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Destriping VIIRS visible bands (preliminary results)

Destriping VIIRS visible bands (preliminary results). Karlis Mikelsons Ocean Color Group Meeting May 30, 2014. Different kinds of striping. Minor d ifferences in detector calibration and sensitivity Small amplitude No direct relation with detector number Affects all bands

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Destriping VIIRS visible bands (preliminary results)

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  1. Destriping VIIRS visible bands(preliminary results) KarlisMikelsons Ocean Color Group Meeting May 30, 2014

  2. Different kinds of striping • Minor differences in detector calibration and sensitivity • Small amplitude • No direct relation with detector number • Affects all bands [M. Bouali, J. Atm. & Oc. Tech.31, 150] • Differences among detector azimuthal and zenith angles • Linear dependence on detector • Very strong near glint areas • Affects reflective bands [Q. Liu, J. Atm. & Oc. Tech. 30, 2478] • Differences in sensor mirror side (MODIS) • Alternating values for even – odd scans • Nearly same offset for all pixels within one scan • Most pronounced in MODIS blue bands A: VIIRS, nLw(672) C: MODIS, nLw(412) B: VIIRS, nLw(412)

  3. Results: nLw (412nm) [original data]

  4. Results: nLw (412nm) [destriped]

  5. Results: nLw (445nm)[original data]

  6. Results: nLw (445nm)[destriped]

  7. Results: nLw (488nm)[original data]

  8. Results: nLw (488nm) [destriped]

  9. Results: nLw (555nm)[original data]

  10. Results: nLw (555nm) [destriped]

  11. Results: nLw (672nm)[original data]

  12. Results: nLw (672nm) [destriped]

  13. Results: nLw (746nm)[original data]

  14. Results: nLw (746nm) [destriped]

  15. Results: nLw (865nm)[original data]

  16. Results: nLw (865nm) [destriped]

  17. Summary • Existing destriping algorithm still mostly works for larger amplitude saw-like striping in reflective bands • Saw-like striping in bow tie area may not be completely removed (striping might be reintroduced after remapping of coordinates) • Striping affects deletions of nLw data in 746 & 865 nm bands Things to do: • Adjust destriping parameters to optimal values • Test more examples in different conditions • Explore possibility of destriping of L1b reflectances directly • Destripe MODIS visible bands

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