---
name: "v.net.bridge"
section: "1grass"
platform: "linux"
package: "grass-doc"
version: "8.4.1-1"
release: "Debian 13 (Trixie)"
platforms: ["linux"]
url: "https://new.carta.tech/v.net.bridge"
---

# v.net.bridge(1grass)

Computes bridges and articulation points in the network.

## NAME

**v.net.bridge**  - Computes bridges and articulation points in the network.

## KEYWORDS

vector, network, articulation points

## SYNOPSIS

**v.net.bridge**\
 **v.net.bridge --help**\
 **v.net.bridge** **input**=*name* **output**=*name*  \[**arc\_layer**=*string*\]   \[**node\_layer**=*string*\]   \[**arc\_column**=*name*\]   \[**arc\_backward\_column**=*name*\]   \[**node\_column**=*string*\]  **method**=*string*  \[--**overwrite**\]  \[--**help**\]  \[--**verbose**\]  \[--**quiet**\]  \[--**ui**\]

### Flags:

- **--overwrite**

  Allow output files to overwrite existing files

- **--help**

  Print usage summary

- **--verbose**

  Verbose module output

- **--quiet**

  Quiet module output

- **--ui**

  Force launching GUI dialog

### Parameters:

- **input**=*name* **\[required\]**

  Name of input vector map\
   Or data source for direct OGR access

- **output**=*name* **\[required\]**

  Name for output vector map

- **arc\_layer**=*string*

  Arc layer\
   Vector features can have category values in different layers. This number determines which layer to use. When used with direct OGR access this is the layer name.\
   Default: *1*

- **node\_layer**=*string*

  Node layer\
   Vector features can have category values in different layers. This number determines which layer to use. When used with direct OGR access this is the layer name.\
   Default: *2*

- **arc\_column**=*name*

  Arc forward/both direction(s) cost column (number)

- **arc\_backward\_column**=*name*

  Arc backward direction cost column (number)

- **node\_column**=*string*

  Node cost column (number)

- **method**=*string* **\[required\]**

  Feature type\
   Options: *bridge, articulation*\
   **bridge**: Finds bridges\
   **articulation**: Finds articulation points

## DESCRIPTION

*v.net.bridge* finds bridges and articulation points in a network.

## NOTES

Bridge in a network is an edge/line whose removal would disconnect the (sub-)network. A node is an articulation point if its removal would disconnect the (sub-)network. For more information and formal definitions check the wikipedia entries: bridge and articulation point.

The output of the module contains the selected features. For **method=bridge**, lines corresponding to bridges are copied from the input map to the output map. On the other hand, for **method=articulation**, points are created on the positions of articulation points.

In GRASS GIS, *line* is not always a single line segment. It might be, and often is, a sequence of line segments between two intersections. Also, articulation point is a standard graph theoretic terminology which is slightly misleading in GRASS. An articulation point in graph theory is an articulation *node* in GRASS terminology.

## SEE ALSO

*v.net,* *v.category*

## AUTHORS

Daniel Bundala, Google Summer of Code 2009, Student\
 Wolf Bergenheim, Mentor

## SOURCE CODE

Available at: v.net.bridge source code (history)

Accessed: Monday Feb 24 17:51:18 2025

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