Empirical mode decomposition and wavelet analysis of time-series spot data for evaluating rice planting calendar

C. F. Chen, S. W. Huang, L. Y. Chang, N. T. Son, C. R. Chen

研究成果: 書貢獻/報告類型會議論文篇章同行評審

摘要

Time series of optical satellite data acquired from low-to-medium resolution satellite sensors have been proven as an important source of information for monitoring agricultural practices at the regional scale due to its wide coverage and high frequency of revisit on a regular basis. However, the mixed pixel problem usually effects the spectral characteristics of satellite imagery when applied for a sub-national scale. The objective of this study is to assess the rice planting calendar in Taiwan using SPOT data (acquired on an irregular basis).The data processing consists of three main procedures: (i) constructing time-series SPOT NDVI data; (ii) filtering time-series NDVI data by empirical mode decomposition (EMD) and wavelet transform; and (iii) detecting rice planting date from smooth time-series NDVI profile by using the local minimum method. As for the filtering with EMD, we used the EMD-based low-pass filter, which is designed based on the analysis of initial EMD-sifting results. In wavelet analysis, three types of mother wavelet (Coiflet 4, Symlet 6,Daubechies 13) were used. The results validated with the government rice planting statistics indicate that the case of using EMD-based filtered data for determination of rice planting date gave remarkably good results in comparison with other cases using wavelet transform. We thus proposed this EMD-based filtering method for noise reduction of time-series vegetation index of satellite data acquired at different time intervals for evaluating rice agricultural practices.

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主出版物標題31st Asian Conference on Remote Sensing 2010, ACRS 2010
頁面1661-1666
頁數6
出版狀態已出版 - 2010
事件31st Asian Conference on Remote Sensing 2010, ACRS 2010 - Hanoi, Viet Nam
持續時間: 1 11月 20105 11月 2010

出版系列

名字31st Asian Conference on Remote Sensing 2010, ACRS 2010
2

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???event.eventtypes.event.conference???31st Asian Conference on Remote Sensing 2010, ACRS 2010
國家/地區Viet Nam
城市Hanoi
期間1/11/105/11/10

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