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Small-angle goniometry for backscattering measurements in the broadband spectrum
Sanna Kaasalainen1, Jouni Peltoniemi, Jyri Näränen
1Finnish Geodetic Institute, Geodeetinrinne 2 (P.O. Box 15), FIN-02431 Masala, Finland. sanna.kaasalainen@fgi.fi
Applied Optics
|March 31, 2005
Summary
This study explores spectral bidirectional reflectance distribution function (BRDF) at backscatter, revealing wavelength-dependent hot-spot signatures. These findings enhance remote sensing of land surfaces by exploiting retroreflection characteristics.
Area of Science:
- Earth and Planetary Sciences
- Geophysics
- Remote Sensing
Background:
- Bidirectional Reflectance Distribution Function (BRDF) is crucial for understanding land surface reflectance.
- Hot spots, characterized by sharp intensity peaks at backscatter, offer unique spectral information.
- Current remote sensing methods can be improved by better understanding BRDF hot-spot effects.
Purpose of the Study:
- To investigate spectral BRDF effects at backscatter, focusing on hot-spot phenomena.
- To assess new methods for laboratory and field simulations of remote sensing.
- To demonstrate the utility of hot-spot characteristics for interpreting remote sensing data.
Main Methods:
- Conducted experimental studies on spectral BRDF at backscatter.
- Analyzed the intensity peak sharpness for directional and comparative studies.
- Investigated wavelength-dependent features in hot-spot reflectance signatures.
Main Results:
- Observed extreme sharpness in the intensity peak at backscatter.
- Demonstrated wavelength-dependent features in hot-spot reflectance.
- Confirmed the feasibility of new simulation methods for remote sensing.
Conclusions:
- Hot-spot characteristics provide valuable spectral and directional information.
- Exploiting hot-spot signatures can improve the interpretation of airborne and spaceborne remote sensing data.
- The study facilitates the extension of BRDF measurements into retroreflection for natural targets.