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Download National Hydrography Dataset (NHD) data

Source: R/development.R
download_huc.Rd

NHDPlus data provides the most comprehensive and high-resolution hydrography data. This function downloads national dataset from NHDPlus Version 2.1 on USGS Amazon S3 storage.

Usage

download_huc(
  region = c("Lower48", "Islands"),
  type = c("Seamless", "OceanCatchment"),
  directory_to_save = NULL,
  acknowledgement = FALSE,
  download = FALSE,
  remove_command = FALSE,
  unzip = FALSE,
  hash = FALSE
)

Arguments

region

character(1). One of c("Lower48", "Islands"). When "Islands" is selected, the data will be downloaded for Hawaii, Puerto Rico, and Virgin Islands.

type

character(1). One of c("Seamless", "OceanCatchment").

directory_to_save

character(1). Directory to download files.

acknowledgement

logical(1). By setting TRUE the user acknowledges that the data downloaded using this function may be very large and use lots of machine storage and memory.

download

logical(1). FALSE will generate a *.txt file containing all download commands. By setting TRUE the function will download all of the requested data files.

remove_command

logical(1). Remove (TRUE) or keep (FALSE) the text file containing download commands.

unzip

logical(1). Unzip the downloaded compressed files. Default is FALSE. Not working for this function since HUC data is in 7z format.

hash

logical(1). By setting TRUE the function will return an rlang::hash_file() hash character corresponding to the downloaded files. Default is FALSE.

Value

  • For hash = FALSE, NULL

  • For hash = TRUE, an rlang::hash_file character.

  • Downloaded files will be stored in directory_to_save.

Note

For HUC, set type = "Seamless". HUC12 layer presents in the seamless geodatabase. Users can aggregate HUC12 layer to make HUC6, HUC8, HUC10, etc. For whom wants to download a specific region, please visit Get NHDPlus Data

References

U.S. Geological Survey (2023). “National Hydrography Dataset (NHD) – USGS National Map Downloadable Data Collection.” https://www.usgs.gov/national-hydrography.

Author

Insang Song

Examples

if (FALSE) { # \dontrun{
download_huc(
  region = "Lower48",
  type = "Seamless",
  directory_to_save = tempdir(),
  acknowledgement = TRUE,
  download = FALSE, # NOTE: download skipped for examples,
  remove_command = TRUE,
  unzip = FALSE
)
} # }