[Study of Retrieving the Sandy Surface Roughness Land Based on the Bidirectional Reflectance Model]

Area of Science:

• Earth and Environmental Sciences
• Remote Sensing
• Geomorphology

Context:

• Wind erosion significantly alters semiarid sandy land structure.
• Accurate assessment of surface composition and roughness is vital for wind erosion modeling.
• Remote sensing offers a non-invasive method for spatiotemporal analysis of sandy surfaces.

Purpose:

• To analyze the impact of artificial sand furrow orientation on sandy land's bidirectional reflectance distribution.
• To investigate the relationship between surface structure, bidirectional reflectance factor, and sandy surface roughness.
• To validate a reflectance model for simulating sandy land optical properties and retrieving roughness parameters.

Summary:

• Field measurements using multi-angular and hyperspectral data revealed that sand furrow orientation (parallel or perpendicular to incident light) influences sandy land's bidirectional reflectance distribution.
• Perpendicular furrows increased backward scattering, while parallel furrows expanded its range.
• A validated reflectance model demonstrated its utility in simulating sandy land optical properties and retrieving surface roughness.

Impact:

• Provides a method for quantifying sandy land structural information through reflectance measurements.
• Offers valuable insights into the intrinsic optical properties and texture inversion of sandy lands.
• Enhances understanding of how structural information affects the optical properties of sandy surfaces for improved remote sensing applications.