Detection of Rain/Cloud Pixels by Ka-band AltiKa Altimeter over the Tropical Region: Development of a Rain/Cloud Flag Algorithm and its Validation
A rain/cloud flagging algorithm for the AltiKa waveform is developed. For this purpose, Mean Power Count between 13 and 40 gates and absolute value of off-nadir angle of Altika waveform are utilized against the backdrop of Liquid Water Content (LWC) > 0.25 kg m −2 . It is observed that parameter...
Ausführliche Beschreibung
Gespeichert in:
| Autor*in: |
Roy, Partha [verfasserIn] |
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| Format: |
Artikel |
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| Sprache: |
Englisch |
| Erschienen: |
2015 |
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| Rechteinformationen: |
Nutzungsrecht: Copyright © Taylor & Francis Group, LLC 2015 |
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| Schlagwörter: |
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| Übergeordnetes Werk: |
Enthalten in: Marine geodesy - New York, NY [u.a.] : Taylor & Francis, 1977, 38(2015), Seite 86 |
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| Übergeordnetes Werk: |
volume:38 ; year:2015 ; pages:86 |
| Links: |
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| DOI / URN: |
10.1080/01490419.2015.1008158 |
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OLC1965582389 |
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| 245 | 1 | 0 | |a Detection of Rain/Cloud Pixels by Ka-band AltiKa Altimeter over the Tropical Region: Development of a Rain/Cloud Flag Algorithm and its Validation |
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| 520 | |a A rain/cloud flagging algorithm for the AltiKa waveform is developed. For this purpose, Mean Power Count between 13 and 40 gates and absolute value of off-nadir angle of Altika waveform are utilized against the backdrop of Liquid Water Content (LWC) > 0.25 kg m −2 . It is observed that parameter is also affected by strong low-level jet. During the validation phase at near simultaneous time scale with 3B42 rainfall over the Indian Ocean, Probability of Detection (POD) and False Alarm Ratio (FAR) of Flag 1 (for LWC > 0.25 kg m −2 ) are found to be 0.76 and 0.19, respectively. Similarly POD and FAR of Flag 0 (for LWC ≤ 0.25 kg m −2 ) are found to be 0.90 and 0.11, respectively. Over the tropics during March 2013 to February 2014, the developed algorithm has detected 6.88% of Flag 1, of which 4.41% are due to rain/cloud, and the remaining 2.48% of flags are primarily due to strong low-level jet. Overall correlation coefficient between occurrence of Flag 1 due to rain/cloud and 3B42 rainfall is found to be 0.76. The developed algorithm is reasonably robust for detecting rain/cloud pixels. | ||
| 540 | |a Nutzungsrecht: Copyright © Taylor & Francis Group, LLC 2015 | ||
| 650 | 4 | |a rain flag | |
| 650 | 4 | |a Keywords SARAL/AltiKa altimeter | |
| 650 | 4 | |a Ka-band | |
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| 700 | 1 | |a Sharma, Sanjay |4 oth | |
| 700 | 1 | |a Gairola, Rakesh Mohan |4 oth | |
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10.1080/01490419.2015.1008158 doi PQ20160617 (DE-627)OLC1965582389 (DE-599)GBVOLC1965582389 (PRQ)i1727-617a43f2af292e69cbd9d20090cf30fdcf91a7c1eef04c3cf568156df84b3eb10 (KEY)0046549620150000038000000086detectionofraincloudpixelsbykabandaltikaaltimetero DE-627 ger DE-627 rakwb eng 550 DNB 38.73 bkl 38.90 bkl 74.30 bkl Roy, Partha verfasserin aut Detection of Rain/Cloud Pixels by Ka-band AltiKa Altimeter over the Tropical Region: Development of a Rain/Cloud Flag Algorithm and its Validation 2015 Text txt rdacontent ohne Hilfsmittel zu benutzen n rdamedia Band nc rdacarrier A rain/cloud flagging algorithm for the AltiKa waveform is developed. For this purpose, Mean Power Count between 13 and 40 gates and absolute value of off-nadir angle of Altika waveform are utilized against the backdrop of Liquid Water Content (LWC) > 0.25 kg m −2 . It is observed that parameter is also affected by strong low-level jet. During the validation phase at near simultaneous time scale with 3B42 rainfall over the Indian Ocean, Probability of Detection (POD) and False Alarm Ratio (FAR) of Flag 1 (for LWC > 0.25 kg m −2 ) are found to be 0.76 and 0.19, respectively. Similarly POD and FAR of Flag 0 (for LWC ≤ 0.25 kg m −2 ) are found to be 0.90 and 0.11, respectively. Over the tropics during March 2013 to February 2014, the developed algorithm has detected 6.88% of Flag 1, of which 4.41% are due to rain/cloud, and the remaining 2.48% of flags are primarily due to strong low-level jet. Overall correlation coefficient between occurrence of Flag 1 due to rain/cloud and 3B42 rainfall is found to be 0.76. The developed algorithm is reasonably robust for detecting rain/cloud pixels. Nutzungsrecht: Copyright © Taylor & Francis Group, LLC 2015 rain flag Keywords SARAL/AltiKa altimeter Ka-band tropical ocean backscattering by rain Algorithms Geodetics Correlation analysis Rain Sharma, Sanjay oth Gairola, Rakesh Mohan oth Enthalten in Marine geodesy New York, NY [u.a.] : Taylor & Francis, 1977 38(2015), Seite 86 (DE-627)130045721 (DE-600)432104-2 (DE-576)015585204 0149-0419 nnns volume:38 year:2015 pages:86 http://dx.doi.org/10.1080/01490419.2015.1008158 Volltext http://www.tandfonline.com/doi/abs/10.1080/01490419.2015.1008158 http://search.proquest.com/docview/1724506056 GBV_USEFLAG_A SYSFLAG_A GBV_OLC SSG-OLC-GEO GBV_ILN_11 GBV_ILN_70 GBV_ILN_601 38.73 AVZ 38.90 AVZ 74.30 AVZ AR 38 2015 86 |
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10.1080/01490419.2015.1008158 doi PQ20160617 (DE-627)OLC1965582389 (DE-599)GBVOLC1965582389 (PRQ)i1727-617a43f2af292e69cbd9d20090cf30fdcf91a7c1eef04c3cf568156df84b3eb10 (KEY)0046549620150000038000000086detectionofraincloudpixelsbykabandaltikaaltimetero DE-627 ger DE-627 rakwb eng 550 DNB 38.73 bkl 38.90 bkl 74.30 bkl Roy, Partha verfasserin aut Detection of Rain/Cloud Pixels by Ka-band AltiKa Altimeter over the Tropical Region: Development of a Rain/Cloud Flag Algorithm and its Validation 2015 Text txt rdacontent ohne Hilfsmittel zu benutzen n rdamedia Band nc rdacarrier A rain/cloud flagging algorithm for the AltiKa waveform is developed. For this purpose, Mean Power Count between 13 and 40 gates and absolute value of off-nadir angle of Altika waveform are utilized against the backdrop of Liquid Water Content (LWC) > 0.25 kg m −2 . It is observed that parameter is also affected by strong low-level jet. During the validation phase at near simultaneous time scale with 3B42 rainfall over the Indian Ocean, Probability of Detection (POD) and False Alarm Ratio (FAR) of Flag 1 (for LWC > 0.25 kg m −2 ) are found to be 0.76 and 0.19, respectively. Similarly POD and FAR of Flag 0 (for LWC ≤ 0.25 kg m −2 ) are found to be 0.90 and 0.11, respectively. Over the tropics during March 2013 to February 2014, the developed algorithm has detected 6.88% of Flag 1, of which 4.41% are due to rain/cloud, and the remaining 2.48% of flags are primarily due to strong low-level jet. Overall correlation coefficient between occurrence of Flag 1 due to rain/cloud and 3B42 rainfall is found to be 0.76. The developed algorithm is reasonably robust for detecting rain/cloud pixels. Nutzungsrecht: Copyright © Taylor & Francis Group, LLC 2015 rain flag Keywords SARAL/AltiKa altimeter Ka-band tropical ocean backscattering by rain Algorithms Geodetics Correlation analysis Rain Sharma, Sanjay oth Gairola, Rakesh Mohan oth Enthalten in Marine geodesy New York, NY [u.a.] : Taylor & Francis, 1977 38(2015), Seite 86 (DE-627)130045721 (DE-600)432104-2 (DE-576)015585204 0149-0419 nnns volume:38 year:2015 pages:86 http://dx.doi.org/10.1080/01490419.2015.1008158 Volltext http://www.tandfonline.com/doi/abs/10.1080/01490419.2015.1008158 http://search.proquest.com/docview/1724506056 GBV_USEFLAG_A SYSFLAG_A GBV_OLC SSG-OLC-GEO GBV_ILN_11 GBV_ILN_70 GBV_ILN_601 38.73 AVZ 38.90 AVZ 74.30 AVZ AR 38 2015 86 |
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10.1080/01490419.2015.1008158 doi PQ20160617 (DE-627)OLC1965582389 (DE-599)GBVOLC1965582389 (PRQ)i1727-617a43f2af292e69cbd9d20090cf30fdcf91a7c1eef04c3cf568156df84b3eb10 (KEY)0046549620150000038000000086detectionofraincloudpixelsbykabandaltikaaltimetero DE-627 ger DE-627 rakwb eng 550 DNB 38.73 bkl 38.90 bkl 74.30 bkl Roy, Partha verfasserin aut Detection of Rain/Cloud Pixels by Ka-band AltiKa Altimeter over the Tropical Region: Development of a Rain/Cloud Flag Algorithm and its Validation 2015 Text txt rdacontent ohne Hilfsmittel zu benutzen n rdamedia Band nc rdacarrier A rain/cloud flagging algorithm for the AltiKa waveform is developed. For this purpose, Mean Power Count between 13 and 40 gates and absolute value of off-nadir angle of Altika waveform are utilized against the backdrop of Liquid Water Content (LWC) > 0.25 kg m −2 . It is observed that parameter is also affected by strong low-level jet. During the validation phase at near simultaneous time scale with 3B42 rainfall over the Indian Ocean, Probability of Detection (POD) and False Alarm Ratio (FAR) of Flag 1 (for LWC > 0.25 kg m −2 ) are found to be 0.76 and 0.19, respectively. Similarly POD and FAR of Flag 0 (for LWC ≤ 0.25 kg m −2 ) are found to be 0.90 and 0.11, respectively. Over the tropics during March 2013 to February 2014, the developed algorithm has detected 6.88% of Flag 1, of which 4.41% are due to rain/cloud, and the remaining 2.48% of flags are primarily due to strong low-level jet. Overall correlation coefficient between occurrence of Flag 1 due to rain/cloud and 3B42 rainfall is found to be 0.76. The developed algorithm is reasonably robust for detecting rain/cloud pixels. Nutzungsrecht: Copyright © Taylor & Francis Group, LLC 2015 rain flag Keywords SARAL/AltiKa altimeter Ka-band tropical ocean backscattering by rain Algorithms Geodetics Correlation analysis Rain Sharma, Sanjay oth Gairola, Rakesh Mohan oth Enthalten in Marine geodesy New York, NY [u.a.] : Taylor & Francis, 1977 38(2015), Seite 86 (DE-627)130045721 (DE-600)432104-2 (DE-576)015585204 0149-0419 nnns volume:38 year:2015 pages:86 http://dx.doi.org/10.1080/01490419.2015.1008158 Volltext http://www.tandfonline.com/doi/abs/10.1080/01490419.2015.1008158 http://search.proquest.com/docview/1724506056 GBV_USEFLAG_A SYSFLAG_A GBV_OLC SSG-OLC-GEO GBV_ILN_11 GBV_ILN_70 GBV_ILN_601 38.73 AVZ 38.90 AVZ 74.30 AVZ AR 38 2015 86 |
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10.1080/01490419.2015.1008158 doi PQ20160617 (DE-627)OLC1965582389 (DE-599)GBVOLC1965582389 (PRQ)i1727-617a43f2af292e69cbd9d20090cf30fdcf91a7c1eef04c3cf568156df84b3eb10 (KEY)0046549620150000038000000086detectionofraincloudpixelsbykabandaltikaaltimetero DE-627 ger DE-627 rakwb eng 550 DNB 38.73 bkl 38.90 bkl 74.30 bkl Roy, Partha verfasserin aut Detection of Rain/Cloud Pixels by Ka-band AltiKa Altimeter over the Tropical Region: Development of a Rain/Cloud Flag Algorithm and its Validation 2015 Text txt rdacontent ohne Hilfsmittel zu benutzen n rdamedia Band nc rdacarrier A rain/cloud flagging algorithm for the AltiKa waveform is developed. For this purpose, Mean Power Count between 13 and 40 gates and absolute value of off-nadir angle of Altika waveform are utilized against the backdrop of Liquid Water Content (LWC) > 0.25 kg m −2 . It is observed that parameter is also affected by strong low-level jet. During the validation phase at near simultaneous time scale with 3B42 rainfall over the Indian Ocean, Probability of Detection (POD) and False Alarm Ratio (FAR) of Flag 1 (for LWC > 0.25 kg m −2 ) are found to be 0.76 and 0.19, respectively. Similarly POD and FAR of Flag 0 (for LWC ≤ 0.25 kg m −2 ) are found to be 0.90 and 0.11, respectively. Over the tropics during March 2013 to February 2014, the developed algorithm has detected 6.88% of Flag 1, of which 4.41% are due to rain/cloud, and the remaining 2.48% of flags are primarily due to strong low-level jet. Overall correlation coefficient between occurrence of Flag 1 due to rain/cloud and 3B42 rainfall is found to be 0.76. The developed algorithm is reasonably robust for detecting rain/cloud pixels. Nutzungsrecht: Copyright © Taylor & Francis Group, LLC 2015 rain flag Keywords SARAL/AltiKa altimeter Ka-band tropical ocean backscattering by rain Algorithms Geodetics Correlation analysis Rain Sharma, Sanjay oth Gairola, Rakesh Mohan oth Enthalten in Marine geodesy New York, NY [u.a.] : Taylor & Francis, 1977 38(2015), Seite 86 (DE-627)130045721 (DE-600)432104-2 (DE-576)015585204 0149-0419 nnns volume:38 year:2015 pages:86 http://dx.doi.org/10.1080/01490419.2015.1008158 Volltext http://www.tandfonline.com/doi/abs/10.1080/01490419.2015.1008158 http://search.proquest.com/docview/1724506056 GBV_USEFLAG_A SYSFLAG_A GBV_OLC SSG-OLC-GEO GBV_ILN_11 GBV_ILN_70 GBV_ILN_601 38.73 AVZ 38.90 AVZ 74.30 AVZ AR 38 2015 86 |
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Detection of Rain/Cloud Pixels by Ka-band AltiKa Altimeter over the Tropical Region: Development of a Rain/Cloud Flag Algorithm and its Validation |
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detection of rain/cloud pixels by ka-band altika altimeter over the tropical region: development of a rain/cloud flag algorithm and its validation |
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Detection of Rain/Cloud Pixels by Ka-band AltiKa Altimeter over the Tropical Region: Development of a Rain/Cloud Flag Algorithm and its Validation |
| abstract |
A rain/cloud flagging algorithm for the AltiKa waveform is developed. For this purpose, Mean Power Count between 13 and 40 gates and absolute value of off-nadir angle of Altika waveform are utilized against the backdrop of Liquid Water Content (LWC) > 0.25 kg m −2 . It is observed that parameter is also affected by strong low-level jet. During the validation phase at near simultaneous time scale with 3B42 rainfall over the Indian Ocean, Probability of Detection (POD) and False Alarm Ratio (FAR) of Flag 1 (for LWC > 0.25 kg m −2 ) are found to be 0.76 and 0.19, respectively. Similarly POD and FAR of Flag 0 (for LWC ≤ 0.25 kg m −2 ) are found to be 0.90 and 0.11, respectively. Over the tropics during March 2013 to February 2014, the developed algorithm has detected 6.88% of Flag 1, of which 4.41% are due to rain/cloud, and the remaining 2.48% of flags are primarily due to strong low-level jet. Overall correlation coefficient between occurrence of Flag 1 due to rain/cloud and 3B42 rainfall is found to be 0.76. The developed algorithm is reasonably robust for detecting rain/cloud pixels. |
| abstractGer |
A rain/cloud flagging algorithm for the AltiKa waveform is developed. For this purpose, Mean Power Count between 13 and 40 gates and absolute value of off-nadir angle of Altika waveform are utilized against the backdrop of Liquid Water Content (LWC) > 0.25 kg m −2 . It is observed that parameter is also affected by strong low-level jet. During the validation phase at near simultaneous time scale with 3B42 rainfall over the Indian Ocean, Probability of Detection (POD) and False Alarm Ratio (FAR) of Flag 1 (for LWC > 0.25 kg m −2 ) are found to be 0.76 and 0.19, respectively. Similarly POD and FAR of Flag 0 (for LWC ≤ 0.25 kg m −2 ) are found to be 0.90 and 0.11, respectively. Over the tropics during March 2013 to February 2014, the developed algorithm has detected 6.88% of Flag 1, of which 4.41% are due to rain/cloud, and the remaining 2.48% of flags are primarily due to strong low-level jet. Overall correlation coefficient between occurrence of Flag 1 due to rain/cloud and 3B42 rainfall is found to be 0.76. The developed algorithm is reasonably robust for detecting rain/cloud pixels. |
| abstract_unstemmed |
A rain/cloud flagging algorithm for the AltiKa waveform is developed. For this purpose, Mean Power Count between 13 and 40 gates and absolute value of off-nadir angle of Altika waveform are utilized against the backdrop of Liquid Water Content (LWC) > 0.25 kg m −2 . It is observed that parameter is also affected by strong low-level jet. During the validation phase at near simultaneous time scale with 3B42 rainfall over the Indian Ocean, Probability of Detection (POD) and False Alarm Ratio (FAR) of Flag 1 (for LWC > 0.25 kg m −2 ) are found to be 0.76 and 0.19, respectively. Similarly POD and FAR of Flag 0 (for LWC ≤ 0.25 kg m −2 ) are found to be 0.90 and 0.11, respectively. Over the tropics during March 2013 to February 2014, the developed algorithm has detected 6.88% of Flag 1, of which 4.41% are due to rain/cloud, and the remaining 2.48% of flags are primarily due to strong low-level jet. Overall correlation coefficient between occurrence of Flag 1 due to rain/cloud and 3B42 rainfall is found to be 0.76. The developed algorithm is reasonably robust for detecting rain/cloud pixels. |
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Detection of Rain/Cloud Pixels by Ka-band AltiKa Altimeter over the Tropical Region: Development of a Rain/Cloud Flag Algorithm and its Validation |
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