get_nldi_basin: Get NLDI Basin Boundary

In nhdplusTools: NHDPlus Tools

Get NLDI Basin Boundary

Description

Get a basin boundary for a given NLDI feature.

Usage

get_nldi_basin(nldi_feature, simplify = TRUE, split = FALSE)

Arguments

nldi_feature	list with names 'featureSource' and 'featureID' where 'featureSource' is derived from the "source" column of the response of dataRetrieval::get_nldi_sources() and the 'featureID' is a known identifier from the specified 'featureSource'.
simplify	logical should response geometry be simplified for visualization and performance?
split	logical should response resolve precisely to the location of the 'nldi_feature'? Setting 'TRUE' calls an additional service and will be slower and less robust.

Details

Only resolves to the nearest NHDPlus catchment divide. See: https://waterdata.usgs.gov/blog/nldi-intro/ for more info on the nldi.

Value

sf data.frame with result basin boundary

Examples

library(sf)
library(dplyr)

nldi_nwis <- list(featureSource = "nwissite", featureID = "USGS-05428500")

site <- get_nldi_feature(nldi_nwis)

basin <- get_nldi_basin(nldi_feature = nldi_nwis)

plot(st_geometry(basin))

basin

basin2 <- get_nldi_basin(nldi_feature = nldi_nwis,
                         simplify = FALSE, split = TRUE)

if(inherits(basin, "sf") & inherits(basin2, "sf")) {

length(st_coordinates(basin))
length(st_coordinates(basin2))

plot(st_geometry(st_buffer(site, units::set_units(3000, "m"))), border = NA)

plot(st_geometry(site), add = TRUE)
plot(st_geometry(basin2), add = TRUE)

plot(st_geometry(basin), border = "red", add = TRUE)

}

nhdplusTools documentation built on Dec. 7, 2022, 5:15 p.m.