A daily gap-free normalized difference vegetation index dataset from 1981 to 2023 in China.

In contrast, the latitudinal average r between our dataset and other three datasets all show a decreasing trend with the decrease of latitude (Fig. 8g–i ).

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The proportion of valid data in the entire time series showed an increasing trend from the southeastern China to the northwestern China due to more frequent impacts of cloud and rain in the humid and semi-humid regions in China.

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