Load PRISM Monthly "Normals" at 800 meter or 4 kilometer Resolution

newhall_prism_cache(): Uses the prism package to download and cache data at the specified resolution. At this time only monthly grids for 30 year Normals (1991-2020) are supported.

newhall_prism_rast(): Create a SpatRaster object. This object contains temperature and precipitation data for the specified data set, at the specified resolution, using the standard jNSM column naming scheme.

newhall_prism_subset(): Used to create a subset of the PRISM data corresponding to the extent of an input spatial object x.

newhall_nad83_template(): Empty SpatRaster corresponding to the lower 48 United States PRISM data/extent at the specified resolution.

newhall_prism_cache(
  resolution = "800m",
  overwrite = FALSE,
  PRISM_PATH = file.path(newhall_data_dir("cache"), "PRISM")
)

newhall_prism_rast(
  resolution = "800m",
  PRISM_PATH = file.path(newhall_data_dir("cache"), "PRISM"),
  bilfile = list.files(file.path(PRISM_PATH, resolution), "\\.bil$", recursive = TRUE)
)

newhall_prism_subset(
  x,
  resolution = "800m",
  template = newhall_nad83_template(resolution = resolution),
  PRISM_PATH = file.path(newhall_data_dir("cache"), "PRISM")
)

newhall_nad83_template(resolution = "800m")

Arguments

resolution: character. Either "800m" (default) or "4km"
overwrite: Force download of new cache files? Default: FALSE.
PRISM_PATH: Default: file.path(newhall_data_dir("cache"), "PRISM")
bilfile: Optional: custom vector of paths to files to use to build raster. Defaults to all .BIL files in the specified cache directory and resolution.
x: A SpatVector, SpatRaster, SpatExtent, or any other object type suitable to use with terra::crop().
template: Template SpatRaster or target CRS specification for re-projection. Default: newhall_nad83_template()

Value

character. Vector of file paths (to PRISM .BIL files).

Details

Currently used only for matching the ISSR800 source to PRISM.

References

PRISM Climate Group, Oregon State University, https://prism.oregonstate.edu, data created 4 Feb 2014, accessed 22 Jul 2023.

Examples


newhall_nad83_template()
#> class       : SpatRaster 
#> dimensions  : 3105, 7025, 28  (nrow, ncol, nlyr)
#> resolution  : 0.008333333, 0.008333333  (x, y)
#> extent      : -125.0208, -66.47917, 24.0625, 49.9375  (xmin, xmax, ymin, ymax)
#> coord. ref. : lon/lat NAD83 

newhall_nad83_template("4km")
#> class       : SpatRaster 
#> dimensions  : 621, 1405, 28  (nrow, ncol, nlyr)
#> resolution  : 0.04166667, 0.04166667  (x, y)
#> extent      : -125.0208, -66.47917, 24.0625, 49.9375  (xmin, xmax, ymin, ymax)
#> coord. ref. : lon/lat NAD83