riverdirectiontofrom: River Direction Matrix between Two Datasets

In riverdist: River Network Distance Computation and Applications

River Direction Matrix between Two Datasets

Description

Returns a matrix of directions between each river location in two datasets, with one expressed as rows and the other expressed as columns.

Usage

riverdirectiontofrom(
  seg1,
  vert1,
  seg2,
  vert2,
  rivers,
  logical1 = NULL,
  logical2 = NULL,
  ID1 = NULL,
  ID2 = NULL,
  flowconnected = FALSE,
  stopiferror = TRUE,
  algorithm = NULL
)

Arguments

seg1	First vector of river locations (segment component). These are expressed as rows in the output matrix.
vert1	First vector of river locations (vertex component). These are expressed as rows in the output matrix.
seg2	Second vector of river locations (segment component). These are expressed as columns in the output matrix.
vert2	Second vector of river locations (vertex component). These are expressed as columns in the output matrix.
rivers	The river network object to use.
logical1	A boolean vector that can be used for subsetting. If used, riverdirectiontofrom will only return directions in which a specified condition is met for the first dataset.
logical2	A boolean vector that can be used for subsetting. If used, riverdirectiontofrom will only return directions in which a specified condition is met for the second dataset.
ID1	a vector of observation IDs for the first dataset that will be used as row names in the output matrix.
ID2	a vector of observation IDs for the second dataset that will be used as column names in the output matrix.
flowconnected	If TRUE, only returns distance 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.

Value

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

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

riverdirection

Examples

data(Gulk)

streamlocs.seg <- c(1,8,11)
streamlocs.vert <- c(50,70,90)
streamlocs.ID <- c("A","B","C")

fish.seg <- c(1,4,9,12,14)
fish.vert <- c(10,11,12,13,14)
fish.ID <- c("fish1","fish2","fish3","fish4","fish5")

Gulk <- setmouth(seg=1, vert=1, rivers=Gulk)

riverdirectiontofrom(seg1=streamlocs.seg, vert1=streamlocs.vert,
  seg2=fish.seg, vert2=fish.vert, rivers=Gulk,
  ID1=streamlocs.ID, ID2=fish.ID)

logi1 <- streamlocs.ID=="B" | streamlocs.ID=="C"
logi2 <- fish.ID!="fish3"

riverdirectiontofrom(seg1=streamlocs.seg, vert1=streamlocs.vert,
  seg2=fish.seg, vert2=fish.vert, rivers=Gulk, logical1=logi1,
  logical2=logi2, ID1=streamlocs.ID, ID2=fish.ID)

riverdist documentation built on Aug. 22, 2023, 5:06 p.m.