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X. Yin and J. Boutin

Sun correction Statistics of TB in the FOV. X. Yin and J. Boutin Thanks P. Spurgeon, A. Chuprin, R. Balague and R. Castro for providing L1 V500 data. When reflected Sun appears in the FOV. Sun on. Sun off. On - off. X pol. 10. 1. 10.

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X. Yin and J. Boutin

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  1. Sun correction Statistics of TB in the FOV X. Yin and J. Boutin Thanks P. Spurgeon, A. Chuprin, R. Balague and R. Castro for providing L1 V500 data

  2. When reflected Sun appears in the FOV

  3. Sun on Sun off On - off X pol 10 1 10 Vertical stripes appear in differences of the two OTT, but not very clear in differences of std of TB in the FOV. OTT -10 -1 -10 0.2 5 5 Standard deviation of differences between measured and modelled TB Negative tails are due to no Sun correction. -0.2 0 0 0.2 1.5 1.5 Ratios of measurement to expected radiometric accuracy -0.2 0.5 0.5

  4. Sun on Sun off On - off Y pol 10 10 1 OTT -10 -10 -1 5 5 0.2 Standard deviation of differences between measured and modelled TB 0 0 -0.2 1.5 1.5 0.2 Ratios of measurement to expected radiometric accuracy -0.2 0.5 0.5

  5. X pol Y pol 1 20100704T1246 1. Stable pattern of vertical stripes. 2. Tails are noticeable, because of no Sun correction. -1 1 20100704T1426 -1 1 20100719T1303 -1

  6. OTT differences 20100704T1246 X pol Y pol 1 1 20100704T1426 -1 -1 Variations of vertical stripes is very small compared with differences in the OTT. 1 1 20100719T1303 -1 -1

  7. When reflected Sun doesn’t appear in the FOV

  8. X pol Sun on Sun off On - off 0.2 Very flat, no tails at all 10 10 OTT -0.2 -10 -10 0.2 5 5 Standard deviation of differences between measured and modelled TB -0.2 0 0 0.2 1.5 1.5 Ratios of measurement to expected radiometric accuracy -0.2 0.5 0.5

  9. November Sun on When reflected Sun appears in the FOV

  10. mixed snapshots X pol Pure snapshots 10 10 OTT -10 -10 5 5 Standard deviation of differences between measured and modelled TB 0 0 1.5 1.5 Ratios of measurement to expected radiometric accuracy Tails? 0.5 0.5

  11. mixed snapshots Y pol Pure snapshots 10 10 OTT -10 -10 5 5 Standard deviation of differences between measured and modelled TB 0 0 1.5 1.5 Ratios of measurement to expected radiometric accuracy 0.5 0.5

  12. Conclusions 1. Vertical stripes appear in OTT(Sun on) - OTT(Sun off), but are not very clear in differences of std of TB in the FOV. 2. Thepattern of vertical stripes is stable. 3. Variations of vertical stripes are very small compared with differences in the OTT. 4. Good Sun correction should be on to avoid tails far away from Sun point. Future More descending orbits in November are needed to check the tails in the FOV of pure snapshots of X pol.

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