Title :
Validation of canopy bidirectional reflectance models with ASAS imagery of a spruce forest in Maine
Author :
Schaaf, Crystal Barker ; Li, Xiaowen ; Strahler, Alan H.
Author_Institution :
Phillips Lab., Hanscom AFB, MA, USA
Abstract :
Advanced Solid-state Array Spectroradiometer (ASAS) directional imagery of a spruce forest is used in an initial validation of the Li-Strahler geometric-optical model and the Li-Strahler hybrid geometric-optical radiative-transfer model. Although the magnitudes of the modeled principal plane bidirectional reflectances generally correspond to the ASAS measurements, the geometric-optical model results reproduce the trends of the ASAS reflectances more closely. Both models tend to overestimate the impact of mutual shadowing at large view zenith angles
Keywords :
atmospheric optics; forestry; geophysical techniques; infrared imaging; remote sensing; ASAS; ASAS imagery; Advanced Solid-state Array Spectroradiometer; Li-Strahler geometric-optical model; Maine; United States USA; bidirectional reflectance; canopy bidirectional reflectance model; forest forestry; geophysical measurement technique; hybrid geometric-optical radiative-transfer model; large view zenith angle view direction shadow; light reflection model; mutual shadowing; optical imaging; optics; remote sensing; shadow; spruce forest; validation; vegetation mapping; visible IR infrared; Bidirectional control; Geophysical measurements; Layout; Radiometry; Reflectivity; Scattering; Shadow mapping; Solid modeling; Solid state circuits; Spectroradiometers;
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
DOI :
10.1109/IGARSS.1994.399581
