Fig. 2
From: Classification of drought severity in contiguous USA during the past 21 years using fractal geometry
Right up: Normalized Difference Vegetation Index (NDVI) Arizona versus time (2010–2021), Left up: Seasonal Land Surface Temperature (LST) Arizona versus time (2010–2021), Right down: the histogram of Normalized Difference Vegetation Index (NDVI) Arizona, Left down: the histogram of Seasonal Land Surface Temperature (LST) Arizona, https://developers.google.com/earth-engine/datasets/catalog; Google Earth Enterprise Open Source