Evaluation of FY-3E/HIRAS-II Radiometric Calibration Accuracy Based on OMB Analysis
Before infrared hyperspectral data are used in satellite data assimilation systems or retrieval systems, the quantitative analysis of data deviation is necessary. Based on RTTOV’s (Radiative Transfer for TOVS) simulation data of FY-3E/HIRAS-II (Hyperspectral Infrared Atmospheric Sounder) and the obs...
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| Format: | Article |
| Language: | English |
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MDPI AG
2022-07-01
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| Series: | Remote Sensing |
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| Online Access: | https://www.mdpi.com/2072-4292/14/13/3222 |
| _version_ | 1797442036606959616 |
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| author | Chunming Zhang Chengli Qi Tianhang Yang Mingjian Gu Panxiang Zhang Lu Lee Mengzhen Xie Xiuqing Hu |
| author_facet | Chunming Zhang Chengli Qi Tianhang Yang Mingjian Gu Panxiang Zhang Lu Lee Mengzhen Xie Xiuqing Hu |
| author_sort | Chunming Zhang |
| collection | DOAJ |
| description | Before infrared hyperspectral data are used in satellite data assimilation systems or retrieval systems, the quantitative analysis of data deviation is necessary. Based on RTTOV’s (Radiative Transfer for TOVS) simulation data of FY-3E/HIRAS-II (Hyperspectral Infrared Atmospheric Sounder) and the observation data of HIRAS-II, we counted the bias of observation minus simulation (OMB) during an on-orbit test; analyzed the characteristics and reasons for the bias from the perspective of the FOV (field of view), the scanning angle of the instrument, the day and night, and the target temperature change; and analyzed the stability of the radiometric calibration accuracy. We also combined the results of the MetOp-C/IASI (infrared atmospheric sounding interferometer), a similar high-precision instrument, with the bias of OMB to compare and evaluate the FY-3E/HIRAS-II radiometric calibration accuracy. In the end, we found that the mean OMB bias of the long-wave and medium-wave infrared bands is within ±2 K, and the bias standard deviation is better than 2 K; the bias of each FOV is consistent and the bias of most channels is better than 2 K. The OMB bias of each channel is consistent with the changes in the angle of the instrument. The bias trend of long-wave and medium-wave infrared channels is more consistent with the deviation of the day and night; the bias of the short-wave infrared channel at night is lower than in the daytime. When counting the bias as the target temperature changed, the results showed that there are no obvious temperature dependencies in the long-wave and medium-wave infrared channels. This reflects that the instrument’s non-linear effect is well ordered. We further evaluated the stability of the radiometric calibration accuracy through statistics from the OMB standard deviation of each channel of FY-3E/HIRAS-II. Most channel accuracy stability values were better than 0.1 K. We calculated that IASI and HIRAS-II OMB have double differences, and the results show that the double difference in most channels is better than 1 K. It shows that the HIRAS-II and IASI observations are highly consistent. Through the statistics of the OMB bias during the on-orbit test period of FY-3E/HIRAS-II, we fully evaluated its radiometric calibration accuracy and laid the foundation for FY-3E/HIRAS-II data to be used in the retrieval application and assimilation system. |
| first_indexed | 2024-03-09T12:35:40Z |
| format | Article |
| id | doaj.art-2cb6c54846b0439cb5c2032fba6931c0 |
| institution | Directory Open Access Journal |
| issn | 2072-4292 |
| language | English |
| last_indexed | 2024-03-09T12:35:40Z |
| publishDate | 2022-07-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Remote Sensing |
| spelling | doaj.art-2cb6c54846b0439cb5c2032fba6931c02023-11-30T22:23:58ZengMDPI AGRemote Sensing2072-42922022-07-011413322210.3390/rs14133222Evaluation of FY-3E/HIRAS-II Radiometric Calibration Accuracy Based on OMB AnalysisChunming Zhang0Chengli Qi1Tianhang Yang2Mingjian Gu3Panxiang Zhang4Lu Lee5Mengzhen Xie6Xiuqing Hu7Key Laboratory of Infrared System Detection and Imaging Technologies, Shanghai Institute of Technical Physics, Chinese Academy of Sciences, Shanghai 200083, ChinaNational Satellite Meteorological Center, China Meteorological Administration, Beijing 100081, ChinaKey Laboratory of Infrared System Detection and Imaging Technologies, Shanghai Institute of Technical Physics, Chinese Academy of Sciences, Shanghai 200083, ChinaKey Laboratory of Infrared System Detection and Imaging Technologies, Shanghai Institute of Technical Physics, Chinese Academy of Sciences, Shanghai 200083, ChinaNational Satellite Meteorological Center, China Meteorological Administration, Beijing 100081, ChinaNational Satellite Meteorological Center, China Meteorological Administration, Beijing 100081, ChinaKey Laboratory of Infrared System Detection and Imaging Technologies, Shanghai Institute of Technical Physics, Chinese Academy of Sciences, Shanghai 200083, ChinaNational Satellite Meteorological Center, China Meteorological Administration, Beijing 100081, ChinaBefore infrared hyperspectral data are used in satellite data assimilation systems or retrieval systems, the quantitative analysis of data deviation is necessary. Based on RTTOV’s (Radiative Transfer for TOVS) simulation data of FY-3E/HIRAS-II (Hyperspectral Infrared Atmospheric Sounder) and the observation data of HIRAS-II, we counted the bias of observation minus simulation (OMB) during an on-orbit test; analyzed the characteristics and reasons for the bias from the perspective of the FOV (field of view), the scanning angle of the instrument, the day and night, and the target temperature change; and analyzed the stability of the radiometric calibration accuracy. We also combined the results of the MetOp-C/IASI (infrared atmospheric sounding interferometer), a similar high-precision instrument, with the bias of OMB to compare and evaluate the FY-3E/HIRAS-II radiometric calibration accuracy. In the end, we found that the mean OMB bias of the long-wave and medium-wave infrared bands is within ±2 K, and the bias standard deviation is better than 2 K; the bias of each FOV is consistent and the bias of most channels is better than 2 K. The OMB bias of each channel is consistent with the changes in the angle of the instrument. The bias trend of long-wave and medium-wave infrared channels is more consistent with the deviation of the day and night; the bias of the short-wave infrared channel at night is lower than in the daytime. When counting the bias as the target temperature changed, the results showed that there are no obvious temperature dependencies in the long-wave and medium-wave infrared channels. This reflects that the instrument’s non-linear effect is well ordered. We further evaluated the stability of the radiometric calibration accuracy through statistics from the OMB standard deviation of each channel of FY-3E/HIRAS-II. Most channel accuracy stability values were better than 0.1 K. We calculated that IASI and HIRAS-II OMB have double differences, and the results show that the double difference in most channels is better than 1 K. It shows that the HIRAS-II and IASI observations are highly consistent. Through the statistics of the OMB bias during the on-orbit test period of FY-3E/HIRAS-II, we fully evaluated its radiometric calibration accuracy and laid the foundation for FY-3E/HIRAS-II data to be used in the retrieval application and assimilation system.https://www.mdpi.com/2072-4292/14/13/3222FY-3E/HIRAS-IIOMBradiometric calibration accuracyRTTOV |
| spellingShingle | Chunming Zhang Chengli Qi Tianhang Yang Mingjian Gu Panxiang Zhang Lu Lee Mengzhen Xie Xiuqing Hu Evaluation of FY-3E/HIRAS-II Radiometric Calibration Accuracy Based on OMB Analysis Remote Sensing FY-3E/HIRAS-II OMB radiometric calibration accuracy RTTOV |
| title | Evaluation of FY-3E/HIRAS-II Radiometric Calibration Accuracy Based on OMB Analysis |
| title_full | Evaluation of FY-3E/HIRAS-II Radiometric Calibration Accuracy Based on OMB Analysis |
| title_fullStr | Evaluation of FY-3E/HIRAS-II Radiometric Calibration Accuracy Based on OMB Analysis |
| title_full_unstemmed | Evaluation of FY-3E/HIRAS-II Radiometric Calibration Accuracy Based on OMB Analysis |
| title_short | Evaluation of FY-3E/HIRAS-II Radiometric Calibration Accuracy Based on OMB Analysis |
| title_sort | evaluation of fy 3e hiras ii radiometric calibration accuracy based on omb analysis |
| topic | FY-3E/HIRAS-II OMB radiometric calibration accuracy RTTOV |
| url | https://www.mdpi.com/2072-4292/14/13/3222 |
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