Impact of Changes in Minimum Reflectance on Cloud Discrimination
| العنوان: | Impact of Changes in Minimum Reflectance on Cloud Discrimination |
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| المؤلفون: | Ryosuke Nakamura, Kazutaka Murakami, Tsuneo Matsunaga, Akihide Kamei, Yoshito Sawada, Yu Oishi |
| المصدر: | Remote Sensing, Vol 10, Iss 5, p 693 (2018) SC30201810100001 NARO成果DBa OA CC BY Remote Sensing; Volume 10; Issue 5; Pages: 693 |
| بيانات النشر: | MDPI AG, 2018. |
| سنة النشر: | 2018 |
| مصطلحات موضوعية: | 010504 meteorology & atmospheric sciences, business.industry, Science, 0211 other engineering and technologies, Fourier transform spectrometers, CLAUDIA, Cloud computing, 02 engineering and technology, cloud discrimination, minimum reflectance, GOSAT-2, CAI-2, 01 natural sciences, Reflectivity, General Earth and Planetary Sciences, business, Image resolution, 021101 geological & geomatics engineering, 0105 earth and related environmental sciences, Remote sensing, Mathematics |
| الوصف: | Greenhouse Gases Observing SATellite-2 (GOSAT-2) will be launched in fiscal year 2018. GOSAT-2 will be equipped with two Earth-observing instruments: the Thermal and Near-infrared Sensor for carbon Observation Fourier Transform Spectrometer 2 (TANSO-FTS-2) and TANSO-Cloud and Aerosol Imager 2 (CAI-2). CAI-2 can be used to perform cloud discrimination in each band. The cloud discrimination algorithm uses minimum reflectance (Rmin) for comparisons with observed top-of-atmosphere reflectance. The creation of cloud-free Rmin requires 10 CAI or CAI-2 data. Thus, Rmin is created from CAI L1B data for a 30-day period in GOSAT, with a revisit time of 3 days. It is necessary to change the way in which 10 observations are chosen for GOSAT-2, which has a revisit time of 6 days. Additionally, Rmin processing for GOSAT CAI data was updated to version 02.00 in December 2016. Along with this change, the resolution of Rmin changed from 1/30° to 500 m. We examined the impact of changes in Rmin on cloud discrimination results using GOSAT CAI data. In particular, we performed comparisons of: (1) Rmin calculated using different methods to choose the 10 observations and (2) Rmin calculated using different generation procedures and spatial resolutions. The results were as follows: (1) The impact of using different methods to choose the 10 observations on cloud discrimination results was small, except for a few cases, e.g., snow-covered regions and sun-glint regions; (2) Cloud discrimination results using Rmin in version 02.00 were better than results obtained using Rmin in the previous version, apart from some special situations. The main causes of this were as follows: (1) The change of used band from band 2 to band 1 for Rmin calculation; (2) The change of spatial resolution of Rmin from 1/30° to 500-m. |
| وصف الملف: | application/pdf |
| تدمد: | 2072-4292 |
| URL الوصول: | https://explore.openaire.eu/search/publication?articleId=doi_dedup___::f871a56d1597470e608cbb70886b4c5f https://doi.org/10.3390/rs10050693 |
| حقوق: | OPEN |
| رقم الأكسشن: | edsair.doi.dedup.....f871a56d1597470e608cbb70886b4c5f |
| قاعدة البيانات: | OpenAIRE |
| تدمد: | 20724292 |
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