Academic Journal
Soil Moisture Retrieval Using CYGNSS Data in a Time-Series Ratio Method: Progress Update and Error Analysis, Part II
| العنوان: | Soil Moisture Retrieval Using CYGNSS Data in a Time-Series Ratio Method: Progress Update and Error Analysis, Part II |
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| المؤلفون: | Jeffrey D. Ouellette, Mohammad M. Al-Khaldi, Joel T. Johnson |
| المصدر: | IEEE Journal of Selected Topics in Applied Earth Observations and Remote Sensing, Vol 17, Pp 16426-16432 (2024) |
| بيانات النشر: | IEEE, 2024. |
| سنة النشر: | 2024 |
| المجموعة: | LCC:Ocean engineering LCC:Geophysics. Cosmic physics |
| مصطلحات موضوعية: | Bistatic radar, cyclone global navigation satellite system (CYGNSS) surface soil moisture (SSM), hydrology, passive radar, reflectivity, reflectometry, Ocean engineering, TC1501-1800, Geophysics. Cosmic physics, QC801-809 |
| الوصف: | This works reports updates to a previously-reported time-series ratio (TSR) algorithm for surface soil moisture retrieval from Cyclone Global Navigation Satellite System (CYGNSS) reflectivity data. Both the original and updated algorithms are based on ratios between consecutive, angle-corrected CYGNSS normalized radar cross section or reflectivity measurements, but the new algorithm implements a denoising approach, which involves the application of a fractional exponent term to these ratios. In addition, modifications have been made to several quality control parameters and to the bounds used in the algorithm's bounded linear least-squares solver. Error statistics for several variations of the TSR algorithm are reported using cross-validation with soil moisture retrievals from the soil moisture active passive sensor. The final results show that the updated algorithm produces similar retrieval errors to the previously reported approach, but increases the data retained in the retrieval so that coverage is improved. |
| نوع الوثيقة: | article |
| وصف الملف: | electronic resource |
| اللغة: | English |
| تدمد: | 1939-1404 2151-1535 |
| Relation: | https://ieeexplore.ieee.org/document/10570316/; https://doaj.org/toc/1939-1404; https://doaj.org/toc/2151-1535 |
| DOI: | 10.1109/JSTARS.2024.3418711 |
| URL الوصول: | https://doaj.org/article/ab38385e367f4405ae5479bfbdc96134 |
| رقم الانضمام: | edsdoj.b38385e367f4405ae5479bfbdc96134 |
| قاعدة البيانات: | Directory of Open Access Journals |
| تدمد: | 19391404 21511535 |
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| DOI: | 10.1109/JSTARS.2024.3418711 |