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Calculate Soil Moisture Grid, Linear Trapezoid

Source: R/trapezoid_utilities.R
linear_soil_moisture.Rd

Prepare soil moisture grid from STR and VI images for a single date, using linear trapezoid method, and using the derived slope and intercept coefficients

Usage

linear_soil_moisture(coeffs, VI, STR)

Arguments

coeffs,

list, 4 trapezoid coefficients

VI,

SpatRaster, the vegetation index raster

STR,

SpatRaster, the STR raster

Value

rast, soil moisture grid

Note

This function is used after preparing the OPTRAM model coefficients with: optram_wetdry_coefficients. Typically a new image date, (that was not used for preparing the model), will be referenced in the img_date parameter. The resulting soil moisture raster is saved to output_dir.

Examples

img_date <- "2023-03-11"
VI_dir <- system.file("extdata", "NDVI", package = "rOPTRAM")
STR_dir <- system.file("extdata", "STR", package = "rOPTRAM")
SM <- optram_calculate_soil_moisture(img_date,
            VI_dir, STR_dir,
            data_dir = tempdir())
#> No coefficients file, Exiting...