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Published byRhoda Robbins Modified over 9 years ago
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DNB cloud mask test with CALIPSO over the W. coast area of S. America Cases: 20140812, 20140908, 20141108, 20141015 CLAVR-x generated Cloud Mask with VIIRS DNB on & off NLCOMP & ACHA (11/12 microns) comparisons CALIPSO Level2 1-km Cloud Layer (Layer Top & Base) and 5-km VFM (Vertical Feature Mask-Cloud) data CALIPSO cloud profiles with median and high confidence flags only S. Miller and Y. Noh at CIRA/CSU (23 March 2015)
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DNB and M15 (10.76 microns) VIIRS 0600-0621 UTC on 12 Aug 2014
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COT (NLCOMP and ACHA) VIIRS 0600-0621 UTC on 12 Aug 2014
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EPS (NLCOMP and ACHA) VIIRS 0600-0621 UTC on 12 Aug 2014
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Cloud Mask (DNB on and off) VIIRS 0600-0621 UTC on 12 Aug 2014 (Red line: CALIPSO)
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Cloud Mask Changes 12 Aug 2014 (16 granules) Each color represents cloud mask with IR only and the distributions along the x-axis show how the cloud mask changes with DNB (lunar refl on). Many ‘Probably clear’ and ‘Probably cloudy’ pixels from IR only are classified as ‘Cloudy’ with DNB on.
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CALIPSO-VIIRS cloud mask 12 Aug 2014 CALIPSO cloudy profiles (CL01) VIIRS cloudy pixels (DNB on) VIIRS cloudy pixels (DNB off) 568147554798 CALIPSO cloudy profiles (VFM) VIIRS cloudy pixels (DNB on) VIIRS cloudy pixels (DNB off) 1246965980 VIIRS granules: 060157-062317 UTC CALIOP profiles: 060943-062949 UTC Upper: Layer top & base altitudes from CALIPSO 1-km Cloud Layer product (cyan) and each closest VIIRS pixel’s Cloud Mask from clavr-x (red: DNB on, blue: DNB off-ACHA1) Bottom: Cloud typed from CALIPSO 5-km Vertical Feature Mask product
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12 Aug 2014
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DNB and M15 (10.76 microns) VIIRS 0554-0618 UTC on 08 Sep 2014
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COT (NLCOMP and ACHA) VIIRS 0554-0618 UTC on 08 Sep 2014
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EPS (NLCOMP and ACHA) VIIRS 0554-0618 UTC on 08 Sep 2014
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Cloud Mask (DNB on and off) VIIRS 0554-0618 UTC on 08 Sep 2014 (Red line: CALIPSO)
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Cloud Mask Changes 08 Sep 2014 (17 granules) Each color represents cloud mask with IR only and the distributions along the x-axis show how the cloud mask changes with DNB (lunar refl on). Many ‘Probably clear’ and ‘Probably cloudy’ pixels from IR only are classified as ‘Cloudy’ with DNB on.
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CALIPSO-VIIRS cloud mask 08 Sep 2014 CALIPSO cloudy profiles (CL01) VIIRS cloudy pixels (DNB on) VIIRS cloudy pixels (DNB off) 605151665223 CALIPSO cloudy profiles (VFM) VIIRS cloudy pixels (DNB on) VIIRS cloudy pixels (DNB off) 135610811088 VIIRS granules: 055602-061847 UTC CALIOP profiles: 055049-061141 UTC Upper: Layer top & base altitudes from CALIPSO 1-km Cloud Layer product (cyan) and each closest VIIRS pixel’s Cloud Mask from clavr-x (red: DNB on, blue: DNB off-ACHA1) Bottom: Cloud typed from CALIPSO 5-km Vertical Feature Mask product
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08 Sep 2014
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DNB and M15 (10.76 microns) VIIRS 0653-0715 UTC on 08 Nov 2014
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COT (NLCOMP and ACHA) VIIRS 0653-0715 UTC on 08 Nov 2014
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EPS (NLCOMP and ACHA) VIIRS 0653-0715 UTC on 08 Nov 2014
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Cloud Mask (DNB on and off) VIIRS 0653-0715 UTC on 08 Nov 2014 (Red line: CALIPSO)
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Cloud Mask Changes 08 Nov 2014 (13 granules) Each color represents cloud mask with IR only and the distributions along the x-axis show how the cloud mask changes with DNB (lunar refl on). Many ‘Probably clear’ and ‘Probably cloudy’ pixels from IR only are classified as ‘Cloudy’ with DNB on.
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CALIPSO-VIIRS cloud mask 08 Nov 2014 CALIPSO cloudy profiles (CL01) VIIRS cloudy pixels (DNB on) VIIRS cloudy pixels (DNB off) 630455755104 CALIPSO cloudy profiles (VFM) VIIRS cloudy pixels (DNB on) VIIRS cloudy pixels (DNB off) 130611271033 VIIRS granules: 065344-071213 UTC CALIOP profiles: 065901-071626 UTC Upper: Layer top & base altitudes from CALIPSO 1-km Cloud Layer product (cyan) and each closest VIIRS pixel’s Cloud Mask from clavr-x (red: DNB on, blue: DNB off-ACHA1) Bottom: Cloud typed from CALIPSO 5-km Vertical Feature Mask product
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08 Nov 2014
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DNB and M15 (10.76 microns) VIIRS 0604-0617 UTC on 15 Oct 2014 (3 rd quarter moon phase)
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COT (NLCOMP and ACHA) VIIRS 0604-0617 UTC on 15 Oct 2014 3 rd quarter moon phase partially with lunar zeniths over the threshold
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EPS (NLCOMP and ACHA) VIIRS 0604-0628 UTC on 15 Oct 2014 3 rd quarter moon phase partially with lunar zeniths over the threshold
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Cloud Mask (DNB on and off) VIIRS 0604-0617 UTC on 15 Oct 2014 (Red line: CALIPSO)
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Cloud Mask Changes 15 Oct 2014 (9 granules) Each color represents cloud mask with IR only and the distributions along the x-axis show how the cloud mask changes with DNB (lunar refl on). Many ‘Probably clear’ and ‘Probably cloudy’ pixels from IR only are classified as ‘Cloudy’ with DNB on.
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CALIPSO-VIIRS cloud mask 15 Oct 2014 (3 rd quarter moon phase) CALIPSO cloudy profiles (CL01) VIIRS cloudy pixels (DNB on) VIIRS cloudy pixels (DNB off) 407835583651 CALIPSO cloudy profiles (VFM) VIIRS cloudy pixels (DNB on) VIIRS cloudy pixels (DNB off) 858717731 VIIRS granules: 060419-061706 UTC CALIOP profiles: 060940-062209 UTC Upper: Layer top & base altitudes from CALIPSO 1-km Cloud Layer product (cyan) and each closest VIIRS pixel’s Cloud Mask from clavr-x (red: DNB on, blue: DNB off-ACHA1) Bottom: Cloud typed from CALIPSO 5-km Vertical Feature Mask product No lunar refl impact between -38 ~ -60 S
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15 Oct 2014 3 rd quarter moon phase partially with lunar zeniths over the threshold
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