutrophication level in an aquatic system. Thus, our main purpose was to develop an alternative technique to monitor chl-a in time and space through remote sensing techniques. However, one of the limitations of remote sensing is the resolution. To achieve a high temporal resolution and medium space resolution, we used the Moderate Resolution Imaging Spectroradiometer (MODIS) 500-m reflectance product, MOD09GA, and limnological parameters from the Itumbiara Reservoir. With these data, an empirical (O14a) and semi-empirical (O14b) algorithm were developed. Algorithms were cross-calibrated and validated using three datasets: one for each campaign and a third consisting of a combination of the two individual campaigns. Algorithm O14a produced the best validation with a root mean square error (RMSE) of 30.4%, whereas O14b produced an RMSE of 32.41% using the mixed dataset calibration. O14a was applied to MOD09GA to build a time series for the reservoir for the year of 2009. The time-series analysis revealed that there were occurrences of algal blooms in the summer that were likely related to the additional input of nutrients caused by rainfall runoff. During the winter, however, the few observed algal blooms events were related to periods of atmospheric meteorological variations that represented an enhanced external influence on the processes of mixing and stratification of the water column. Finally, the use of remote sensing techniques can be an important tool for policy makers, environmental managers and the scientific community with which to monitor water quality.<\/jats:p>","DOI":"10.3390\/rs6021634","type":"journal-article","created":{"date-parts":[[2014,2,20]],"date-time":"2014-02-20T11:08:24Z","timestamp":1392894504000},"page":"1634-1653","update-policy":"https:\/\/doi.org\/10.3390\/mdpi_crossmark_policy","source":"Crossref","is-referenced-by-count":21,"title":["Performance Analysis of MODIS 500-m Spatial  Resolution Products for Estimating Chlorophyll-a Concentrations in Oligo- to Meso-Trophic Waters  Case Study: Itumbiara Reservoir, Brazil"],"prefix":"10.3390","volume":"6","author":[{"ORCID":"https:\/\/orcid.org\/0000-0001-6328-0001","authenticated-orcid":false,"given":"Igor","family":"Ogashawara","sequence":"first","affiliation":[{"name":"Remote Sensing Division, National Institute for Space Research (INPE), Avenida dos Astronautas, S\u00e3o Jos\u00e9 dos Campos-SP 1758, Brazil"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Enner","family":"Alc\u00e2ntara","sequence":"additional","affiliation":[{"name":"Cartography Engineering Department, State University of S\u00e3o Paulo, Rua Roberto Simonsen, 305, Presidente Prudente-SP 19060-900, Brazil"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Marcelo","family":"Curtarelli","sequence":"additional","affiliation":[{"name":"Remote Sensing Division, National Institute for Space Research (INPE), Avenida dos Astronautas, S\u00e3o Jos\u00e9 dos Campos-SP 1758, Brazil"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"ORCID":"https:\/\/orcid.org\/0000-0003-4247-4477","authenticated-orcid":false,"given":"Marcos","family":"Adami","sequence":"additional","affiliation":[{"name":"Regional Center for the Amazon, National Institute for Space Research (INPE), Parque da Ci\u00eancia e Tecnologia do Guam\u00e1, Bel\u00e9m-PA 2651, Brazil"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Renata","family":"Nascimento","sequence":"additional","affiliation":[{"name":"Geopixel-Solu\u00e7\u00f5es em Geotecnologias, Rua Maestro Egydio Pinto, 190,  S\u00e3o Jos\u00e9 dos Campos-SP 12245-902, Brazil"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Arley","family":"Souza","sequence":"additional","affiliation":[{"name":"ETEP Faculdades, Avenida Bar\u00e3o Rio Branco, 882, S\u00e3o Jos\u00e9 dos Campos-SP 12242-800, Brazil"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Jos\u00e9","family":"Stech","sequence":"additional","affiliation":[{"name":"Remote Sensing Division, National Institute for Space Research (INPE), Avenida dos Astronautas, S\u00e3o Jos\u00e9 dos Campos-SP 1758, Brazil"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Milton","family":"Kampel","sequence":"additional","affiliation":[{"name":"Remote Sensing Division, National Institute for Space Research (INPE), Avenida dos Astronautas, S\u00e3o Jos\u00e9 dos Campos-SP 1758, Brazil"}],"role":[{"role":"author","vocabulary":"crossref"}]}],"member":"1968","published-online":{"date-parts":[[2014,2,20]]},"reference":[{"key":"ref_1","doi-asserted-by":"crossref","first-page":"1133","DOI":"10.1590\/S1519-69842008000500020","article-title":"Reservoirs and human well being: New challenges for evaluating impacts and benefits in the neotropics","volume":"68","author":"Tundisi","year":"2008","journal-title":"Braz. 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