Trim a River Network Object to Specified Segments

Removes line segments from a river network object. User can specify which segments to remove (trim) or which segments to keep (trimto).

trimriver(trim = NULL, trimto = NULL, rivers)

Arguments

trim

Vector of line segments to remove
trimto

Vector of line segments to keep
rivers

The river network object

Value

A new river network object

Note

Specifying segments in both trim and trimto arguments will result in an error.

See also

line2network

Examples

data(Kenai1)
plot(x=Kenai1)

Kenai1.trim <- trimriver(trim=c(46,32,115,174,169,114,124,142,80), rivers=Kenai1)
#> Note: any point data already using the input river network must be re-transformed to river coordinates using xy2segvert() or ptshp2segvert().
plot(x=Kenai1.trim)

Kenai1.trim.2 <- trimriver(trimto=c(20,57,118,183,45,162,39,98,19), rivers=Kenai1)
#> Note: any point data already using the input river network must be re-transformed to river coordinates using xy2segvert() or ptshp2segvert().
plot(x=Kenai1.trim.2)