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Chakraborty, Abhisek
- Post-Launch Calibration–Validation and Data Quality Evaluation of SCATSAT-1
Abstract Views :254 |
PDF Views:73
Authors
Raj Kumar
1,
Suchandra A. Bhowmick
1,
Abhisek Chakraborty
1,
Anuja Sharma
1,
Shweta Sharma
1,
M. Seemanth
1,
Maneesha Gupta
1,
Prantik Chakraborty
1,
Jalpa Modi
1,
Tapan Misra
1
Affiliations
1 Space Applications Centre, ISRO, Ahmedabad 380 015, IN
1 Space Applications Centre, ISRO, Ahmedabad 380 015, IN
Source
Current Science, Vol 117, No 6 (2019), Pagination: 973-982Abstract
Here we provide a brief description of the post-launch data quality evaluation and calibration–validation chain of the SCATSAT-1, the second scatterometers mission of Indian Space Research Organisation. This chain is of absolute importance to monitor the satellite health and its impact on its measurements. It also provides us overview of the suitability of the data for various applications. The results show that the SCATSAT instrument is having nominal behaviour, the measurements are of very high quality and is comparable to the reference mission QuikSCAT. The ocean surface winds derived using SCATSAT-1 are having errors less than 1 m/s and hence it is suitable for all operational meteorological and oceanographic applications.Keywords
Calibration, Data Quality Evaluation, Scatterometers, Validation, Wind Vectors.Full Text
References
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- Kumar, R., Chakraborty, A., Parekh, A., Sikhakolli, R., Gohil, B. S. and Kiran Kumar, A. S., Evaluation of Oceansat-2-derived ocean surface winds using observations from global buoys and other scatterometers. IEEE Trans. Geosci. Remote Sensing, 2013, 51(5), 2571–2576.
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- Development of Windspeed Retrieval Model using RISAT-1 SAR Cross-Polarized Observations
Abstract Views :164 |
PDF Views:84
Authors
Affiliations
1 Earth, Ocean, Atmosphere, Planetary Sciences and Applications Area, Space Applications Centre, Indian Space Research Organisation, Ahmedabad 380 015, IN
1 Earth, Ocean, Atmosphere, Planetary Sciences and Applications Area, Space Applications Centre, Indian Space Research Organisation, Ahmedabad 380 015, IN
Source
Current Science, Vol 118, No 8 (2020), Pagination: 1282-1286Abstract
In this study, a method for retrieving ocean surface wind speed using C-band cross-polarization SAR observations has been outlined. A linear least square technique has been used to develop a Geophysical Model Function (GMF), C2P. The GMF was derived using NRCS observations from RISAT-1 and wind-speed observations from ASCAT. The correlation between observed and simulated NRCS values obtained from C2P was 0.66, with a negative bias of 0.01 dB and the corresponding ischolar_main mean square difference of 1.13 dB. Subsequently, the developed GMF was tested with 774 RISAT-1 MRS datasets to retrieve wind speed along the Indian coast and also of the tropical cyclone ‘Megh’. The measured intensity and radius of maximum wind speed were 30 m s–1 and 16.65 km respectively. Subsequently, the retrieved wind speed was validated with ASCAT wind-speed observations. The statistical comparison of RISAT-1 and ASCAT observed wind speed showed negative biases of 0.90 and 0.34 m s–1 with the corresponding RMSD of 2.11 and 1.77 m s–1 respectively, for CMOD5.N and C2P. The developed GMF C2P showed 16% more accuracy than that of CMOD5.N.Keywords
Cross-polarization, Geophysical Model Function, Ocean Surface, Wind Speed Retrieval.Full Text
References
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- Jagdish, Kumar, S. V. V. A., Chakraborty, A. and Kumar, R., Validation of wind speed retrieval from RISAT-1 SAR images of the North Indian Ocean. Remote Sensing Lett., 2018, 9(5), 421– 428; doi:10.1080/2150704X.2018.1430392.