Google Earth Engine——干旱指数（KBDI）是一个连续的参考量表，用于估计土壤和煤层的干燥程度。该指数在没有下雨的每一天都会增加（增加的数量取决于每日的最高温度）
Keetch-Byram Drought Index (KBDI) is a continuous reference scale for estimating the dryness of the soil and duff layers. The index increases for each day without rain (the amount of increase depends on the daily high temperature) and decreases when
