| Title: | Calculation of the Water Deficit Index (WDI) and the Evaporative Fraction (EF) on Rasters |
|---|---|
| Description: | Calculates the Water Deficit Index (WDI) and the Evaporative Fraction (EF) using geospatial data, such as fractional vegetation cover (FVC) and surface-air temperature difference (TS-TA). Terms like "raster", "CRS" are part of standard geospatial terminology. |
| Authors: | Gaelle Hamelin [aut, cre]
|
| Maintainer: | Gaelle Hamelin <[email protected]> |
| License: | GPL-3 |
| Version: | 1.0.2 |
| Built: | 2024-12-02 14:06:54 UTC |
| Source: | CRAN |
This function calculates the EF from two rasters: fractional vegetation cover (FVC) and the surface-air temperature difference (TS-TA). It saves the resulting EF raster to the specified output path.
calculate_EF( FVC_path, TS_TA_path, output_path, n_intervals = 20, percentile = 0.01 )calculate_EF( FVC_path, TS_TA_path, output_path, n_intervals = 20, percentile = 0.01 )
FVC_path |
Character. File path to the FVC raster.Must have the same CRS and extent as the TS-TA raster. |
TS_TA_path |
Character. File path to the raster of TS-TA (surface-air temperature difference). TS and TA must have the same unit of measurement (Kelvin preferably). |
output_path |
Character. File path where the EF raster will be saved. |
n_intervals |
Integer. Number of intervals for splitting FVC values (default: 20). |
percentile |
Numeric. Percentage used for identifying wet and dry edges (default: 0.01). |
The input rasters (FVC and TS-TA) must have the same CRS (Coordinate Reference System) and extent.
If they differ, the function will attempt to reproject and resample the rasters automatically.
A raster object representing the Evaporative Fraction (EF).
# Paths to example data included in the package library(terra) FVC_raster <- rast(system.file("extdata", "FVC_reduced.tif", package = "wdiEF")) TS_TA_raster <- rast(system.file("extdata", "TS_TA_reduced.tif", package = "wdiEF")) # Output path (temporary file for example purposes) output_path <- tempfile(fileext = ".tif") # Run the function calculate_EF( FVC_path = FVC_raster, TS_TA_path = TS_TA_raster, output_path = output_path, n_intervals = 20, percentile = 0.01 ) # Print the output path print(output_path)# Paths to example data included in the package library(terra) FVC_raster <- rast(system.file("extdata", "FVC_reduced.tif", package = "wdiEF")) TS_TA_raster <- rast(system.file("extdata", "TS_TA_reduced.tif", package = "wdiEF")) # Output path (temporary file for example purposes) output_path <- tempfile(fileext = ".tif") # Run the function calculate_EF( FVC_path = FVC_raster, TS_TA_path = TS_TA_raster, output_path = output_path, n_intervals = 20, percentile = 0.01 ) # Print the output path print(output_path)
This function calculates the WDI from two rasters: fractional vegetation cover (FVC) and the surface-air temperature difference (TS-TA). It saves the resulting WDI raster to the specified output path.
calculate_WDI( FVC_path, TS_TA_path, output_path, n_intervals = 20, percentile = 0.01 )calculate_WDI( FVC_path, TS_TA_path, output_path, n_intervals = 20, percentile = 0.01 )
FVC_path |
Character. File path to the FVC raster.Must have the same CRS and extent as the TS-TA raster. |
TS_TA_path |
Character. File path to the raster of TS-TA (surface-air temperature difference). TS and TA must have the same unit of measurement (Kelvin preferably). |
output_path |
Character. File path where the WDI raster will be saved. |
n_intervals |
Integer. Number of intervals for splitting FVC values (default: 20). |
percentile |
Numeric. Percentage used for identifying wet and dry edges (default: 0.01). |
The input rasters (FVC and TS-TA) must have the same CRS (Coordinate Reference System) and extent.
If they differ, the function will attempt to reproject and resample the rasters automatically.
A raster object representing the Water Deficit Index (WDI).
# Paths to example data included in the package library(terra) FVC_raster <- rast(system.file("extdata", "FVC_reduced.tif", package = "wdiEF")) TS_TA_raster <- rast(system.file("extdata", "TS_TA_reduced.tif", package = "wdiEF")) # Output path (temporary file for example purposes) output_path <- tempfile(fileext = ".tif") # Run the function calculate_WDI( FVC_path = FVC_raster, TS_TA_path = TS_TA_raster, output_path = output_path, n_intervals = 20, percentile = 0.01 ) # Print the output path print(output_path)# Paths to example data included in the package library(terra) FVC_raster <- rast(system.file("extdata", "FVC_reduced.tif", package = "wdiEF")) TS_TA_raster <- rast(system.file("extdata", "TS_TA_reduced.tif", package = "wdiEF")) # Output path (temporary file for example purposes) output_path <- tempfile(fileext = ".tif") # Run the function calculate_WDI( FVC_path = FVC_raster, TS_TA_path = TS_TA_raster, output_path = output_path, n_intervals = 20, percentile = 0.01 ) # Print the output path print(output_path)