%0 Conference Proceedings
%4 sid.inpe.br/marte2/2017/10.23.17.06.21
%2 sid.inpe.br/marte2/2017/10.23.17.06.22
%@isbn 978-85-17-00088-1
%F 59217
%T Análise da correção geométrica por meio de função de refletância bidirecional da superfície em dados de satélite geoestacionário
%D 2017
%A Silveira Junior, Carlos Roberto da,
%A Júnior, Laerte Guimarães Ferreira,
%A Silva, Bernardo Barbosa da,
%@electronicmailaddress profcarlos.ifg@gmail.com
%E Gherardi, Douglas Francisco Marcolino,
%E Aragão, Luiz Eduardo Oliveira e Cruz de,
%B Simpósio Brasileiro de Sensoriamento Remoto, 18 (SBSR)
%C Santos
%8 28-31 maio 2017
%I Instituto Nacional de Pesquisas Espaciais (INPE)
%J São José dos Campos
%P 438-445
%S Anais
%1 Instituto Nacional de Pesquisas Espaciais (INPE)
%X The monitoring of land cover through geostationary satellite sensing images allows greater temporal resolution compared to polar satellites, providing additional information about phenology. However, the bands of red and near infrared, used to obtain much of the environmental index, have anisotropic reflectance characteristics such that the value is dependent of the geometry of observation and vegetation cover. For both are used correction techniques to eliminate this interference, refining the result, however have some limitations. This study evaluated the geometric correction using the BRDF (Bidirectional Reflectance Distribution Function) for obtaining NDVI (Normalized Difference Vegetation Index) daily by data coming from the sensor SEVIRI (Spinning Enhanced Visible and Infrared Imager) of satellite geostationary Meteosat-10, for the state of Goiás. In an evaluation for samples for classes of annual agricultural and pasture NDVI BRDF showed different from maximum, lower and average day NDVI (paired t-test, p <0.001), but is highly correlated (r²> 0.8). The calculation of the BRDF may be an obstacle to the use of high temporal resolution geostationary satellites, because requirement of number of samples per pixel and miscalculation (about 30%); however, there are alternatives that may reduce the effect of these limitations like filtering NDVI and solar azimuth angle values and use BRDF calculation parameters obtained from a previous day.
%9 Processamento de imagens
%@language pt
%3 59217.pdf