EO·Atlas
piSOFIT
Compiled from public sources on 2026-05-25. Not independently verified by Pixxel.
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Atmospheric correction processing chain used by Pixxel for Firefly hyperspectral imagery. Pixxel implementation of the NASA JPL ISOFIT optimal-estimation framework, with a neural-network MODTRAN radiative-transfer emulator, superpixel aerosol and water-vapour retrieval, and per-pixel Bayesian uncertainty propagation. Produces Level-2A surface reflectance with uncertainty layers from upstream Level-1 radiance.
piSOFIT is Pixxel's atmospheric correction processing chain for Firefly hyperspectral imagery.[1] It implements the NASA JPL ISOFIT optimal-estimation framework[2] with a neural-network radiative-transfer emulator in place of direct MODTRAN calls, enabling computationally tractable per-pixel inversions at hyperspectral-scale data volumes.[1] Superpixel-based aerosol and water-vapour retrieval uses spatial context from neighbouring pixels to improve aerosol optical depth estimates before per-pixel Bayesian inversion.[1] The chain accepts Firefly Level-1 radiance as input and produces Level-2A surface reflectance with per-pixel posterior uncertainty layers.[1] The underlying ISOFIT codebase is publicly available as an open-source repository.[2]
- [1]Atmospheric Correction - piSOFIT modeloperator engineering2026-05-25
- [2]ISOFIT framework public repositoryagency doc2026-05-25