Estimation of forest canopy leaf area index using directional ASAS measurements

Author

Johnson, Lee F. ; Peterson, David L.

Author_Institution

Johnson Controls World Services, NASA Ames Res. Center, Moffett Field, CA, USA

Volume

3

fYear

1994

fDate

8-12 Aug 1994

Firstpage

1819

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 (θ_V), solar zenith angle (θ _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

Keywords

forestry; geophysical techniques; infrared imaging; remote sensing; Advanced Solid-State Array Spectroradiometer; IR visible infrared; LAI; airborne method; canopy; directional ASAS; forest forestry; geophysical measurement technique; land surface; leaf area index using; light reflectance; nadir-view illumination direction; normalized difference vegetation index NDVI; offnadir; optical imaging; red; remote sensing; solar zenith angle; terrain mapping; vegetation mapping NIR; view angle; view zenith angle; Area measurement; Atmospheric modeling; Data acquisition; Iron; NASA; Reflectivity; Sensor arrays; Solid state circuits; Spectroradiometers; Vegetation;

fLanguage

English

Publisher

ieee

Conference_Titel

Geoscience and Remote Sensing Symposium, 1994. IGARSS '94. Surface and Atmospheric Remote Sensing: Technologies, Data Analysis and Interpretation., International

Conference_Location

Pasadena, CA

Print_ISBN

0-7803-1497-2

Type

conf

DOI

10.1109/IGARSS.1994.399575

Filename

399575