Download scanned IGN maps for a Sequoia project

Downloads one or several scanned map products (SCAN25, SCAN100, OACI or standard IGN maps) from the IGN WMS service for the parca layer of a Sequoia project.

Usage

seq_scan(
  dirname = ".",
  type = c("scan25", "scan100", "oaci", "carte_ign"),
  buffer = 1000,
  res = 0.8,
  crs = 2154,
  overwrite = FALSE,
  verbose = TRUE
)

Arguments

dirname

character Directory where the matrice file is located. Defaults to the current working directory.

type

character; One or several scanned map types to download. Must be one or more of:

• "scan25": SCAN25 topographic map

• "scan100": SCAN100 topographic map

• "oaci": OACI aeronautical chart

• "carte_ign": standard IGN map background

buffer

numeric; Buffer around x (in meters) used to enlarge the download area.

res

numeric; Spatial resolution of the output raster (in map units, usually meters).

crs

numeric or character; CRS of the returned raster.

overwrite

logical; If TRUE, the cached file is overwritten.

verbose

logical; If TRUE, display GDAL messages during download.

Value

A named list of file paths written by seq_write(), one per type.

Details

This function is a convenience wrapper looping over get_scan(), allowing the user to download several scanned map products in one call and automatically write them to the project directory using seq_write().

See also

get_scan(), seq_write()