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A spatiotemporal method for NDVI reconstruction based on differential smoothness
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DOI：10.1016/j.ecoinf.2026.103856.png)
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Abstract
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• The TGSR method is proposed to reconstruct low-quality MODIS NDVI data. • It leverages a graph structure to model spatiotemporal dependencies in NDVI data. • It enhances spatial smoothness of temporal differences instead of NDVI values. • It outperforms the SG filter and ST-Tensor methods in accuracy and robustness. • It achieves high accuracy with as little as 15% of reliable NDVI observations.
Keywords:
Differential smoothness
Graph signal reconstruction
NDVI
Noise
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