set_graph_directionality

The input graph can be either directed or undirected. If directed, then it is made undirected before directionality is assigned.

Indices for assessing riverscape fragmentation, including the Dendritic Connectivity Index, the Population Connectivity Index, the River Fragmentation Index, the Probability of Connectivity, and the Integral Index of connectivity. For a review, see Jumani et al. (2020) <doi:10.1088/1748-9326/abcb37> and Baldan et al. (2022) <doi:10.1016/j.envsoft.2022.105470> Functions to calculate temporal indices improvement when fragmentation due to barriers is reduced are also included.

Baldan D.

riverconn

Fragmentation and Connectivity Indices for Riverscapes

Damiano Baldan

David Cunillera-Montcusi

Andrea Funk

set_graph_directionality function

<dl><dt>graph</dt>
<dd>an 'igraph' object representing a river structure where reaches are nodes and confluences (or fragmentation items) are links.</dd>
<dt>field_name</dt>
<dd>a character value that flags the vertices attribute used to designate the outlet.
Each vertex must have an unique value for this field.</dd>
<dt>outlet_name</dt>
<dd>a character value corresponding to the 'field_name' attribute</dd></dl>

Arguments

Create directed river graph based on outlet flag — set_graph_directionality

<dl>

<dt>graph</dt>
<dd>an 'igraph' object representing a river structure where reaches are nodes and confluences (or fragmentation items) are links.</dd>


<dt>field_name</dt>
<dd>a character value that flags the vertices attribute used to designate the outlet.
Each vertex must have an unique value for this field.</dd>


<dt>outlet_name</dt>
<dd>a character value corresponding to the 'field_name' attribute</dd>

</dl>

set_graph_directionality: Create directed river graph based on outlet flag

Description

Usage

Value

Arguments

Examples