Both clips a raster to polygon and aligns it to reference grid

align_raster() uses a polygon of a country to clip a raster and aligns the raster with a country grid that is created by create_grid(). Aligning implies that the resulting map will have the same dimensions, resolution, extent and projection as the country grid, and therefore can be stacked and combined with other spatial data.

align_raster(r, ref_grid, poly, method = "bilinear")

Arguments

r

SpatRaster or location of SpatRaster to be processed

ref_grid

SpatRaster or location of SpatRaster with the geometry that r should be resampled to

poly

SpatVector or sf object that will be used to clip r

method

character. Method used for estimating the new cell values. See terra::resample() for options.

Details

The selected method depends on the resolution. In case input maps have a lower or similar resolution than the model resolution, method = "bilinear" is recommended. In case input maps have a higher resolution, method = "sum" or method = "average" is recommended, depending on the type of data that is processed.

Note that input maps are resampled to the target resolution before they are clipped to the polygon. In this way the edges of the resulting raster will be more detailed than clipping a low-resolution map.

Examples

if (FALSE) {
align_raster(travel_time, grid, adm_map, method = "bilinear")
}