Correlated-k Based Fast, Accurate Bandpass Radiance and Transmittance Calculations for Hyperspectral and Multispectral Scenes
SPECTRAL SCIENCES INC BURLINGTON MA
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The ability to rapidly calculate at-sensor radiance over a large number of lines of sight LOSs is critical for hyperspectral and multispectral scene simulations and look-up table generation, both of which are increasingly used for sensor design, performance evaluation, data analysis, and software and systems evaluations. We have demonstrated a new radiation transport RT capability that combines an efficient multiple-LOS MLOS multiple scattering MS algorithm with a broad-bandpass correlated-k methodology called kURT-MS, where kURT stands for correlated-k-based Ultra-fast Radiative Transfer. The MLOS capability is based on DISORT and exploits the existing MODTRAN-DISORT interface. kURT-MS is a new sensor-specific fast radiative transfer formalism for UV-visible to LWIR wavelengths that is derived from MODTRANs correlated-k parameters. Scattering parameters, blackbody and solar functions are cast as a few sensor-specific and bandpass-specific k-dependent source terms for radiance computations. Preliminary transmittance results are within 2 of MODTRAN with a two-orders-of-magnitude computational savings. Preliminary radiance computations in the visible spectrum are within a few percent of MODTRAN results but with orders of magnitude speed up over comparable MODTRAN runs. This new RT capability embodied in two software packages kURT-MS and MODTRAN-kURT has potential applications for remote sensing applications such as hyperspectral scene simulation and look-up table generation for atmospheric compensation analysis as well as target acquisition algorithms for near earth scenarios.
- Computer Programming and Software
- Optical Detection and Detectors