A Comprehensive BRF Model for SpectralonⓇ and Application to Hyperspectral Field Imagery

We present a comprehensive hyperspectral bi-directional reflectance model for a pristine optical-grade white Spectralon panel with full azimuthal coverage, a wide range of view zenith angles, and incident illumination zenith angles, throughout ultraviolet (UV), visible near-infrared (VNIR), and shortwave infrared (SWIR) wavelengths (350–2500 nm). Measurements were acquired using the Goniometer of the Rochester Institute of Technology-Two (GRIT-T), which incorporates Analytical Spectral Device (ASD) FieldSpec Full-Range 4 (FR4) spectroradiometers. Residual plots show that the empirical model is accurate to within 1%–2% reflectance within most of the observing hemisphere. We demonstrate an application of the Spectralon panel model to hyperspectral imagery (HSI) acquired during a field experiment at the RIT Tait Preserve where a pair of field Spectralon panels was imaged from various view geometries from both drone and mast-mounted hyperspectral imaging systems.