Add Vertices To Maintain a Minimum Distance Between Vertices

In certain cases, such as when there is a lake within a river system, there may be long, straight lines in a river network with vertices only at either end. In these cases, any point data along these stretches would be snapped to the vertices at either end. This function automatically adds equally-spaced vertices along the straight line, according to a specified minimum allowable distance between vertices.

addverts(rivers, mindist = 500)

Arguments

rivers	The river network object to use.
mindist	The minimum distance to use between vertices. Defaults to 500.

Value

A new river network object with the specified segments connected (see rivernetwork)

Note

This function is called within cleanup, which is recommended in most cases.

See also

line2network

Examples

data(Kenai3)
Kenai3split <- addverts(Kenai3,mindist=200)
#> Note: any point data already using the input river network must be re-transformed to river coordinates using xy2segvert() or ptshp2segvert().

zoomtoseg(seg=c(47,74,78), rivers=Kenai3)
points(Kenai3$lines[[74]])        # vertices before adding

zoomtoseg(seg=c(47,74,78), rivers=Kenai3split)
points(Kenai3split$lines[[74]])   # vertices after adding