get_nhd_subregion
returns a list of SpatialPolygonsDataFrame
s of the layers of the HUC4 subregion,
within the specified template
. If template is not provided, returns the entire HUC4 subregion.
get_nhd_subregion(template = NULL, area, raw.dir)
A Raster* or Spatial* object to serve as a template for cropping.
A 4-character string indicating the HUC4 NHD subregion to download and crop.
A character string indicating where raw downloaded files should be put. The directory will be created if missing.
A SpatialPolygonsDataFrame
of the HUC4 regions within
the specified template
.