Retrieval of rice phenological stages based on time-series full-polarization synthetic aperture radar data
Rice species identification and the retrieval of key phenological stages were processed in the area around Jinhu County, Huai’an City, Jiangsu Province, based on multi-temporal full-polarization synthetic aperture radar (SAR) data. By extracting and analyzing the change characteristics of the time-s...
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Zhejiang University Press
2021-06-01
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| Series: | 浙江大学学报. 农业与生命科学版 |
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| Online Access: | https://www.academax.com/doi/10.3785/j.issn.1008-9209.2020.09.231 |
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| author | LI Hongyu LI Kun YANG Zhi |
| author_facet | LI Hongyu LI Kun YANG Zhi |
| author_sort | LI Hongyu |
| collection | DOAJ |
| description | Rice species identification and the retrieval of key phenological stages were processed in the area around Jinhu County, Huai’an City, Jiangsu Province, based on multi-temporal full-polarization synthetic aperture radar (SAR) data. By extracting and analyzing the change characteristics of the time-series curve of the polarization characteristic parameters of rice, the polarization characteristic parameters that are sensitive to the changes of rice phenology were screened out, and a radar phenology index (RPI) that can reflect the key phenological changes of rice growth was constructed, and then was reconstructed by Savitzky-Golay (S-G) filter. The key phenological stages of rice were retrieved by the RPI. The results showed that the response of the polarization parameter Shannon entropy was quite different between japonica rice and indica rice, indicating that Shannon entropy could be used to identify indica rice and japonica rice with precisions of 92.38% and 95.10%, respectively; the curve derivative method was used to extract the characteristic points of the time-series RPI curve of rice, and three key phenological stages of rice were identified. The dates of the identified key phenological stages of rice were all within ±16 d from the date obtained in the field survey. The above results show that the use of RPI can more accurately retrieve the key phenological stages of rice. |
| format | Article |
| id | doaj-art-a1c29d4d188d484abce80f47ba9ea744 |
| institution | DOAJ |
| issn | 1008-9209 2097-5155 |
| language | English |
| publishDate | 2021-06-01 |
| publisher | Zhejiang University Press |
| record_format | Article |
| series | 浙江大学学报. 农业与生命科学版 |
| spelling | doaj-art-a1c29d4d188d484abce80f47ba9ea7442025-08-20T02:47:32ZengZhejiang University Press浙江大学学报. 农业与生命科学版1008-92092097-51552021-06-014740441410.3785/j.issn.1008-9209.2020.09.23110089209Retrieval of rice phenological stages based on time-series full-polarization synthetic aperture radar dataLI HongyuLI KunYANG ZhiRice species identification and the retrieval of key phenological stages were processed in the area around Jinhu County, Huai’an City, Jiangsu Province, based on multi-temporal full-polarization synthetic aperture radar (SAR) data. By extracting and analyzing the change characteristics of the time-series curve of the polarization characteristic parameters of rice, the polarization characteristic parameters that are sensitive to the changes of rice phenology were screened out, and a radar phenology index (RPI) that can reflect the key phenological changes of rice growth was constructed, and then was reconstructed by Savitzky-Golay (S-G) filter. The key phenological stages of rice were retrieved by the RPI. The results showed that the response of the polarization parameter Shannon entropy was quite different between japonica rice and indica rice, indicating that Shannon entropy could be used to identify indica rice and japonica rice with precisions of 92.38% and 95.10%, respectively; the curve derivative method was used to extract the characteristic points of the time-series RPI curve of rice, and three key phenological stages of rice were identified. The dates of the identified key phenological stages of rice were all within ±16 d from the date obtained in the field survey. The above results show that the use of RPI can more accurately retrieve the key phenological stages of rice.https://www.academax.com/doi/10.3785/j.issn.1008-9209.2020.09.231full-polarization synthetic aperture radarretrieval of rice phenologyradar phenology index |
| spellingShingle | LI Hongyu LI Kun YANG Zhi Retrieval of rice phenological stages based on time-series full-polarization synthetic aperture radar data 浙江大学学报. 农业与生命科学版 full-polarization synthetic aperture radar retrieval of rice phenology radar phenology index |
| title | Retrieval of rice phenological stages based on time-series full-polarization synthetic aperture radar data |
| title_full | Retrieval of rice phenological stages based on time-series full-polarization synthetic aperture radar data |
| title_fullStr | Retrieval of rice phenological stages based on time-series full-polarization synthetic aperture radar data |
| title_full_unstemmed | Retrieval of rice phenological stages based on time-series full-polarization synthetic aperture radar data |
| title_short | Retrieval of rice phenological stages based on time-series full-polarization synthetic aperture radar data |
| title_sort | retrieval of rice phenological stages based on time series full polarization synthetic aperture radar data |
| topic | full-polarization synthetic aperture radar retrieval of rice phenology radar phenology index |
| url | https://www.academax.com/doi/10.3785/j.issn.1008-9209.2020.09.231 |
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