6533b836fe1ef96bd12a1c88

RESEARCH PRODUCT

Conversion of nadir, narrowband reflectance in red and near-infrared channels to hemispherical surface albedo

Ernesto López-baezaMa ChladilJosé A. ValienteManuel NuñezMj Russell

subject

Tree canopybusiness.industryNear-infrared spectroscopySoil ScienceBeer–Lambert lawGeologyVegetationAlbedoMultispectral Scannersymbols.namesakeNarrowbandOpticssymbolsNadirEnvironmental scienceComputers in Earth SciencesbusinessRemote sensing

description

Abstract Measured nadir-viewed narrow-band reflectanees in red and near infrared channels simulating AVHRR Channels 1 and 2 are compared with measured integrated solar spectrum hemispherical albedos. Reflectanees 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%.

yearjournalcountryeditionlanguage
1997-07-01Remote Sensing of Environment
https://doi.org/10.1016/s0034-4257(96)00218-0