get_nhdplus: Get National Hydrography Dataset V2 Subsets...

In nhdplusTools: NHDPlus Tools

Get National Hydrography Dataset V2 Subsets (Multirealization)

Description

Subsets NHDPlusV2 features by location (POINT), area (POLYGON), or set of COMIDs. Multi realizations are supported allowing you to query for flowlines, catchments, or outlets.

Usage

get_nhdplus(
  AOI = NULL,
  comid = NULL,
  nwis = NULL,
  realization = "flowline",
  streamorder = NULL,
  t_srs = NULL
)

Arguments

AOI	sf (MULTI)POINT or (MULTI)POLYGON. An 'area of interest' can be provided as either a location (sf POINT) or area (sf POLYGON) in any Spatial Reference System.
comid	numeric or character. Search for NHD features by COMID(s)
nwis	numeric or character. Search for NHD features by collocated NWIS identifiers
realization	character. What realization to return. Default is flowline and options include: outlet, flowline, catchment, and all
streamorder	numeric or character. Only return NHD flowlines with a streamorder greater then or equal to this value for input value and higher. Only usable with AOI and flowline realizations.
t_srs	character (PROJ string or EPSG code) or numeric (EPSG code). A user specified - target -Spatial Reference System (SRS/CRS) for returned objects. Will default to the CRS of the input AOI if provided, and to 4326 for ID requests.

Details

The returned object(s) will have the same Spatial Reference System (SRS) as the input AOI. If a individual or set of IDs are used to query, then the default geoserver CRS of EPSG:4326 is preserved. In all cases, a user-defined SRS can be passed to t_srs which will override all previous SRS (either input or default). All buffer and distance operations are handled internally using in EPSG:5070 Albers Equal Area projection

Value

sfc a single, or list, of simple feature objects

Examples

 point <- sf::st_sfc(sf::st_point(c(-119.845, 34.4146)), crs = 4326)
 get_nhdplus(point)
 get_nhdplus(point, realization = "catchment")
 get_nhdplus(point, realization = "all")
 get_nhdplus(comid = 101)
 get_nhdplus(nwis  = c(11120000, 11120500))
 area <- sf::st_as_sfc(sf::st_bbox(c(xmin = -119.8851, xmax =-119.8361,
 ymax = 34.42439, ymin = 34.40473), crs = 4326))
 get_nhdplus(area)
 get_nhdplus(area, realization = "flowline", streamorder = 3)
 

nhdplusTools documentation built on June 22, 2024, 10:36 a.m.