findNLDI: R Client for the Network Linked Data Index

In dataRetrieval: Retrieval Functions for USGS and EPA Hydrology and Water Quality Data

R Client for the Network Linked Data Index

Description

Provides a formal client to the USGS Network Linked Data Index.

Usage

findNLDI(
  comid = NULL,
  nwis = NULL,
  wqp = NULL,
  huc12 = NULL,
  location = NULL,
  origin = NULL,
  nav = NULL,
  find = c("flowlines"),
  distance_km = 100,
  no_sf = FALSE,
  warn = TRUE
)

Arguments

comid	numeric or character. An NHDPlusV2 COMID
nwis	numeric or character. A USGS NWIS surface water siteID
wqp	numeric or character. A water quality point ID
huc12	numeric or character. A WBD HUC12 unit ID
location	numeric vector. Coordinate pair in WGS84 SRS ordered lng/lat (X,Y)
origin	named list. Specifying a feature type and ID (e.g. list("comid" = 101))
nav	character vector. where to navigate from the starting point. Options include along the upper mainsteam (UM), upstream tributary (UT), downstream mainstem (DM) and downstream divergences (DD). You may select one or more of the abbreviations ("UM", "UT", DM", "DD").
find	character vector. Define what resources to find along the navigation path(s) (see get_nldi_sources()$source). Can also include 'basin' or 'flowline', which will return the upstream basin of the starting feature or flowlines along the navigation respectively. The default is "flowlines". If you provide any other resource, AND want flowlines, then flowlines must be explicitly requested.
distance_km	numeric. Define how far to look along the navigation path in kilometers (default = 100)
no_sf	if available, should 'sf' be used for parsing, defaults to 'TRUE' if 'sf' is locally installed
warn	(default TRUE) should warnings be printed

Details

The function is useful for topology and location based feature discovery. A user must specify an origin feature, optional navigation direction(s) along the network, as well as features to identify along the navigated paths. Valid starting options can be given by one of the following arguments: comid, nwis, huc12, wqp, location, and start.

Value

a list of data.frames if sf is not installed, a list of sf objects if it is

Examples

# Find Features / Define origin features

## Find feature by COMID
findNLDI(comid = 101)

## Find feature by NWIS ID
findNLDI(nwis = "11120000")

## Find feature by WQP ID
findNLDI(wqp = "USGS-04024315")

## Find feature by LOCATION
findNLDI(location = c(-115, 40))

## GENERAL ORIGIN: COMID
findNLDI(origin = list("comid" = 101))

## GENERAL ORIGIN: WaDE
findNLDI(origin = list("wade" = "CA_45206"))

# Navigation (flowlines will be returned if find is unspecified)
# UPPER MAINSTEM of USGS-11120000
findNLDI(nwis = "11120000", nav = "UM")

# MULTI-REQUEST
# UPPER MAINSTEM and TRIBUTARY of USGS-11120000
findNLDI(nwis = "11120000", nav = c("UT", "UM"))

# Discover Features(flowlines will not be returned unless included in find)

## Find feature(s) on the upper tributary of USGS-11120000
findNLDI(nwis = "11120000", nav = "UT", find = c("nwis", "wqp"))

## Find upstream basin boundary and  of USGS-11120000
findNLDI(nwis = "11120000", find = "basin")

# Control Distance
## Limit search to 50 km
findNLDI(comid = 101, nav = "DM", find = c("nwis", "wqp", "flowlines"), distance_km = 50)

dataRetrieval documentation built on Oct. 31, 2024, 9:07 a.m.