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, res, raw.dir)
SpatialPolygonsDataFrame
of the HUC4 regions within
the specified template
.