nhd_load function

Load NHD layers into current session

nhd_load(
  state,
  dsn,
  file_ext = NA,
  approve_all_dl = FALSE,
  temporary = FALSE,
  wkt_filter = NA,
  ...
)

Arguments

• state: character state abbreviation
• dsn: character name of a NHD layer
• file_ext: character choice of "shp" for spatial data and "dbf" or "gpkg" for non-spatial. optional
• approve_all_dl: logical blanket approval to download all missing data. Defaults to TRUE if session is non-interactive.
• temporary: logical set FALSE to save data to a persistent rappdirs location
• wkt_filter: character. WKT spatial filter for selection. See sf::st_read
• ...: arguments passed to sf::st_read

Returns

Spatial simple features object or data frame depending on the dsn type and value passed to file_ext

Details

This function will ask the user to approve downloading missing data unless approve_all_dl is set to TRUE.

Examples

## Not run:

dt <- nhd_load(c("RI"), c("NHDWaterbody"))
dt <- nhd_load(c("CT", "RI"), "NHDWaterbody")
dt <- nhd_load(c("CT", "RI"), "NHDWaterbody", quiet = TRUE)
dt <- nhd_load("MI", "NHDFlowline")
dt <- nhd_load("RI", "NHDReachCrossReference")
dt <- nhd_load("RI", "NHDWaterbody", file_ext = "dbf")
dt <- nhd_load(c("RI", "DC"), "NHDWaterbody", file_ext = "gpkg")

dt <- nhd_load("RI", "NHDWaterbody", wkt_filter = "POINT (-71.575 41.438)")

dt <- nhd_load("RI", "NHDFlowline", pretty = FALSE, quiet = TRUE,
  query = paste0("SELECT * from ", "NHDFlowline", " LIMIT 1"))
## End(Not run)