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Technical Issues on NOAA-19 Validation Jörg Ackermann, Fran ç ois Montagner, Roberto Bonsignori, Thomas Heinemann, Lars Fiedler. Technical Issues on NOAA-19 Validation. MHS Radiance Validation using SNO’s AVHRR/3 Geolocation Validation using Landmarks Metop-A HIRS/4 Validation using IASI

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Technical Issues on NOAA-19 Validation


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    1. Technical Issues on NOAA-19 Validation Jörg Ackermann, François Montagner, Roberto Bonsignori, Thomas Heinemann, Lars Fiedler

    2. Technical Issues on NOAA-19 Validation • MHS Radiance Validation using SNO’s • AVHRR/3 Geolocation Validation using Landmarks • Metop-A HIRS/4 Validation using IASI • Outlook

    3. MHS Radiance Validation Using SNO’s Metop-A Example of a Simultaneous Nadir Overpass (SNO) • MHS Channel 1 Brightness Temperatures from NOAA-19 and Metop-A • SNO on 4. April 2009, 11:16:04 UTC NOAA-19

    4. MHS Radiance Validation Using SNO’s 1. Restriction to co-located pixels (less than 5km distance) 2260 pixels left

    5. MHS Radiance Validation Using SNO’s 2. Restriction to similar viewing angles (less than 3 pixels with the same scanning angles) 245 pixels left

    6. MHS Radiance Validation Using SNO’s 3. Restriction to co-located near nadir views (pixels 35 to 56 only) 62 pixels left

    7. MHS Radiance Validation Using SNO’s 4. Restriction to coincident near nadir views (maximum time difference of 30 seconds) 40 pixels left Computation of brightness temperature differences

    8. MHS Radiance Validation Using SNO’s Brightness temperature differences between NOAA-18 and Metop-A for channels 2, 3, 4, and 5 Time of SNO:

    9. MHS Radiance Validation Using SNO’s Brightness temperature differences between NOAA-19 and Metop-A for channels 2, 3, 4, and 5 Time of SNO:

    10. MHS Radiance Validation Using SNO’s Brightness temperature differences for channel 1

    11. MHS Radiance Validation Using SNO’s Possible solutions for MHS Ch. 1 onboard NOAA-19 • Leave as is • Empirical correction using results of cross- validation with NOAA-18 and Metop-A MHS and AMSU • Use NOAA-18 and/or Metop-A antenna correction and space view correction • Others?

    12. AVHRR/3 Geolocation Validation Global distribution of the 587 landmarks

    13. AVHRR/3 Geolocation Validation • Comparison between the Reference • Window and the Actual Window Reference Window: Land Sea Mask derived from Actual Data Location with a High Resolution Coastline Data Base Actual Window: Land Sea Mask derived from Actual Measurement Data via the 4 Following Criteria: * NDVI * T(Ch#4)-T(Ch#5) * Reflectance(Ch#2) * T(Ch#4) Searching for the Best Correlation by Moving the Actual Window Relative to the Reference Window Parameters iwact=20 Pixels ixshift=8 Pixels iyshift=10 Pixels

    14. AVHRR/3 Geolocation Validation Example for Demo => Focus on actual binary images at different scan positions

    15. AVHRR/3 Geolocation Validation NOAA-19, 14. April 2008, ascending path, no correction N = 1858 N=1235 N=948 N=413 N=169 Δx = - 2 Δx = - 3Δx = - 1Δx = - 2Δx = - 1 Δy = +3 Δy = +2 Δy = +2 Δy = +1 Δy = - 1 r = 5.0 km r = 3.3 km r = 2.3 km r = 2.7 km r = 2.5 km

    16. AVHRR/3 Geolocation Validation NOAA-19, 14. April 2008, ascending path, roll: + 0.1 ° N = 1860 N=1237 N=950 N=415 N=171 Δx = 0 Δx = - 1Δx = 0 Δx = - 1Δx = - 1 Δy = +3 Δy = +2 Δy = +2 Δy = +1 Δy = - 1 r = 3.3 km r = 2.3 km r = 2.2 km r = 1.1 km r = 2.4 km

    17. AVHRR/3 Geolocation Validation NOAA-19, 14. April 2008, ascending path, yaw:+0.05°; pitch:-0.08°; roll: +0.1° N = 1860 N=1237 N=950 N=415 N=171 Δx = 0 Δx = - 1Δx = 0Δx = +1 Δx = +1 Δy = +1 Δy = +1 Δy = +1 Δy = +1 Δy = - 2 r = 1.1 km r = 1.4 km r = 1.1 km r = 1.3 km r = 3.0 km

    18. AVHRR/3 Geolocation Validation NOAA-19, 25. March 2008, descending path, yaw:+0.05°; pitch:-0.08°; roll: +0.1° N = 1699 N=1650 N=1223 Δx = - 3 Δx = - 3Δx = - 3 Δy = +5 Δy = +5 Δy = +5 r = 7.0 km r = 6.8 km r = 6.2 km

    19. Metop-A HIRS/4 vs. IASI Cross-Validation HIRS Mercury Cadmium Telluride (MCT) detector channels • HIRS Ch1 has high noise level • Small bias of HIRS surface channel 8 confirms validity of co-location • Average radiance differences are well within specifications of 0.5K Fiedler et al., 2009

    20. Metop-A HIRS/4 vs. IASI Cross-Validation HIRS Indium Antimonide (InSb) detector channels • HIRS Channel 15 has a skewed distribution of the radiance bias • Again all channels average radiance differences are well within specifications of 0.5K Fiedler et al., 2009