climatekit: Unified Climate Indices for Temperature, Precipitation, and
Drought
Compute the standard suite of climate indices from daily
weather observations. Provides the canonical 'ETCCDI' 27 (Expert
Team on Climate Change Detection and Indices), the 'ET-SCI'
heatwave and cold-wave families plus the Excess Heat Factor of
Nairn and Fawcett (2013), and agroclimatic, drought, and
human-comfort families. Drought indices ('SPI', 'SPEI') accept a
choice of distribution (gamma or Pearson III for SPI; log-logistic
or generalised extreme value for SPEI). Reference
evapotranspiration is available via Hargreaves and the FAO-56
Penman-Monteith method (Allen et al. 1998). Percentile-based
indices support the Zhang (2005) in-base bootstrap. Daily inputs
are numeric vectors plus a 'Date' vector; outputs are tidy data
frames. Optional gridded support via 'terra' applies any index
over a 'SpatRaster' and reads 'netCDF' input. No external API
calls; pairs with data packages such as 'readnoaa'. References:
Alexander et al. (2006) <doi:10.1029/2005JD006290>; Zhang et al.
(2011) <doi:10.1002/wcc.147>; Zhang et al. (2005)
<doi:10.1175/JCLI3366.1>.
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