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Estimation of forest canopy leaf area index using directional ASAS measurements

Lee Johnson, David L. Peterson

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Abstract

Coniferous forest canopy reflectance was derived from radiance data collected the Advanced Solid-State Array Spectroradiometer (ASAS). Red and near-infrared (NIR) responses were examined as a function of view zenith angle (/spl theta//sub V/), solar zenith angle (/spl theta//sub S/), and site characteristics. Relationships were formulated between the normalized difference vegetation index (NDVI) and canopy leaf area index (LAI). It is suggested that the offnadir NDVI is a more stable estimator of LAI than is the nadir-view NDVI.>

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Coniferous forest canopy reflectance was derived from radiance data collected the Advanced Solid-State Array Spectroradiometer (ASAS). Red and near-infrared (NIR) responses were examined as a function of view zenith angle (/spl theta//sub V/), solar zenith angle (/spl theta//sub S/), and site characteristics. Relationships were formulated between the normalized difference vegetation index (NDVI) and canopy leaf area index (LAI). It is suggested that the offnadir NDVI is a more stable estimator of LAI than is the nadir-view NDVI.>

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Available abstract

Coniferous forest canopy reflectance was derived from radiance data collected the Advanced Solid-State Array Spectroradiometer (ASAS). Red and near-infrared (NIR) responses were examined as a function of view zenith angle (/spl theta//sub V/), solar zenith angle (/spl theta//sub S/), and site characteristics. Relationships were formulated between the normalized difference vegetation index (NDVI) and canopy leaf area index (LAI). It is suggested that the offnadir NDVI is a more stable estimator of LAI than is the nadir-view NDVI.>

Key concepts: Zenith, Normalized Difference Vegetation Index, Nadir, Remote sensing, Radiance, Spectroradiometer, Canopy, Leaf area index

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