ATMOSPHERIC CORRECTIONS OF OLI LANDSAT IMAGES WITH HORIZONTAL VISIBILITY DATA FROM FIELD OBSERVATIONS AND AIRPORT
Conteúdo do artigo principal
Resumo
The accurate use of satellite images for mapping and environmental monitoring requires the image transformation to ground reflectance through atmospheric correction. However, it is a challenge to obtain the horizontal visibility, which is used by the atmospheric correction models to estimate the aerosol optical depth. The aim of this paper is to present the comparison of atmospheric correction of OLI Landsat 8 images using horizontal visibility from field observation and from airport data. OLI images were acquired from four dates, 02/26/2014, 02/10/2014, 10/11/2015 and 04/20/2016. Field work was conducted at the same time of satellite overpass and horizontal visibility was obtained by observing targets at different distances and recording the maximum distance at which targets could be identifiable by visual inspection yielding values from 12 to 17 km. For comparison the horizontal visibility was also downloaded from METAR database for the Galeão airport, which were up to 10km. Atmospheric correction was carried out for the two sources of horizontal visibility using the Atmcor4OLI program, adapted through the 6S code. These two methods were compared through graphs and a statistical test from samples of four targets using apparent and surface reflectance. The results show that the atmospheric correction is paramount to analyze the spectral response of targets as the atmosphere interferes with the spectral characteristics of the targets from the visible to the mid infrared. In the visible the additive effects predominate while in the near and mid infrared the subtractive effects dominate. The visibility of the airport and from field observation yielded surface reflectance values which were different by the test of means at 1% and not significant at the 5%, as the field observations were not much higher than 10 km. It is concluded that an accurate source of horizontal visibility is key for obtaining correct surface reflectance values, mainly when field observation at the time of satellite overpass was not possible.
Downloads
Não há dados estatísticos.
Métricas
Carregando Métricas ...
Detalhes do artigo
Como Citar
BOLPATO, I. F.; ANTUNES, M. A. H.; GELSLEICHTER, Y. A.; ANJOS, L. H. C. dos; DEBIASI, P. ATMOSPHERIC CORRECTIONS OF OLI LANDSAT IMAGES WITH HORIZONTAL VISIBILITY DATA FROM FIELD OBSERVATIONS AND AIRPORT. Revista Brasileira de Cartografia, [S. l.], v. 69, n. 6, 2017. DOI: 10.14393/rbcv69n6-44314. Disponível em: https://seer.ufu.br/index.php/revistabrasileiracartografia/article/view/44314. Acesso em: 25 ago. 2024.
Seção
Artigos
![Licença Creative Commons](https://i.creativecommons.org/l/by/3.0/88x31.png)
Esta obra está licenciado com uma Licença Creative Commons Attribution 3.0 Unported License.
Autores que publicam nesta revista concordam com os seguintes termos:
- Autores mantém os direitos autorais e concedem à revista o direito de primeira publicação, com o trabalho simultaneamente licenciado sob a Licença Creative Commons Atribuição que permite o compartilhamento do trabalho com reconhecimento da autoria e publicação inicial nesta revista.
- Autores têm autorização para assumir contratos adicionais separadamente, para distribuição não-exclusiva da versão do trabalho publicada nesta revista (ex.: publicar em repositório institucional ou como capítulo de livro), com reconhecimento de autoria e publicação inicial nesta revista.
- Autores têm permissão e são estimulados a publicar e distribuir seu trabalho online (ex.: em repositórios institucionais ou na sua página pessoal) a qualquer ponto antes ou durante o processo editorial, já que isso pode gerar alterações produtivas, bem como aumentar o impacto e a citação do trabalho publicado (veja "O Efeito do Acesso Aberto").