Use este identificador para citar ou linkar para este item: http://www.alice.cnptia.embrapa.br/alice/handle/doc/952219
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dc.contributor.authorLOEBMANN, D. G. dos S. W.pt_BR
dc.contributor.authorVICENTE, L. E.pt_BR
dc.contributor.authorDE PAULA, S. C.pt_BR
dc.contributor.authorVICTORIA, D. de C.pt_BR
dc.contributor.authorANDRADE, R. G.pt_BR
dc.contributor.authorSILVA, R. F. B. DApt_BR
dc.contributor.authorAGNESE, M. L.pt_BR
dc.date.accessioned2013-03-05T23:34:54Z-
dc.date.available2013-03-05T23:34:54Z-
dc.date.created2013-03-05pt_BR
dc.date.issued2012pt_BR
dc.identifier.citationIn: SYMPOSIUM SELPER, 15., 2012, Cayenne, French Guiana. Abstracts... Cayenne: SELPER, 2012.pt_BR
dc.identifier.urihttp://www.alice.cnptia.embrapa.br/alice/handle/doc/952219pt_BR
dc.descriptionRemote sensing by spectral imaging of the Earth's surface can be widely used, but only when the atmospheric influence is nullified and the data are reduced to surface reflectance units. The atmospheric correction referred to here is an atmospheric "compensation" or "characterization" in which algorithms are used in remote sensing applications for hyper and multispectral images to correct atmospheric propagation effects in measurements taken by airborne and orbital systems. The remission of atmospheric effects guarantees the identification of biophysical properties of the targets and their isonomic relationship with spectroradiometric databases, thus enabling the application of sophisticated classification methods such as linear Spectral Mixture Analysis models (SMA) and Spectral Indexes. Based on this premise, the objective of this article is to compare the atmospheric correction used in the MODTRAN model with that used in the Dark Object Subtraction (DOS1) and Improved Dark Object Subtraction (DOS2) models in order to verify which approach shows better correspondence with reference spectral libraries. We used spectral data on tropical soils obtained using the spectroradiometer (FieldSpec Full Resolution). Due to the difficulty in obtaining data on atmospheric conditions, especially for tropical regions, and the difficulty in accessing the most reliable correction procedures, corrections are sometimes disregarded or even based on extremely simple methods which may produce radiance and reflectance estimation errors even greater than tho se of the original images. MODTRAN presented the most consistent results, especially with regard to season variation and the presence of haze (low contrast) in some images due to the high aerosol concentration. This kind of atmospheric phenomenon is common in tropical regions, which shows the importance of considering local atmospheric correction parameters based on an atmosphere simulation model. Methods DO S1 and DOS2, in spite of their good performance in some of the analyzed areas, have not been effective in the suppression of effects related to atmospheric absorption. This work is one of the few that considers different test targets in a tropical environment with season variation.pt_BR
dc.language.isoengeng
dc.rightsopenAccesseng
dc.subjectSpectral imagingpt_BR
dc.titleComparative assessment of atmospheric correction of Landsat imagery using Modtran and dark object subtraction.pt_BR
dc.typeResumo em anais e proceedingspt_BR
dc.date.updated2013-03-05T23:34:54Zpt_BR
dc.subject.nalthesaurusRemote sensingpt_BR
dc.format.extent21 p.pt_BR
riaa.ainfo.id952219pt_BR
riaa.ainfo.lastupdate2013-03-05pt_BR
dc.contributor.institutionDANIEL GOMES DOS SANTOS W LOEBMANN, CNPM; LUIZ EDUARDO VICENTE, CNPM; STELLA CARVALHO DE PAULA, BOLSISTA CNPM; DANIEL DE CASTRO VICTORIA, CNPM; RICARDO GUIMARAES ANDRADE, CNPM; RAMON FELIPE BICUDO DA SILVA, UNICAMP; MAURÍCIO LOPES AGNESE, BOLSISTA CNPM.pt_BR
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