![Flash drought early warning based on the trajectory of solar-induced chlorophyll fluorescence | PNAS Flash drought early warning based on the trajectory of solar-induced chlorophyll fluorescence | PNAS](https://www.pnas.org/cms/10.1073/pnas.2202767119/asset/39082700-f9f0-4611-aa99-12124a494563/assets/images/large/pnas.2202767119fig01.jpg)
Flash drought early warning based on the trajectory of solar-induced chlorophyll fluorescence | PNAS
Calculation steps 1) Locate the exercise data in your PC (freely available from the U.S. Geological Survey: http://earthexplorer
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