riverdistancemat: River Distance Matrix

In mbtyers/riverdist: River Network Distance Computation and Applications

River Distance Matrix

Description

Returns a matrix of distances between every point and every other point of given river locations (segment and vertex), or of a subset.

Usage

riverdistancemat(
  seg,
  vert,
  rivers,
  logical = NULL,
  ID = NULL,
  stopiferror = TRUE,
  algorithm = NULL
)

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, riverdistancemat 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
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.

Value

A matrix of distances (numeric) with rows and columns labeled by corresponding values of ID.

Note

Building routes from the river mouth to each river network segment and/or distance lookup tables will greatly reduce computation time (see buildsegroutes).

Author(s)

Matt Tyers

See Also

riverdistance

Examples

data(Gulk, fakefish)

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

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

mbtyers/riverdist documentation built on Jan. 16, 2024, 12:34 a.m.