View source: R/apps_of_direction.R
mouthdist | R Documentation |
Calculates distance from river locations (given as vectors of segment and vertex) and the specified mouth of the river network. The mouth must first be specified (see setmouth).
mouthdist(seg, vert, rivers, stopiferror = TRUE, algorithm = NULL)
seg |
Vector of segments |
vert |
Vector of vertices |
rivers |
The river network object to use |
stopiferror |
Whether or not to exit with an error if a route cannot be
found. If this is set to |
algorithm |
Which route detection algorithm to use ( |
Distance (numeric)
Building routes from the river mouth to each river network segment and/or distance lookup tables will greatly reduce computation time (see buildsegroutes).
Matt Tyers
data(Gulk)
# Mouth must be specified
Gulk$mouth$mouth.seg <- 1
Gulk$mouth$mouth.vert <- 1
mouthdist(seg=4, vert=40, rivers=Gulk)
mouthdist(seg=c(4,5), vert=c(40,20), rivers=Gulk)
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