Improved scheme for Cross-track Infrared Sounder geolocation assessment and optimization

Wang, Likun; Zhang, Bin; Tremblay, Denis; Han, Yong

doi:10.1002/2016jd025812

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Improved scheme for Cross-track Infrared Sounder geolocation assessment and optimization

2017
By Wang, Likun ; Zhang, Bin ; Tremblay, Denis ; ...
Source: JGR Atmospheres 122(1): 519-536

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Journal Title:

Journal of Geophysical Research: Atmospheres
Personal Author:

Wang, Likun ; Zhang, Bin ; Tremblay, Denis ; Han, Yong

Wang, Likun ; Zhang, Bin ; Tremblay, Denis ; Han, Yong Less -
NOAA Program & Office:

NESDIS (National Environmental Satellite, Data, and Information Service) ; STAR (Center for Satellite Applications and Research)

NESDIS (National Environmental Satellite, Data, and Information Service) ; STAR (Center for Satellite Applications and Research) Less -
Description:

An improved scheme for Cross-track Infrared Sounder (CrIS) geolocation assessment for all scan angles (from −48.5° to 48.5°) is developed in this study. The method uses spatially collocated radiance measurements from the Visible Infrared Imaging Radiometer Suite (VIIRS) image band I5 to evaluate the geolocation performance of the CrIS Sensor Data Records (SDR) by taking advantage of its high spatial resolution (375 m at nadir) and accurate geolocation. The basic idea is to perturb CrIS line-of-sight vectors along the in-track and cross-track directions to find a position where CrIS and VIIRS data matches more closely. The perturbation angles at this best matched position are then used to evaluate the CrIS geolocation accuracy. More importantly, the new method is capable of performing postlaunch on-orbit geometric calibration by optimizing mapping angle parameters based on the assessment results and thus can be further extended to the following CrIS sensors on new satellites. Finally, the proposed method is employed to evaluate the CrIS geolocation accuracy on current Suomi National Polar-orbiting Partnership satellite. The error characteristics are revealed along the scan positions in the in-track and cross-track directions. It is found that there are relatively large errors (~4 km) in the cross-track direction close to the end of scan positions. With newly updated mapping angles, the geolocation accuracy is greatly improved for all scan positions (less than 0.3 km). This makes CrIS and VIIRS spatially align together and thus benefits the application that needs combination of CrIS and VIIRS measurements and products.
Source:

JGR Atmospheres 122(1): 519-536
DOI:

https://doi.org/10.1002/2016jd025812
Document Type:

Journal Article
Funding:

Grant no. NA14NES4320003
Place as Subject:

Satellite interference geolocation technology
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Submitted
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urn:sha256:ca4345de0ed73cca26f485e4216d5c425cfda128d170c71946d7be11701b70dc
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https://staging-noaa.cdc.gov/view/noaa/43925/noaa_43925_DS1.pdf
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Improved scheme for Cross-track Infrared Sounder geolocation assessment and optimization

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