Evaluation of the radiometric accuracy of images obtained by a Sequoia multispectral camera
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Publication Date: | 2020 |
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Format: | Article |
Language: | eng |
Source: | Repositório Institucional da UFRGS |
Download full: | http://hdl.handle.net/10183/220323 |
Summary: | Geometric and radiometric corrections of images obtained by remotely piloted aircraft systems (RPAS) are required for the measurement of the spectral reflectance and calculation of vegetation indices. This study aimed to determine which radiometric calibration procedures allow obtaining suborbital images with more accurate reflectance data and spectral indices based on data collected by a Sequoia multispectral camera coupled to a RPAS on black oat cultivations at the flowering stage located in Eldorado do Sul, RS, Brazil. The orthophoto mosaics were processed without and with radiometric corrections by reflectance calibration ground target and/or solar irradiance sensor of the camera, and the radiometric accuracy of these images was evaluated using spectral reflectance ground data collected by the Crop Circle canopy sensor. The results indicated that the use of a reflectance calibration ground target is recommended to increase the radiometric accuracy of photographs even if the Sequoia solar irradiance sensor is employed. The use of the light gray target in the radiometric calibration resulted in orthophotos with the mean square error of reflectance values lower than 0.01 for all the analyzed bands and spectral indices. |
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Teixeira, Alison André DominguesMendes Junior, Claudio WilsonBredemeier, ChristianNegreiros, MarceloAquino, Robson dos Santos2021-04-30T04:30:53Z20200100-6916http://hdl.handle.net/10183/220323001120058Geometric and radiometric corrections of images obtained by remotely piloted aircraft systems (RPAS) are required for the measurement of the spectral reflectance and calculation of vegetation indices. This study aimed to determine which radiometric calibration procedures allow obtaining suborbital images with more accurate reflectance data and spectral indices based on data collected by a Sequoia multispectral camera coupled to a RPAS on black oat cultivations at the flowering stage located in Eldorado do Sul, RS, Brazil. The orthophoto mosaics were processed without and with radiometric corrections by reflectance calibration ground target and/or solar irradiance sensor of the camera, and the radiometric accuracy of these images was evaluated using spectral reflectance ground data collected by the Crop Circle canopy sensor. The results indicated that the use of a reflectance calibration ground target is recommended to increase the radiometric accuracy of photographs even if the Sequoia solar irradiance sensor is employed. The use of the light gray target in the radiometric calibration resulted in orthophotos with the mean square error of reflectance values lower than 0.01 for all the analyzed bands and spectral indices.application/pdfengEngenharia Agrícola. Jaboticabal, SP. Vol. 40, n. 6 (Nov./Dez. 2020), p. 759-768NDVINDRESequoia cameraradiometricEvaluation of the radiometric accuracy of images obtained by a Sequoia multispectral camerainfo:eu-repo/semantics/articleinfo:eu-repo/semantics/otherinfo:eu-repo/semantics/publishedVersioninfo:eu-repo/semantics/openAccessreponame:Repositório Institucional da UFRGSinstname:Universidade Federal do Rio Grande do Sul (UFRGS)instacron:UFRGSTEXT001120058.pdf.txt001120058.pdf.txtExtracted Texttext/plain37756http://www.lume.ufrgs.br/bitstream/10183/220323/2/001120058.pdf.txtb2a510d98992913a3a17c84e51d49a42MD52ORIGINAL001120058.pdfTexto completo (inglês)application/pdf982869http://www.lume.ufrgs.br/bitstream/10183/220323/1/001120058.pdfb5dce9019d610244d4964e3fa312719eMD5110183/2203232021-05-07 04:51:31.510041oai:www.lume.ufrgs.br:10183/220323Repositório de PublicaçõesPUBhttps://lume.ufrgs.br/oai/requestopendoar:2021-05-07T07:51:31Repositório Institucional da UFRGS - Universidade Federal do Rio Grande do Sul (UFRGS)false |
dc.title.pt_BR.fl_str_mv |
Evaluation of the radiometric accuracy of images obtained by a Sequoia multispectral camera |
title |
Evaluation of the radiometric accuracy of images obtained by a Sequoia multispectral camera |
spellingShingle |
Evaluation of the radiometric accuracy of images obtained by a Sequoia multispectral camera Teixeira, Alison André Domingues NDVI NDRE Sequoia camera radiometric |
title_short |
Evaluation of the radiometric accuracy of images obtained by a Sequoia multispectral camera |
title_full |
Evaluation of the radiometric accuracy of images obtained by a Sequoia multispectral camera |
title_fullStr |
Evaluation of the radiometric accuracy of images obtained by a Sequoia multispectral camera |
title_full_unstemmed |
Evaluation of the radiometric accuracy of images obtained by a Sequoia multispectral camera |
title_sort |
Evaluation of the radiometric accuracy of images obtained by a Sequoia multispectral camera |
author |
Teixeira, Alison André Domingues |
author_facet |
Teixeira, Alison André Domingues Mendes Junior, Claudio Wilson Bredemeier, Christian Negreiros, Marcelo Aquino, Robson dos Santos |
author_role |
author |
author2 |
Mendes Junior, Claudio Wilson Bredemeier, Christian Negreiros, Marcelo Aquino, Robson dos Santos |
author2_role |
author author author author |
dc.contributor.author.fl_str_mv |
Teixeira, Alison André Domingues Mendes Junior, Claudio Wilson Bredemeier, Christian Negreiros, Marcelo Aquino, Robson dos Santos |
dc.subject.eng.fl_str_mv |
NDVI NDRE Sequoia camera radiometric |
topic |
NDVI NDRE Sequoia camera radiometric |
description |
Geometric and radiometric corrections of images obtained by remotely piloted aircraft systems (RPAS) are required for the measurement of the spectral reflectance and calculation of vegetation indices. This study aimed to determine which radiometric calibration procedures allow obtaining suborbital images with more accurate reflectance data and spectral indices based on data collected by a Sequoia multispectral camera coupled to a RPAS on black oat cultivations at the flowering stage located in Eldorado do Sul, RS, Brazil. The orthophoto mosaics were processed without and with radiometric corrections by reflectance calibration ground target and/or solar irradiance sensor of the camera, and the radiometric accuracy of these images was evaluated using spectral reflectance ground data collected by the Crop Circle canopy sensor. The results indicated that the use of a reflectance calibration ground target is recommended to increase the radiometric accuracy of photographs even if the Sequoia solar irradiance sensor is employed. The use of the light gray target in the radiometric calibration resulted in orthophotos with the mean square error of reflectance values lower than 0.01 for all the analyzed bands and spectral indices. |
publishDate |
2020 |
dc.date.issued.fl_str_mv |
2020 |
dc.date.accessioned.fl_str_mv |
2021-04-30T04:30:53Z |
dc.type.driver.fl_str_mv |
info:eu-repo/semantics/article info:eu-repo/semantics/other |
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info:eu-repo/semantics/publishedVersion |
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article |
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publishedVersion |
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http://hdl.handle.net/10183/220323 |
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0100-6916 |
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001120058 |
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http://hdl.handle.net/10183/220323 |
dc.language.iso.fl_str_mv |
eng |
language |
eng |
dc.relation.ispartof.pt_BR.fl_str_mv |
Engenharia Agrícola. Jaboticabal, SP. Vol. 40, n. 6 (Nov./Dez. 2020), p. 759-768 |
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info:eu-repo/semantics/openAccess |
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openAccess |
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