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		<isbn>978-85-17-00088-1</isbn>
		<label>59635</label>
		<citationkey>RodriguesAlcWatRotIma:2017:OLSeBa</citationkey>
		<title>OLI/Landsat-8 semi-analytical based model for retrieving Secchi disk depth in Nova Avanhandava Reservoir</title>
		<format>Internet</format>
		<year>2017</year>
		<secondarytype>PRE CN</secondarytype>
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		<author>Rodrigues, Thanan Walesza Pequeno,</author>
		<author>Alcântara, Enner Herenio,</author>
		<author>Watanabe, Fernanda Sayuri Yoshino,</author>
		<author>Rotta, Luiz Henrique da Silva,</author>
		<author>Imai, Nilton Nobuhiro,</author>
		<electronicmailaddress>twalesza@gmail.com</electronicmailaddress>
		<editor>Gherardi, Douglas Francisco Marcolino,</editor>
		<editor>Aragão, Luiz Eduardo Oliveira e Cruz de,</editor>
		<e-mailaddress>daniela.seki@inpe.br</e-mailaddress>
		<conferencename>Simpósio Brasileiro de Sensoriamento Remoto, 18 (SBSR)</conferencename>
		<conferencelocation>Santos</conferencelocation>
		<date>28-31 maio 2017</date>
		<publisher>Instituto Nacional de Pesquisas Espaciais (INPE)</publisher>
		<publisheraddress>São José dos Campos</publisheraddress>
		<pages>871-878</pages>
		<booktitle>Anais</booktitle>
		<organization>Instituto Nacional de Pesquisas Espaciais (INPE)</organization>
		<transferableflag>1</transferableflag>
		<abstract>Water clarity can be considered as the key information to assess water quality. This information can be related to the vertical visibility, analogous to the Secchi disk depth (&#119885;&#119878;&#119863;), which is measured manually with a Secchi disk or by remote sensing. The second one uses bio-optical models, however, most of them were calibrated for oceanic and coastal waters. The semi-analytical approach uses as input, the inherent optical properties (IOPs) retrieved from the quasi-analytical algorithm (QAA) designed for seawaters. Therefore, we hypothesized that error caused by the use of a semi-analytical designed for oceanic waters will prevent an accurately &#119885;&#119878;&#119863; estimation in an oligo-to-mesotrophic reservoir. Aiming to test this hypothesis, we used in situ data collected in three different dates considering OLI/Landsat-8 bands. As result, we noticed that according to the reservoir optical water quality, the estimation of &#119885;&#119878;&#119863; returned Mean Absolute Percentage Errors ranging between 12.23% and 28.10% when compared to in situ data. We also used a dataset (n = 6) collected two and three days before OLIs overpass in order to validate the model using satellite data and the errors were 9.18% and 6.32% for the 2 and 3-day delay, respectively. These results showed that QAA designed for seawaters was able to retrieve &#119885;&#119878;&#119863; in an oligo-to-mesotrophic reservoir, probably because the closed bio-optical properties from both environments, assuming to be applicable to water clarity monitoring.</abstract>
		<area>SRE</area>
		<type>Áreas úmidas e águas interiores</type>
		<language>en</language>
		<targetfile>59635.pdf</targetfile>
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