7 June 2017 Radiometric sensitivity contrast metrics for spectral remote sensors
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The calculation, interpretation, and implications of radiometric sensitivity metrics for Earth-observing multispectral and hyperspectral imaging sensors are discussed. The most commonly used sensor performance metric is signal-to-noise ratio, from which additional noise equivalent quantities can be computed, including noise equivalent spectral radiance (NESR), noise equivalent delta reflectance ( NE Δ ρ ), noise equivalent delta emittance ( NE Δ ϵ ), and noise equivalent delta temperature ( NE Δ T ). For hyperspectral sensors, these metrics are typically calculated from an at-aperture radiance (typically generated by MODTRAN) that includes both target radiance and nontarget (atmosphere and background) radiance. Unfortunately, these calculations treat the entire at-aperture radiance as the desired signal, even when the target radiance is only a fraction of the total (such as when sensing through a long or optically dense atmospheric path). To overcome this limitation, an augmented set of metrics based on a contrast signal-to-noise ratio, including their noise equivalent counterparts (CNESR, CNE Δ ρ , CNE Δ ϵ , and CNE Δ T ), is developed. These contrast metrics better quantify sensor performance in an operational environment that includes remote sensing through the atmosphere.
© 2017 Society of Photo-Optical Instrumentation Engineers (SPIE)
John F. Silny, John F. Silny, Louis Zellinger, Louis Zellinger, } "Radiometric sensitivity contrast metrics for spectral remote sensors," Optical Engineering 56(8), 081807 (7 June 2017). https://doi.org/10.1117/1.OE.56.8.081807 . Submission: Received: 1 February 2017; Accepted: 11 May 2017
Received: 1 February 2017; Accepted: 11 May 2017; Published: 7 June 2017

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