riverdirectionmat: River Direction Matrix

Description

Returns a matrix of calculated travel direction between every point and every other point of given river locations (segment and vertex), or of a subset. The mouth (lowest point) segment and vertex must be specified (see setmouth).

Usage

riverdirectionmat(
  seg,
  vert,
  rivers,
  logical = NULL,
  ID = NULL,
  flowconnected = FALSE,
  stopiferror = TRUE,
  algorithm = NULL
)

Value

A matrix of directions (character) with rows and columns labeled by corresponding values of ID. See riverdirection for additional information.

Arguments

seg: A vector of river locations (segment component).
vert: A vector of river locations (vertex component).
rivers: The river network object to use
logical: A boolean vector that can be used for subsetting - if used, riverdirectionmat() will only return pairwise distances in which a specified condition is met.
ID: a vector of observation IDs for aid in interpreting the output table
flowconnected: If TRUE, only returns direction if the input segments are flow-connected. Defaults to FALSE.
stopiferror: Whether or not to exit with an error if a route cannot be found. If this is set to FALSE and a route cannot be found, the function will return NA in the appropriate entry. Defaults to TRUE. See detectroute.
algorithm: Which route detection algorithm to use ("Dijkstra", "sequential", or "segroutes"). If left as NULL (the default), the function will automatically make a selection. See detectroute for more details.

Author

Matt Tyers

Examples

Run this code

data(Gulk, fakefish)

# Mouth must be specified
Gulk$mouth$mouth.seg <- 1
Gulk$mouth$mouth.vert <- 1

logi1 <- (fakefish$flight.date==as.Date("2015-11-25"))

riverdirectionmat(seg=fakefish$seg, vert=fakefish$vert, rivers=Gulk, logical=logi1)