Generate regional layers for a Sequoia project

Retrieves official IGN regional datasets intersecting the project area and writes the resulting layers to disk.

Usage

seq_ifn(
  dirname = ".",
  key = get_keys("ifn"),
  verbose = TRUE,
  overwrite = FALSE
)

dirname: character Path to the project directory. Defaults to the current working directory.
key: character; List of ifn layer identifiers to download. If not provided, the function uses get_keys("ifn") to automatically select all MNHN layers defined in the Sequoia configuration (inst/config/seq_layers.yaml)
verbose: logical; whether to display informational messages. Defaults to TRUE.
overwrite: logical; whether to overwrite existing files. Defaults to FALSE.

Invisibly returns a named list of file paths written by seq_write(). Returns NULL invisibly if no regional layer is written.

Regional datasets are retrieved using get_ifn() based on the project area defined by the PARCA polygon.

Each regional layer is written to disk using seq_write() with a dedicated output key corresponding to the requested region k.

If no feature is found for a given k, the corresponding layer is not written.