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Conversion of Nadir, Narrowband Reflectance in Red and Near-Infrared Channels to Hemispherical Surface Albedo

Citation

Russell, MJ and Nunez, M and Chladil, MA and Valiente, JA and Lopez-Baeza, E, Conversion of Nadir, Narrowband Reflectance in Red and Near-Infrared Channels to Hemispherical Surface Albedo, Remote Sensing of Environment, 61, (1) pp. 16-23. ISSN 0034-4257 (1997) [Refereed Article]

DOI: doi:10.1016/S0034-4257(96)00218-0

Abstract

Measured nadir-viewed narrow-band reflectances in red and near infrared channels simulating AVHRR Channels 1 and 2 are compared with measured integrated solar spectrum hemispherical albedos. Reflectances and albedos were measured from an aircraft over four widely different vegetation surfaces in southeastern Tasmania (Australia). A linear function is used to simultaneously correct for narrow band to broad band conversion errors and to convert nadir viewed reflectances to hemispherical albedos. While the application of the conversion equation presented is limited to the vegetation types of the study, the equation is independent of vegetation type. Results indicate that the reflectance from the rough surface of a forest canopy is not Lambertian and that the use of a directional to hemispherical albedo conversion using a Lambertian assumption may lead to errors as great as 35%. | Measured nadir-viewed narrow-band reflectances in red and near infrared channels simulating AVHRR Channels 1 and 2 are compared with measured integrated solar spectrum hemispherical albedos. Reflectances and albedos were measured from an aircraft over four widely different vegetation surfaces in southeastern Tasmania (Australia). A linear function is used to simultaneously correct for narrow band to broad band conversion errors and to convert nadir viewed reflectances to hemispherical albedos. While the application of the conversion equation presented is limited to the vegetation types of the study, the equation is independent of vegetation type. Results indicate that the reflectance from the rough surface of a forest canopy is not Lambertian and that the use of a directional to hemispherical albedo conversion using a Lambertian assumption may lead to errors as great as 35%.

Item Details

Item Type:Refereed Article
Research Division:Engineering
Research Group:Geomatic Engineering
Research Field:Photogrammetry and Remote Sensing
Objective Division:Environment
Objective Group:Atmosphere and Weather
Objective Field:Atmospheric Processes and Dynamics
Author:Russell, MJ (Dr Michael Russell)
Author:Nunez, M (Dr Manuel Nunez)
Author:Valiente, JA (Mr Jose Antonio Valiente)
ID Code:10482
Year Published:1997
Web of Science® Times Cited:21
Deposited By:Geography and Environmental Studies
Deposited On:1997-08-01
Last Modified:2011-08-11
Downloads:0

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