traverse_flowlines: traverse_flowlines

In hydrolinks: Hydrologic Network Linking Data and Tools

Description

traverse hydrological network

Usage

traverse_flowlines(max_distance, start, direction = c("out", "in"),
  dataset = c("nhdh", "nhdplusv2"), max_steps = 10000, db_path = NULL,
  ...)

Arguments

max_distance	maximum distance to traverse in km. If negative, traverse until the ocean (node 0) or max_steps is reached.
start	character node to start
direction	character; either "out" or "in"
dataset	which network dataset to traverse. May be either NHD high-res or NHD Plus v2.
max_steps	maximum traversal steps before terminating
db_path	manually specify path to flowtable database. Useful for avoiding database locks when running traversals in parallel.
...	options passed on to check_dl_file

Value

dataframe of nodes traversed, distance from the start node to each node, and the children of each node.

Examples

## Not run: 
traverse_flowlines(1000, "141329377", "out", "nhdh")
# this example traverses until a cycle is found and the end of the network is reached.

## End(Not run)

hydrolinks documentation built on May 1, 2019, 8:08 p.m.