Evidence of hot spot directional signature from airborne POLDER measurements

Author

Bréon, F. -M ; Vanderbilt, V. ; Leroy, M. ; Bicheron, P. ; Walthall, C.L. ; Kalshoven, J.E.

Author_Institution

CEA/DSM/LMCE, Lab. de Modelization du Climat et de l´´Environ., Gif sur Yvette, France

Volume

35

Issue

2

fYear

1997

fDate

3/1/1997 12:00:00 AM

Firstpage

479

Lastpage

484

Abstract

The POLDER instrument was flown during the BOREAS experiment over various sites and at various altitudes in the Canadian boreal forest and other nearby targets. The instrument design permits the acquisition of the directional signature of any surface cover. In particular, the high directional resolution of POLDER allows it to measure, with an unprecedented accuracy, the hot spot signature of natural targets. The authors present some typical examples of such highly anisotropic reflectance directional signatures. The ratio of the maximum reflectance (hot spot direction) to the minimum reflectance (broad area in the forward scattering hemisphere) varies with wavelength and canopy. It can be as large as six in the visible and three in the near IR

Keywords

forestry; geophysical techniques; remote sensing; BOREAS experiment; Canada; airborne POLDER; anisotropic reflectance directional signature; boreal forest; canopy; geophysical measurement technique; hot spot directional signature; infrared; land surface; maximum reflectance; minimum reflectance; natural target; optical imaging; remote sensing; surface cover; terrain mapping; vegetation mapping; visible; Aerosols; Atmospheric measurements; Geometry; Instruments; Laboratories; Light scattering; NASA; Particle measurements; Reflectivity; Wavelength measurement;

fLanguage

English

Journal_Title

Geoscience and Remote Sensing, IEEE Transactions on

Publisher

ieee

ISSN

0196-2892

Type

jour

DOI

10.1109/36.563289

Filename

563289