gridMET Drought

Datasets:

• gridMET Drought Indices

Description: The gridMET drought indices are computed using the daily gridMET dataset (which is a surface meteorological dataset based on PRISM and NLDAS-2). The drought indices computed are for the standardized indices of SPI, SPEI and EDDI and the Palmer Drought Severity Index (PDSI) and Palmer Z-Index. The methods used to compute these indices from gridMET are described here.

Organization: University of California Merced (UCM)

Website: gridMET Website

Google Earth Engine Catalog: catalog/GRIDMET_DROUGHT

Spatial resolution: 4-km grid (1/24-deg)

Time Span: 1979 to Present (updated every 5 days with a 4-9 day lag)

Variables:

• Palmer Drought Severity Index (PDSI)
• Palmer Z-Index (Z)
• Standardized Precipitation Index (SPI) (14,30,60,90,180-day, 1,2,5-year)
• Standardized Precipitation Evapotranspiration Index (SPEI) (14,30,60,90,180-day, 1,2,5-year)
• Evaporative Demand Drought Index (EDDI) (14,30,60,90,180-day, 1,2,5-year)
• Short and Long Term Drought Blends (Computed by Climate Engine) 

Terms of Use:

• CC BY 4.0

References:

• Abatzoglou J. T. "Development of gridded surface meteorological data for ecological applications and modelling". International Journal of Climatology. (2011) doi: 10.1002/joc.3413.(Abstract)