Get Partial Flowpath Length — get_partial

Finds the upstream and downstream lengths along a given flowpath (flowline in NHDPlus terminology). Internally, the function rescales the aggregate_id_measure to a id_measure and applies that rescaled measure to the length of the flowpath.

Usage

get_partial_length(hydro_location, network = NULL, flowpath = NULL)

Arguments

hydro_location: list containing a hydrologic locations with names aggregate_id (reachcode) and aggregate_id_measure (reachcode measure).
network: data.frame network compatible with hydroloom_names.
flowpath: data.frame containing one flowpath that corresponds to the hydro_location. Not required if x is provided. x is not required if flowpath is provided.

Value

list containing up and dn elements with numeric length in km.

Examples


x <- sf::read_sf(system.file("extdata", "walker.gpkg", package = "hydroloom"))

hydro_location <- list(comid = 5329339,
                       reachcode = "18050005000078",
                       reach_meas = 30)

(pl <- get_partial_length(hydro_location, x))
#> $dn
#> [1] 1.4358
#> 
#> $up
#> [1] 3.3502
#>