upstream: Simple topology analysis Simple functions for extracting...
In flee-group/watershed: Tools for Watershed Delineation

upstream

R Documentation

Simple topology analysis Simple functions for extracting information from river topologies

Description

Simple topology analysis Simple functions for extracting information from river topologies

Usage

.upstream(Tx, j)

.downstream(Tx, i)

.headwater(Tx)

.outlet(Tx)

.is_headwater(Tx)

.is_outlet(Tx)

.upstream_r(i, x, Tx)

Arguments

`Tx`	A (pixel or reach) topology
`i, j`	Focal node
`x`	A stream raster stack (as produced by `delineate()`)

Details

upstream/downstream take a single node as input, and return the up- or downstream node. Outlets/headwaters analyzes the entire toplogy and finds nodes that have no downstream or upstream neighbours.

Value

The id (corresponding to dims of Tx) of the desired node(s)

For .upstream_r, A named2-column matrix, 'to' is the downstream reach (i.e., i) and 'from' contains ids of the reach(es) upstream of i; or NULL if there are none

flee-group/watershed documentation built on July 25, 2022, 12:46 p.m.