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. 2016 Oct 7;6:35105. doi: 10.1038/srep35105

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Copyright © 2016, The Author(s)

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Weight values of four copulas (left) (G, F, C, and N indicates Gumbel, Frank, Clayton, and Normal, respectively), joint CDF using the best-fitted copula (middle), and conditional CDF of NDVI under two precipitation scenarios: u_P ≤ 20% (blue solid curves) and u_P ≤ 60%(blue dashed curves), with the specific NDVI drought threshold () shown as red lines (right), for April–October (a–g).

Inline graphic — Weight values of four copulas (left) (G, F, C, and N indicates Gumbel, Frank, Clayton, and Normal, respectively), joint CDF using the best-fitted copula (middle), and conditional CDF of NDVI under two precipitation scenarios: u_P ≤ 20% (blue solid curves) and u_P ≤ 60%(blue dashed curves), with the specific NDVI drought threshold () shown as red lines (right), for April–October (a–g).