Downloads or reuses the current NOAA BlueTopo tile-scheme catalog and returns every published tile footprint. This function does not require an area of interest and does not download any bathymetry rasters.
Usage
bluertopo_tile_polygons(
cache_dir = bluertopo_cache_dir(),
refresh = "if_stale",
quiet = FALSE
)Arguments
- cache_dir
A non-empty character path for the package cache. The session-temporary default avoids writing to the user's home directory. Set an explicit path to reuse catalogs, source files, and VRTs across sessions.
- refresh
A character scalar controlling catalog access:
"if_stale","never", or"always"."never"requires an existing cached catalog and performs no catalog request.- quiet
A length-one logical suppressing routine informational messages.
Value
A terra::SpatVector containing all current BlueTopo tile polygons
and their standardized catalog metadata, including tile ID, native
resolution, UTM zone, source URLs, and expected SHA-256 checksums.