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Download and process Global Aridity Index and Potential Evapotranspiration (ET0)

Source: R/aridity.R
aridity.Rd

This function downloads, processes, and extracts variables from the Global Aridity Index and ET0 Database v3. Each variable corresponds to a global raster representing aridity index or potential evapotranspiration values.

Usage

aridity(x, vars, ...)

Arguments

x

The output from `par_set()` defining the area or locations for extraction, the reference system, and the buffer. Leave this empty and use `par_set()` to define parameters for download.

vars

Character vector of one or more variables to download and process.

...

Additional arguments (currently unused).

Value

If `par_set()` contained a raster/polygon/points with buffer: a `SpatRaster` stack of processed variables. If `par_set()` contained spatial points or data.frame of points without buffer: a `data.frame` of x, y, and extracted values.

Details

Available variables (working synonyms in parentheses):

Annual Variables

  • "ai_v3_yr.tif" ("aridity index annual", "ai annual", "aridity annual", "ai year")

  • "et0_v3_yr.tif" ("et0 annual", "potential evapotranspiration annual", "et0 year")

  • "et0_v3_yr_sd.tif" ("et0 standard deviation", "et0 sd", "et0 variability")

Monthly Aridity Index

  • "ai_v3_01.tif" ... "ai_v3_12.tif" ("aridity index january"..."december", "ai jan"..."dec", "ai 01"..."12")

Monthly Potential Evapotranspiration (ET0)

  • "et0_v3_01.tif" ... "et0_v3_12.tif" ("et0 january"..."december", "et0 jan"..."dec", "et0 01"..."12")

Citation:
Zomer RJ, Xu J, Trabucco A (2022). "Version 3 of the Global Aridity Index and Potential Evapotranspiration Database." Scientific Data 9, 409. https://doi.org/10.1038/s41597-022-01493-1

Note: Data is downloaded from Figshare (Article ID 7504448).

Examples

# \donttest{
processed <- par_set(country= "Italy", crs=3035) %>% 
aridity(vars=c("aridity index annual", "et0 january"))
  # }