get_raindrop_trace: Get Raindrop Trace

In dblodgett-usgs/nhdplusTools: NHDPlus Tools

Get Raindrop Trace

Description

Uses a raindrop trace web service to trace the nhdplus digital elevation model to the nearest downslope flowline.

Usage

get_raindrop_trace(point, direction = "down")

Arguments

point	sfc POINT including crs as created by: sf::st_sfc(sf::st_point(.. ,..), crs)
direction	character "up", "down", or "none". Controls the portion of the split flowline that is returned along with the raindrop trace line.

Value

sf data.frame containing raindrop trace and requested portion of flowline.

Examples

point <- sf::st_sfc(sf::st_point(x = c(-89.2158, 42.9561)), crs = 4326)

(trace <- get_raindrop_trace(point))

if(inherits(trace, "sf")) {
bbox <- sf::st_bbox(trace) + c(-0.005, -0.005, 0.005, 0.005)

nhdplusTools::plot_nhdplus(bbox = bbox, cache_data = FALSE)

plot(sf::st_transform(sf::st_sfc(point, crs = 4326), 3857), add = TRUE)
plot(sf::st_transform(sf::st_geometry(trace)[1], 3857), add = TRUE, col = "red")
plot(sf::st_transform(sf::st_geometry(trace)[2], 3857), add = TRUE, col = "black")
}

dblodgett-usgs/nhdplusTools documentation built on March 26, 2024, 12:12 p.m.