Abstract
Quantifying Geostationary Operational Environmental Satellite R-series (GOES-R) Advanced Baseline Imager (ABI) Channel (Ch) 2 low-light signal-to-noise ratio (SNR) is a core ABI postlaunch product test to validate prelaunch performance expectations of this parameter. For GOES-16, an SNR analysis has been performed to accomplish this goal using ABI Mode-3 MESO visible near-infrared (VNIR) channel L1b radiance product images taken every 30 s between 17:00 UTC and 17:15 UTC on May 23, 2017. Scene pixel data used in the analysis are first screened to ensure they meet the low-light criteria and to minimize scene temporal variability associated with meteorological evolution and geolocation uncertainty in highly inhomogeneous scenes. After such screening, image-to-image radiance time difference statistics are compiled and analyzed to estimate instrument SNR. Based on GOES-R ABI vendor prelaunch testing, minimum and mean expected ABI Ch 2 postlaunch SNR performance at 5% albedo was estimated to be 44.2 and 64.5, respectively. Meanwhile, the SNR computed in this analysis is found to be about 57 ± 8. Thus, low-light SNR for ABI Ch 2 is shown to meet minimum user expectations. The analysis for the other five GOES-16 ABI VNIR channels is also shown to contrast the SNR for these channels.
Highlights
The Geostationary Operational Environmental Satellite R-series (GOES-R) Mission Requirements Document (MRD;[1] GOES-R Series Program) captures National Oceanic and Atmospheric Administration’s (NOAA’s) consolidated L1b and L2+ meteorological satellite product suite accuracy, precision, and geographical coverage needs
During GOES-R development and acquisition, a suite of Advanced Baseline Imager (ABI) postlaunch product test (PLPT) activities was defined for the purpose of postlaunch product validation and assessment
GOES-16 ABI visible near-infrared (VNIR) channel signal-to-noise ratio (SNR) results are given for a PLPT MESO-1 and MESO-2 data acquisition centered at the Earth coordinates 8.975615°S and 76.91671°W, and taken between 17:00 and 17:15 UTC on May 23, 2017
Summary
The Geostationary Operational Environmental Satellite R-series (GOES-R) Mission Requirements Document (MRD;[1] GOES-R Series Program) captures National Oceanic and Atmospheric Administration’s (NOAA’s) consolidated L1b and L2+ meteorological satellite product suite accuracy, precision, and geographical coverage needs. Temporal SNR (SNRT): For all scene pixels, n 1⁄4 1 to N, that pass through radiance and spatial SNR (defined later) filtering threshold values for consecutive images at time t and t þ 1, ΔL1⁄2n 1⁄4 L1⁄2n; t þ 1 − L1⁄2n; t; EQ-TARGET;temp:intralink-;sec2;116;155. Quantization SNR: The maximum SNR resolvable at a given radiance level as a result of L1b product quantization into scaled integers before being packaged into the GOES Rebroadcast data stream In this paper, this is expressed as SNRQ EQ-TARGET;temp:intralink-;sec2;116;373. The detector samples used to determine the radiance value at a given pixel cannot be determined This method is not capable of estimating the SNR for individual ABI detectors
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