get_split_catchment {nhdplusTools}

Get split catchment

Description

Uses catchment splitting web service to retrieve the portion of a catchment upstream of the point provided.

Usage

get_split_catchment(point, upstream = TRUE)

Arguments

point

scf POINT including crs as created by: sf::st_sfc(sf::st_point(.. ,..), crs)

upstream

logical If TRUE, the entire drainage basin upstream of the point provided is returned in addition to the local catchment.

Value

sf data.frame containing the local catchment, the split portion and optionally the total drainage basin.

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")) {

(snap_point <- sf::st_sfc(sf::st_point(trace$intersection_point[[1]]),
                          crs = 4326))

(catchment <- get_split_catchment(snap_point))

bbox <- sf::st_bbox(catchment) + c(-0.005, -0.005, 0.005, 0.005)

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

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

(catchment <- get_split_catchment(snap_point, upstream = FALSE))

bbox <- sf::st_bbox(catchment) + c(-0.005, -0.005, 0.005, 0.005)

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

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

pour_point <- sf::st_sfc(sf::st_point(x = c(-89.25619, 42.98646)), crs = 4326)

(catchment <- get_split_catchment(pour_point, upstream = FALSE))

bbox <- sf::st_bbox(catchment) + c(-0.005, -0.005, 0.005, 0.005)

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

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