Resample a raster of secondary weights — secondary

The secondary_weights() function resamples a raster of interest to the desired resolution and outputs a table of weights for use in the function overlay_weights().

Usage

secondary_weights(secondary_raster, grid = era5_grid, extent = "full")

Arguments

secondary_raster: a raster of a secondary variable, for example cropland coverage or population
grid: a raster layer with the same spatial resolution as the climate data
extent: an optional extent to crop the secondary_raster to for faster processing. Format must be compatible with raster::crop(). The default is "full", which resamples the whole secondary raster without cropping.

Value

a data.table of secondary weights

Examples

secondary_weights_output <- secondary_weights(
  secondary_raster = cropland_nj_2015, # A raster of cropland to resample
                                       # and convert to a data.table
  grid = era5_grid, # The grid to resample the secondary_raster to (`era5_grid`
                    # is the default)
  extent = "full" # The default, which resamples the whole secondary raster
                  # without cropping (`'full'` is the default)
  )
#> Checking for raster alignment
#> Longitude coordinates do not match. Aligning longitudes to standard coordinates.
#> Resampling secondary_raster
#> Creating a table of weights

head(secondary_weights_output)
#>         x     y    weight
#>     <num> <num>     <num>
#> 1: -76.25 41.75 0.2294976
#> 2: -76.00 41.75 0.2198315
#> 3: -75.75 41.75 0.1777267
#> 4: -75.50 41.75 0.1362904
#> 5: -75.25 41.75 0.1061073
#> 6: -75.00 41.75 0.1215708