{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2025,10,11]],"date-time":"2025-10-11T02:56:41Z","timestamp":1760151401096,"version":"build-2065373602"},"reference-count":22,"publisher":"MDPI AG","issue":"7","license":[{"start":{"date-parts":[[2022,3,23]],"date-time":"2022-03-23T00:00:00Z","timestamp":1647993600000},"content-version":"vor","delay-in-days":0,"URL":"https:\/\/creativecommons.org\/licenses\/by\/4.0\/"}],"funder":[{"DOI":"10.13039\/501100007133","name":"Ag\u00eancia Nacional de Energia El\u00e9trica","doi-asserted-by":"publisher","award":["PD-02949-2405\/2019"],"award-info":[{"award-number":["PD-02949-2405\/2019"]}],"id":[{"id":"10.13039\/501100007133","id-type":"DOI","asserted-by":"publisher"}]}],"content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":["Remote Sensing"],"abstract":"<jats:p>This article presents the QDA-System (Sistema\u00a0Qualidade da \u00c1gua, from Portuguese), a system developed to monitor the quality of surface waters in Brazilian hydroelectric reservoirs using satellite images and cloud computing services. The development requirements of the QDA-System considered its use for operational monitoring purposes, with all processing steps automated, and a user-friendly interface to access and query the data generated automatically by the system. A pilot application of the QDA-System was customized and implemented for monitoring the Foz do Chapec\u00f3 hydroelectric reservoir located in southern Brazil. For the pilot application, the QDA-System was customized to estimate nine water quality parameters,: five were estimated directly from Sentinel-2 multispectral images and four were estimated indirectly. We expect that in the near future the QDA-System can be replicated to monitor other Brazilian reservoirs, bringing benefits and cost reduction related to water quality monitoring, not only for the sector of hydroelectric generation but for other sectors that also need similar monitoring, such as sanitation and aquaculture production.<\/jats:p>","DOI":"10.3390\/rs14071541","type":"journal-article","created":{"date-parts":[[2022,3,23]],"date-time":"2022-03-23T22:08:06Z","timestamp":1648073286000},"page":"1541","update-policy":"https:\/\/doi.org\/10.3390\/mdpi_crossmark_policy","source":"Crossref","is-referenced-by-count":2,"title":["QDA-System: A Cloud-Based System for Monitoring Water Quality in Brazilian Hydroelectric Reservoirs from Space"],"prefix":"10.3390","volume":"14","author":[{"given":"Marcelo","family":"Curtarelli","sequence":"first","affiliation":[{"name":"Funda\u00e7\u00e3o CERTI, Florian\u00f3polis 88040-970, Brazil"}]},{"given":"Edmar","family":"Neto","sequence":"additional","affiliation":[{"name":"Funda\u00e7\u00e3o CERTI, Florian\u00f3polis 88040-970, Brazil"}]},{"given":"Fanny","family":"de Siqueira","sequence":"additional","affiliation":[{"name":"Funda\u00e7\u00e3o CERTI, Florian\u00f3polis 88040-970, Brazil"}]},{"given":"Felipe","family":"Yopan","sequence":"additional","affiliation":[{"name":"Funda\u00e7\u00e3o CERTI, Florian\u00f3polis 88040-970, Brazil"}]},{"given":"Gilmar","family":"Soares","sequence":"additional","affiliation":[{"name":"Funda\u00e7\u00e3o CERTI, Florian\u00f3polis 88040-970, Brazil"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-0917-7406","authenticated-orcid":false,"given":"Gilnei","family":"Pauli","sequence":"additional","affiliation":[{"name":"Funda\u00e7\u00e3o CERTI, Florian\u00f3polis 88040-970, Brazil"}]},{"given":"Jo\u00e3o","family":"de Souza","sequence":"additional","affiliation":[{"name":"Funda\u00e7\u00e3o CERTI, Florian\u00f3polis 88040-970, Brazil"}]},{"given":"Luana","family":"Silva","sequence":"additional","affiliation":[{"name":"Funda\u00e7\u00e3o CERTI, Florian\u00f3polis 88040-970, Brazil"}]},{"given":"Marcio","family":"Sagaz","sequence":"additional","affiliation":[{"name":"Funda\u00e7\u00e3o CERTI, Florian\u00f3polis 88040-970, Brazil"}]},{"given":"Miguel","family":"Demay","sequence":"additional","affiliation":[{"name":"Funda\u00e7\u00e3o CERTI, Florian\u00f3polis 88040-970, Brazil"}]},{"given":"Nat\u00e1lia","family":"Bortolas","sequence":"additional","affiliation":[{"name":"Funda\u00e7\u00e3o CERTI, Florian\u00f3polis 88040-970, Brazil"}]},{"given":"Ricardo","family":"Yoshimura","sequence":"additional","affiliation":[{"name":"Funda\u00e7\u00e3o CERTI, Florian\u00f3polis 88040-970, Brazil"}]},{"given":"Vitor","family":"Guimar\u00e3es","sequence":"additional","affiliation":[{"name":"Funda\u00e7\u00e3o CERTI, Florian\u00f3polis 88040-970, Brazil"}]}],"member":"1968","published-online":{"date-parts":[[2022,3,23]]},"reference":[{"key":"ref_1","doi-asserted-by":"crossref","unstructured":"Topp, S.N., Pavelsky, T.M., Jensen, D., Simard, M., and Ross, M.R.V. 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