A platform for research: civil engineering, architecture and urbanism
A platform for research: civil engineering, architecture and urbanism
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 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.
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 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.
Detection of Rain/Cloud Pixels by Ka-band AltiKa Altimeter over the Tropical Region: Development of a Rain/Cloud Flag Algorithm and its Validation
Roy, Partha (author) / Sharma, Sanjay / Gairola, Rakesh Mohan
Marine geodesy ; 38
2015
Article (Journal)
English
Validation of AltiKa Matching Pursuit Rain Flag
| Online Contents | 2015
Sea Ice Leads Detection Using SARAL/AltiKa Altimeter
| Online Contents | 2015
AltiKa Altimeter: Instrument Description and In Flight Performance
| Online Contents | 2015