nhdplusTools (version 1.3.2)

get_elev_along_path: Get Elevation Along Path (experimental)

Description

Uses a cross section retrieval web services to retrieve elevation along a path.

Usage

get_elev_along_path(points, num_pts, res = 1, status = TRUE)

Value

sf data.frame containing points retrieved. Names include "id", "distance_m", "elevation_m", "spatial_ref", "geometry", and ".group". .group tracks which input point each set of output points belongs to.

Arguments

points

sf data.frame containing a point column.

num_pts

numeric number of points to retrieve along the cross section.

res

integer resolution of 3D Elevation Program data to request. Must be on of: 1, 3, 5, 10, 30, 60.

status

logical

Examples

# \donttest{
point1 <- sf::st_sfc(sf::st_point(x = c(-105.9667, 36.17602)), crs = 4326)
point2 <- sf::st_sfc(sf::st_point(x = c(-105.97768, 36.17526)), crs = 4326)
point3 <- sf::st_sfc(sf::st_point(x = c(-105.98869, 36.17450)), crs = 4326)

points <- sf::st_as_sf(c(point1, point2, point3))

(xs <- get_elev_along_path(points, 100))

if(inherits(xs, "sf")) {

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

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

plot(sf::st_transform(sf::st_geometry(xs), 3857), pch = ".", add = TRUE, col = "red")
plot(sf::st_transform(sf::st_sfc(point1, crs = 4326), 3857), add = TRUE)
plot(sf::st_transform(sf::st_sfc(point2, crs = 4326), 3857), add = TRUE)
plot(sf::st_transform(sf::st_sfc(point3, crs = 4326), 3857), add = TRUE)

plot(xs$distance_m, xs$elevation_m)
}

# }