Modeling and Reconstruction of Time Series of Passive Microwave Data by Discrete Fourier Transform Guided Filtering and Harmonic Analysis
文献类型：期刊论文
| 作者 | Shang, Haolu1; Jia, Li1; Menenti, Massimo1 |
| 刊名 | REMOTE SENSING
 |
| 出版日期 | 2016 |
| 卷号 | 8期号:11 |
| 关键词 | RADIATION-USE EFFICIENCY PHOTOSYNTHETICALLY ACTIVE RADIATION GROSS PRIMARY PRODUCTION LEAF-AREA INDEX NET PRIMARY PRODUCTION REMOTE-SENSING DATA MODIS DATA FUSION TEMPORAL RESOLUTION CROP CLASSIFICATION VEGETATION INDEXES |
| 通讯作者 | Jia, L ; Menenti, M (reprint author), Chinese Acad Sci, Inst Remote Sensing & Digital Earth, State Key Lab Remote Sensing Sci, Beijing 100101, Peoples R China. ; Menenti, M (reprint author), Delft Univ Technol, Fac Civil Engn & Geosci, NL-2600 GA Delft, Netherlands. ; Jia, L (reprint author), JCGCS, Beijing 100875, Peoples R China. |
| 英文摘要 | Daily time series of microwave radiometer data obtained in one-orbit direction are full of observation gaps due to satellite configuration and errors from spatial sampling. Such time series carry information about the surface signal including surface emittance and vegetation attenuation, and the atmospheric signal including atmosphere emittance and atmospheric attenuation. To extract the surface signal from this noisy time series, the Time Series Analysis Procedure (TSAP) was developed, based on the properties of the Discrete Fourier Transform (DFT). TSAP includes two stages: (1) identify the spectral features of observation gaps and errors and remove them with a modified boxcar filter; and (2) identify the spectral features of the surface signal and reconstruct it with the Harmonic Analysis of Time Series (HANTS) algorithm. Polarization Difference Brightness Temperature (PDBT) at 37 GHz data were used to illustrate the problems, to explain the implementation of TSAP and to validate this method, due to the PDBT sensitivity to the water content both at the land surface and in the atmosphere. We carried out a case study on a limited heterogeneous crop land and lake area, where the power spectrum of the PDBT time series showed that the harmonic components associated with observation gaps and errors have periods <= 8 days. After applying the modified boxcar filter with a length of 10 days, the RMSD between raw and filtered time series was above 11 K, mainly related to the power reduction in the frequency range associated with observation gaps and errors. Noise reduction is beneficial when applying PDBT observations to monitor wet areas and open water, since the PDBT range between dryland and open water is about 20 K. The spectral features of the atmospheric signal can be revealed by time series analysis of rain-gauge data, since the PDBT at 37 GHz is mainly attenuated by hydrometeors that yield precipitation. Thus, the spectral features of the surface signal were identified in the PDBT time series with the help of the rain-gauge data. HANTS reconstructed the upper envelope of the signal, i.e., correcting for atmospheric influence, while retaining the spectral features of the surface signal. To evaluate the impact of TSAP on retrieval accuracy, the fraction of Water Saturated Surface (WSS) in the region of Poyang Lake was retrieved with 37 GHz observations. The retrievals were evaluated against estimations of the lake area obtained with MODerate-resolution Imaging Spectroradiometer (MODIS) and Advanced Synthetic Aperture Radar (ASAR) data. The Relative RMSE on WSS was 39.5% with unfiltered data and 23% after applying TSAP, i.e., using the estimated surface signal only. |
| 学科主题 | Remote Sensing |
| 类目[WOS] | Remote Sensing |
| 收录类别 | SCI |
| 语种 | 英语 |
| WOS记录号 | WOS:000388798400090 |
| 源URL | [http://ir.radi.ac.cn/handle/183411/39232]  |
| 专题 | 遥感与数字地球研究所_SCI/EI期刊论文_期刊论文 |
| 作者单位 | 1.Chinese Acad Sci, Inst Remote Sensing & Digital Earth, State Key Lab Remote Sensing Sci, Beijing 100101, Peoples R China 2.Delft Univ Technol, Fac Civil Engn & Geosci, NL-2600 GA Delft, Netherlands 3.JCGCS, Beijing 100875, Peoples R China |
| 推荐引用方式 GB/T 7714 | Shang, Haolu,Jia, Li,Menenti, Massimo. Modeling and Reconstruction of Time Series of Passive Microwave Data by Discrete Fourier Transform Guided Filtering and Harmonic Analysis[J]. REMOTE SENSING,2016,8(11). |
| APA | Shang, Haolu,Jia, Li,&Menenti, Massimo.(2016).Modeling and Reconstruction of Time Series of Passive Microwave Data by Discrete Fourier Transform Guided Filtering and Harmonic Analysis.REMOTE SENSING,8(11). |
| MLA | Shang, Haolu,et al."Modeling and Reconstruction of Time Series of Passive Microwave Data by Discrete Fourier Transform Guided Filtering and Harmonic Analysis".REMOTE SENSING 8.11(2016). |
入库方式： OAI收割
来源：遥感与数字地球研究所
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