Reflectances of SPOT multispectral images associated with the turbidity of the Upper Gulf of California

[EN] The use of satellite images for the observation and measurement of marine turbidity has been developed mainly with ocean colour sensors, such as MODIS. These images have a maximum spatial resolution of 250 m in their visible and infrared bands. In this research, images of the SPOT sensors were...

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Detalhes bibliográficos
Autores: Aguilar-Maldonado, J. A., Santamaría-del-Ángel, E., Sebastiá-Frasquet, M. T.
Formato: artículo
Fecha de publicación:2017
País:España
Recursos:Universitat Politècnica de València (UPV)
Repositorio:RiuNet. Repositorio Institucional de la Universitat Politécnica de Valéncia
Idioma:inglés
OAI Identifier:oai:riunet.upv.es:10251/93822
Acesso em linha:https://riunet.upv.es/handle/10251/93822
Access Level:acceso abierto
Palavra-chave:Upper Gulf of California
Colorado River Delta
Turbidity
Multispectral images
SPOT
MODIS
Secchi Disk
Alto Golfo de California
Delta del Río Colorado
Turbidez
Imágenes multiespectrales
Disco de Secchi
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oai_identifier_str oai:riunet.upv.es:10251/93822
network_acronym_str ES
network_name_str España
repository_id_str
dc.title.none.fl_str_mv Reflectances of SPOT multispectral images associated with the turbidity of the Upper Gulf of California
Reflectancias de imágenes multiespectrales de SPOT asociadas a la turbidez en el Alto Golfo de California
title Reflectances of SPOT multispectral images associated with the turbidity of the Upper Gulf of California
spellingShingle Reflectances of SPOT multispectral images associated with the turbidity of the Upper Gulf of California
Aguilar-Maldonado, J. A.
Upper Gulf of California
Colorado River Delta
Turbidity
Multispectral images
SPOT
MODIS
Secchi Disk
Alto Golfo de California
Delta del Río Colorado
Turbidez
Imágenes multiespectrales
Disco de Secchi
title_short Reflectances of SPOT multispectral images associated with the turbidity of the Upper Gulf of California
title_full Reflectances of SPOT multispectral images associated with the turbidity of the Upper Gulf of California
title_fullStr Reflectances of SPOT multispectral images associated with the turbidity of the Upper Gulf of California
title_full_unstemmed Reflectances of SPOT multispectral images associated with the turbidity of the Upper Gulf of California
title_sort Reflectances of SPOT multispectral images associated with the turbidity of the Upper Gulf of California
dc.creator.none.fl_str_mv Aguilar-Maldonado, J. A.
Santamaría-del-Ángel, E.
Sebastiá-Frasquet, M. T.
author Aguilar-Maldonado, J. A.
author_facet Aguilar-Maldonado, J. A.
Santamaría-del-Ángel, E.
Sebastiá-Frasquet, M. T.
author_role author
author2 Santamaría-del-Ángel, E.
Sebastiá-Frasquet, M. T.
author2_role author
author
dc.contributor.none.fl_str_mv Repositorio Institucional de la Universitat Politècnica de València Riunet
dc.subject.none.fl_str_mv Upper Gulf of California
Colorado River Delta
Turbidity
Multispectral images
SPOT
MODIS
Secchi Disk
Alto Golfo de California
Delta del Río Colorado
Turbidez
Imágenes multiespectrales
Disco de Secchi
topic Upper Gulf of California
Colorado River Delta
Turbidity
Multispectral images
SPOT
MODIS
Secchi Disk
Alto Golfo de California
Delta del Río Colorado
Turbidez
Imágenes multiespectrales
Disco de Secchi
description [EN] The use of satellite images for the observation and measurement of marine turbidity has been developed mainly with ocean colour sensors, such as MODIS. These images have a maximum spatial resolution of 250 m in their visible and infrared bands. In this research, images of the SPOT sensors were chosen as an alternative to overcome this limited spatial resolution. The objective was to prove the suitability of SPOT to measure turbidity in areas with great spatial variability. As a first step, all the images were standardized and the SPOT wavelength that had the largest association in the Principal Component Analysis was chosen (PCA). The results show that the bands of a SPOT multispectral image are highly redundant. The wavelength of the 610-680 nm (S2610-680) obtained the best association in 89% of the 73 images analysed. The SPOT reflectance (Rrs) (S2610-680) was compared with MODIS 620-670 nm (M1620-670), which has already been tested in other research and has proved to be adequate for measuring turbidity. Both sensors performance was similar for low and moderate reflectance but for high reflectance, SPOT (S2610-680) had a better performance than MODIS (M1620-670). Additionally, the SPOT Rrs (S2610-680) was associated with standardized Secchi disk depth data, which were measured in situ, to check SPOT suitability. SPOT Rrs (S2610-680)images were classified into: 1) cold or warm season, 2) spring tide or neap tide and 3) water flux or reflux. These constructed scenarios allowed to see the result of the Standardized Space Anomalies, which showed the continuous presence of low and medium values in the most oceanic region of the Upper Gulf of California (UGC) and very high values in all the scenarios in the intertidal zone. This research has shown that SPOT Rrs (S2610-680) is useful for observing, differentiating and measuring turbidity patterns in areas with very high spatial variability.
publishDate 2017
dc.date.none.fl_str_mv 2017
2017-12-26
dc.type.none.fl_str_mv journal article
http://purl.org/coar/resource_type/c_6501
VoR
http://purl.org/coar/version/c_970fb48d4fbd8a85
dc.type.openaire.fl_str_mv info:eu-repo/semantics/article
format article
dc.identifier.none.fl_str_mv https://riunet.upv.es/handle/10251/93822
url https://riunet.upv.es/handle/10251/93822
dc.language.none.fl_str_mv Inglés
eng
language_invalid_str_mv Inglés
language eng
dc.rights.none.fl_str_mv open access
http://purl.org/coar/access_right/c_abf2
Reconocimiento - No comercial - Sin obra derivada (by-nc-nd)
http://creativecommons.org/licenses/by-nc-nd/4.0/
dc.rights.openaire.fl_str_mv info:eu-repo/semantics/openAccess
rights_invalid_str_mv open access
http://purl.org/coar/access_right/c_abf2
Reconocimiento - No comercial - Sin obra derivada (by-nc-nd)
http://creativecommons.org/licenses/by-nc-nd/4.0/
eu_rights_str_mv openAccess
dc.format.none.fl_str_mv application/pdf
dc.publisher.none.fl_str_mv Universitat Politècnica de València
publisher.none.fl_str_mv Universitat Politècnica de València
dc.source.none.fl_str_mv reponame:RiuNet. Repositorio Institucional de la Universitat Politécnica de Valéncia
instname:Universitat Politècnica de València (UPV)
instname_str Universitat Politècnica de València (UPV)
reponame_str RiuNet. Repositorio Institucional de la Universitat Politécnica de Valéncia
collection RiuNet. Repositorio Institucional de la Universitat Politécnica de Valéncia
repository.name.fl_str_mv
repository.mail.fl_str_mv
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spelling Reflectances of SPOT multispectral images associated with the turbidity of the Upper Gulf of CaliforniaReflectancias de imágenes multiespectrales de SPOT asociadas a la turbidez en el Alto Golfo de CaliforniaAguilar-Maldonado, J. A.Santamaría-del-Ángel, E.Sebastiá-Frasquet, M. T.Upper Gulf of CaliforniaColorado River DeltaTurbidityMultispectral imagesSPOTMODISSecchi DiskAlto Golfo de CaliforniaDelta del Río ColoradoTurbidezImágenes multiespectralesDisco de Secchi[EN] The use of satellite images for the observation and measurement of marine turbidity has been developed mainly with ocean colour sensors, such as MODIS. These images have a maximum spatial resolution of 250 m in their visible and infrared bands. In this research, images of the SPOT sensors were chosen as an alternative to overcome this limited spatial resolution. The objective was to prove the suitability of SPOT to measure turbidity in areas with great spatial variability. As a first step, all the images were standardized and the SPOT wavelength that had the largest association in the Principal Component Analysis was chosen (PCA). The results show that the bands of a SPOT multispectral image are highly redundant. The wavelength of the 610-680 nm (S2610-680) obtained the best association in 89% of the 73 images analysed. The SPOT reflectance (Rrs) (S2610-680) was compared with MODIS 620-670 nm (M1620-670), which has already been tested in other research and has proved to be adequate for measuring turbidity. Both sensors performance was similar for low and moderate reflectance but for high reflectance, SPOT (S2610-680) had a better performance than MODIS (M1620-670). Additionally, the SPOT Rrs (S2610-680) was associated with standardized Secchi disk depth data, which were measured in situ, to check SPOT suitability. SPOT Rrs (S2610-680)images were classified into: 1) cold or warm season, 2) spring tide or neap tide and 3) water flux or reflux. These constructed scenarios allowed to see the result of the Standardized Space Anomalies, which showed the continuous presence of low and medium values in the most oceanic region of the Upper Gulf of California (UGC) and very high values in all the scenarios in the intertidal zone. This research has shown that SPOT Rrs (S2610-680) is useful for observing, differentiating and measuring turbidity patterns in areas with very high spatial variability.[ES] El uso de imágenes de satélite para la observación y medida de la turbidez marina se ha desarrollado principalmente con sensores de color del océano como MODIS. Estas imágenes tienen una resolución espacial máxima de 250 m en las bandas visible e infrarroja. En esta investigación, se eligieron imágenes del sensor SPOT como alternativa para superar esta limitada resolución espacial. El objetivo es probar la validez de SPOT para medir turbidez en áreas con gran variabilidad espacial. Como primer paso se normalizaron todas las imágenes y se eligió la longitud de onda de SPOT que mejor ajuste obtuvo a partir del Análisis de Componentes Principales (ACP). Los resultados mostraron que las bandas de una imagen multiespectral SPOT tienen una alta redundancia (buena correlación) entre sí. La longitud de onda de los 610-680 nm (S2610-680) fue la que obtuvo el mejor ajuste en 89% de las 73 imágenes analizadas. Esta reflectancia (Rrs) (S2610-680) de SPOT fue comparada con MODIS (M1620-670). El comportamiento de ambos sensores fue similar para reflectancias bajas y medias, pero para altas reflectancias SPOT Rrs (S2610-680) tuvo un mejor rendimiento que MODIS. Además, la Rrs (S2610-680) de SPOT fue asociada con datos in situ normalizados de profundidad del disco de Secchi para comprobar la idoneidad del sensor SPOT. Las imágenes Rrs (S2610-680) de SPOT fueron clasificadas en: 1) época fría o cálida, 2) marea viva o muerta, y 3) flujo o reflujo de las aguas. Estos escenarios seleccionados permitieron ver el resultado de las Anomalías Espaciales Normalizadas, que dejaron ver la continua presencia de valores bajos y medios en la región más oceánica del Alto Golfo de California (AGC) y valores muy altos en todos los escenarios en la zona intermareal del AGC. El trabajo realizado permite concluir que la reflectancia Rrs (S2610-680) de SPOT es válida para observar, diferenciar y medir patrones de turbidez en áreas con una elevada variabilidad espacial.Universitat Politècnica de ValènciaRepositorio Institucional de la Universitat Politècnica de València Riunet20172017-12-26journal articlehttp://purl.org/coar/resource_type/c_6501VoRhttp://purl.org/coar/version/c_970fb48d4fbd8a85info:eu-repo/semantics/articleapplication/pdfhttps://riunet.upv.es/handle/10251/93822reponame:RiuNet. Repositorio Institucional de la Universitat Politécnica de Valénciainstname:Universitat Politècnica de València (UPV)Inglésengopen accesshttp://purl.org/coar/access_right/c_abf2Reconocimiento - No comercial - Sin obra derivada (by-nc-nd) http://creativecommons.org/licenses/by-nc-nd/4.0/info:eu-repo/semantics/openAccessoai:riunet.upv.es:10251/938222026-06-13T07:49:27Z
score 15,301603

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