Initial results of the FLARE vicarious calibration network

Brandon Russell; Daniel Scharpf; Jeff Holt; Will Arnold; Chris Durell; Joe Jablonski; David Conran; Stephen Schiller; Larry Leigh; David Aaron; Pedro Valle de Carvalho e Oliveira

doi:10.1117/12.2566759

17 September 2020 Initial results of the FLARE vicarious calibration network

Brandon Russell, Daniel Scharpf, Jeff Holt, Will Arnold, Chris Durell, Joe Jablonski, David Conran, Stephen Schiller, Larry Leigh, David Aaron, Pedro Valle de Carvalho e Oliveira

Author Affiliations +

Proceedings Volume 11501, Earth Observing Systems XXV; 115010F (2020) https://doi.org/10.1117/12.2566759
Event: SPIE Optical Engineering + Applications, 2020, Online Only

Abstract

The SPecular Array Radiometric Calibration (SPARC) methodology uses convex mirrors to relay an image of the sun to a satellite, airborne sensor, or other Earth Observation platform. The signal created by SPARC can be used to derive absolute, traceable calibration coefficients of Earth remote sensing systems in the solar reflective spectrum. This technology has been incorporated into an automated, on-demand commercial calibration network called FLARE (Field Line-of-site Automated Radiance Exposure). The first station, or node, has been successfully commissioned and tested with several government and commercial satellites. Radiometric performance is being validated against existing calibration factors for Sentinel 2A and diffuse target methodologies. A radiometric uncertainty budget indicates conservative 1-sigma uncertainties that are comparable to or below existing vicarious cal/val methods for the VIS-NIR wavelengths. In addition to radiometric performance, SPARC and FLARE can be utilized for characterization of a sensor’s spatial performance. Line and Point Spread Functions, and resulting Modulation Transfer Functions, derived with SPARC mirrors are virtually identical to those measured with traditional diffuse edge targets. Ongoing development of the FLARE network includes improved radiometric calibration, web portal scheduling and data access, and planned expansion of the network to Railroad Valley Playa and Mauna Loa, Hawaii.

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Brandon Russell, Daniel Scharpf, Jeff Holt, Will Arnold, Chris Durell, Joe Jablonski, David Conran, Stephen Schiller, Larry Leigh, David Aaron, and Pedro Valle de Carvalho e Oliveira "Initial results of the FLARE vicarious calibration network", Proc. SPIE 11501, Earth Observing Systems XXV, 115010F (17 September 2020); https://doi.org/10.1117/12.2566759

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