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The wdiEF package provides tools to calculate the Water Deficit Index (WDI) and the Evaporative Fraction (EF) from raster data. It utilizes fractional vegetation cover (FVC) and surface-air temperature difference (TS-TA) to generate the WDI or EF raster.
You can install the development version of wdiEF directly from your local folder:
The input rasters (TS
and TA
) must have
the same unit of measurement (Kelvin preferably) to ensure accurate
calculations of TS-TA
and the Water Deficit Index (WDI) or
the Evaporative Fraction (EF).
The input rasters (FVC
and TS-TA
)
must:
If these conditions are not met, the function attempt to align the rasters automatically (with warnings).
The wdiEF
package automatically manages the following
dependencies: - terra
for raster manipulation. -
dplyr
for data manipulation. - stats
for
statistical calculations.
You do not need to load these packages manually; they are handled
internally by wdiEF
wdiEF
PackageTo use the wdiEF
package, start by loading the necessary
library in R.
Define the paths to the input files (FVC and TS-TA rasters) and the output path for the calculated WDI raster.
# Load the necessary package library(wdiEF)
# Input raster paths FVC_path <- “path/to/FVC.tif” TS_TA_path <- “path/to/TS_TA.tif”
# Output raster path output_path <- “path/to/WDI.tif”
# Calculate WDI calculate_WDI( FVC_path = FVC_path, TS_TA_path = TS_TA_path, output_path = output_path, n_intervals = 20, percentile = 0.01 )
# Check the output WDI <- terra::rast(output_path) plot(WDI)
Define the paths to the input files (FVC and TS-TA rasters) and the output path for the calculated EF raster.
# Load the necessary package library(wdiEF)
# Input raster paths FVC_path <- “path/to/FVC.tif” TS_TA_path <- “path/to/TS_TA.tif”
# Output raster path output_path <- “path/to/EF.tif”
# Calculate EF calculate_EF( FVC_path = FVC_path, TS_TA_path = TS_TA_path, output_path = output_path, n_intervals = 20, percentile = 0.01 )
# Check the output EF <- terra::rast(output_path) plot(EF)
These binaries (installable software) and packages are in development.
They may not be fully stable and should be used with caution. We make no claims about them.
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