download_groads: Download roads data

In amadeus: Accessing and Analyzing Large-Scale Environmental Data

Download roads data

Description

The download_groads() function accesses and downloads roads data from NASA's Global Roads Open Access Data Set (gROADS), v1 (1980-2010).

Usage

download_groads(
  data_region = c("Americas", "Global", "Africa", "Asia", "Europe", "Oceania East",
    "Oceania West"),
  data_format = c("Shapefile", "Geodatabase"),
  directory_to_save = NULL,
  acknowledgement = FALSE,
  download = FALSE,
  remove_command = FALSE,
  unzip = TRUE,
  remove_zip = FALSE,
  hash = FALSE
)

Arguments

data_region	character(1). Data can be downloaded for "Global", "Africa", "Asia", "Europe", "Americas", "Oceania East", and "Oceania West".
data_format	character(1). Data can be downloaded as "Shapefile" or "Geodatabase". (Only "Geodatabase" available for "Global" region).
directory_to_save	character(1). Directory to save data. Two sub-directories will be created for the downloaded zip files ("/zip_files") and the unzipped shapefiles ("/data_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 zip files. Default is TRUE.
remove_zip	logical(1). Remove zip files from directory_to_download. Default is FALSE.
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.

• Zip and/or data files will be downloaded and stored in respective sub-directories within directory_to_save.

Author(s)

Mitchell Manware, Insang Song

References

\insertRef

data_ciesin2013groadsamadeus

Examples

## Not run: 
download_groads(
  data_region = "Americas",
  data_format = "Shapefile",
  directory_to_save = tempdir(),
  acknowledgement = TRUE,
  download = FALSE, # NOTE: download skipped for examples,
  remove_command = TRUE,
  unzip = FALSE
)

## End(Not run)

amadeus documentation built on April 4, 2025, 12:21 a.m.