[The research on bidirectional reflectance computer simulation of forest canopy at pixel scale]

Area of Science:

• Computer graphics and simulation
• Radiative transfer modeling
• Forest ecosystem analysis

Context:

• Realistic 3D vegetation scene generation is crucial for canopy regime simulation.
• Simulating forest canopy bidirectional reflectance at pixel scale presents computational challenges due to complex tree structures.
• Existing radiosity methods struggle with the high number of facets required for detailed forest models.

Purpose:

• To expand computer simulation models for forest canopy bidirectional reflectance at pixel scale.
• To address the computational limitations of simulating complex forest structures using the radiosity method.
• To propose a simplified forest crown model for efficient simulation.

Summary:

• The study simplifies forest crowns to ellipsoids, valuing their optical characteristics based on photon energy transmission.
• A geometrical optics model and gap model are integrated to compute forest canopy bidirectional reflectance at pixel scale.
• Simulation results align with the GOMS model and Multi-angle Imaging SpectroRadiometer (MISR) data, demonstrating model validity.

Impact:

• The research provides a valuable method for multi-angle remote sensing applications.
• It aids in the inversion of vegetation canopy structure parameters.
• The simplified model enhances the efficiency of simulating complex forest ecosystems.