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Download BRGM geology data to a geometry

get_geol.Rd

Downloads BRGM geology layers for the departments intersecting x (or for specified departments) and spatially filters them using a buffered envelope around x.

Usage

get_geol(
  x,
  key = "carhab",
  buffer = 100,
  deps = NULL,
  cache = NULL,
  verbose = FALSE,
  overwrite = FALSE
)

Arguments

x

sf or sfc; Geometry used to determine relevant departments and to spatially filter geology data.

key

character Source use to download geology from BRGM. Must be one of:

  • "carhab" : geological data used to created the CarHab dataset ;

  • "bdcharm50" : geological maps, vectorized and harmonised at 1:50,000 scale.

buffer

numeric; Buffer distance (in meters) applied to x before spatial filtering. Default is 100.

deps

character or numeric; One or sevral french department code (see get_cog()).

cache

character; Storage directory. Defaults to the user cache directory (see tools::R_user_dir()).

verbose

logical If TRUE, display messages.

overwrite

logical If TRUE, overwrite zipfile.

Value

An sf object containing clipped geology features.

Details

The function:

  • Identifies departments intersecting x (if deps is not provided) ;

  • Downloads geology layers using get_brgm() ;

  • Filters features intersecting a buffered envelope around x.

All geometries are returned in EPSG:2154.