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Detailed validation of the bidirectional effect in various Case I and Case II waters
Arthur C R Gleason1, Kenneth J Voss, Howard R Gordon
1Physics Department, University of Miami, Coral Gables, FL 33124, USA. art.gleason@miami.edu
Optics Express
|March 29, 2012
Summary
Simulated bidirectional reflectance distribution functions (BRDF) accurately model Case II waters using fixed phase functions. Case I waters require variable phase functions for precise BRDF corrections, enhancing underwater optical modeling.
Area of Science:
- Ocean optics
- Remote sensing
- Light scattering
Background:
- Bidirectional Reflectance Distribution Functions (BRDF) are crucial for understanding light interaction with water surfaces.
- Accurate BRDF modeling is essential for remote sensing applications and underwater visibility.
- Case I and Case II waters exhibit distinct optical properties influencing light scattering.
Purpose of the Study:
- To compare simulated BRDFs with in-situ measurements beneath the water surface.
- To evaluate the effectiveness of different phase function models in Case I and Case II waters.
- To determine optimal BRDF correction strategies for varying water types.
Main Methods:
- Simulated BRDFs using variable and fixed particle scattering phase functions.
- Comparison of simulation results with measured optical data.
- Analysis of model performance based on water type (Case I vs. Case II).
Main Results:
- Simulations with variable phase functions (dependent on chlorophyll) showed closer agreement with Case I water data.
- Simulations with fixed phase functions performed well and were similar in Case II water.
- BRDF corrections in Case II waters are feasible with average phase functions.
Conclusions:
- Variable particle scattering phase functions are necessary for accurate BRDF modeling in Case I waters.
- Fixed particle scattering phase functions are sufficient for BRDF corrections in Case II waters.
- The findings support tailored BRDF correction approaches for different oceanic optical conditions.
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