[Effects of multi-angle hyperspectral polarized reflection by forest soil]

Area of Science:

• Geophysics
• Remote Sensing
• Soil Science

Background:

• Understanding forest soil characteristics is crucial for ecological monitoring.
• Remote sensing offers a non-invasive method for soil analysis.
• Polarized reflectance properties of soil are not fully understood.

Purpose of the Study:

• To investigate the impact of multi-angle hyperspectral polarized reflections on forest soil.
• To determine how various factors influence soil spectral characteristics.
• To provide a theoretical basis for optimizing remote sensing of forest soils.

Main Methods:

• Measurement of forest soil samples using multi-angle hyperspectral polarized reflections.
• Analysis of data considering viewing zenith angles, incidence angles, relative azimuth angles, and polarized states.
• Evaluation of the effects of soil water content and soil granule size.

Main Results:

• Factors like viewing angles, water content, and soil granule size affect reflectance values but not spectral features.
• Larger incidence and viewing zenith angles increase polarized reflectance.
• Diffuse reflection occurs in dry soil; polarized reflection appears with moisture, decreasing as moisture increases.
• Larger soil granules and rougher surfaces reduce polarized reflectance.

Conclusions:

• Spectral characteristics must be considered for effective remote sensing sensor system design.
• Optimal sensor parameters include specific incidence and viewing zenith angles, considering target sheltering.
• This research provides a new method for soil character detection and a basis for future studies on polarized reflection.