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| Research advances of SAR remote sensing for agriculture applications: A review |
LIU Chang-an1, CHEN Zhong-xin1, SHAO Yun2, CHEN Jin-song3, Tuya Hasi1, PAN Hai-zhu1 |
1 Key Laboratory of Agricultural Remote Sensing, Ministry of Agriculture/Institute of Agricultural Resources and Regional Planning, Chinese Academy of Agricultural Sciences, Beijing 100081, P.R.China
2 Institute of Remote Sensing and Digital Earth, Chinese Academy of Sciences, Beijing 100101, P.R.China
3 Laboratory of Remote Sensing Information Science, Shenzhen Institute of Advanced Technology, Chinese Academy of Sciences, Shenzhen 518055, P.R.China |
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Abstract Synthetic aperture radar (SAR) is an effective and important technique in monitoring crop and other agricultural targets because its quality does not depend on weather conditions. SAR is sensitive to the geometrical structures and dielectric properties of the targets and has a certain penetration ability to some agricultural targets. The capabilities of SAR for agriculture applications can be organized into three main categories: crop identification and crop planting area statistics, crop and cropland parameter extraction, and crop yield estimation. According to the above concepts, this paper systematically analyses the recent progresses, existing problems and future directions in SAR agricultural remote sensing. In recent years, with the remarkable progresses in SAR remote sensing systems, the available SAR data sources have been greatly enriched. The accuracies of the crop classification and parameter extraction by SAR data have been improved progressively. But the development of modern agriculture has put forwarded higher requirements for SAR remote sensing. For instance, the spatial resolution and revisiting cycle of the SAR sensors, the accuracy of crop classification, the whole phenological period monitoring of crop growth status, the soil moisture inversion under the condition of high vegetation coverage, the integrations of SAR remote sensing retrieval information with hydrological models and/or crop growth models, and so on, still need to be improved. In the future, the joint use of optical and SAR remote sensing data, the application of multi-band multi-dimensional SAR, the precise and high efficient modeling of electromagnetic scattering and parameter extraction of crop and farmland composite scene, the development of light and small SAR systems like those onboard unmanned aerial vehicles and their applications will be active research areas in agriculture remote sensing. This paper concludes that SAR remote sensing has great potential and will play a more significant role in the various fields of agricultural remote sensing.
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Received: 05 January 2018
Accepted:
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| Fund: This work was supported in part by the National Natural Science Foundation of China (61661136006 and 41371396). |
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Corresponding Authors:
Correspondence CHEN Zhong-xin, Tel: +86-10-82105089, E-mail: chenzhongxin@caas.cn
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| About author: LIU Chang-an, Mobile: +86-15510515768, E-mail: liuchangan@caas.cn; |
Cite this article:
LIU Chang-an, CHEN Zhong-xin, SHAO Yun, CHEN Jin-song, Tuya Hasi, PAN Hai-zhu.
2019.
Research advances of SAR remote sensing for agriculture applications: A review. Journal of Integrative Agriculture, 18(3): 506-525.
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