期刊
EUROPEAN JOURNAL OF REMOTE SENSING
卷 49, 期 -, 页码 57-72出版社
ASSOC ITALIANA TELERILEVAMENTO
DOI: 10.5721/EuJRS20164904
关键词
MODIS LAI product; improvement; autocorrelation
资金
- National Natural Science Foundation of China [31370637, 31500520]
- Natural Science Foundation of Zhejiang Province [LQ15C160003]
- Forestry Bureau of Anji County
A new method, based on pixel-to-pixel correlations, was proposed to replace unreliable Moderate Resolution Imaging Spectroradiometer (MODIS) leaf area index (LAI) time series (termed the pixel-to-pixel correction (PPC) method). MODIS LAI products improved by the PPC method were compared to field-measured LAI data. Results show that the PPC method could reduce the error associated with MODIS LAI products in relation to the original MODIS LAI product, and provide a level of accuracy that meets the most reliable quality control level criterion (quality control = 0). The PPC method performed well at correcting unrealistically high and unreliable LAI values, and performed slightly better than the upper envelope smoothing method. The corrected data were also more continuous and smoother than the raw MODIS LAI products. Thus, the PPC method can successfully reduce the uncertainty and improve the accuracy of raw MODIS LAI products.
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