v.net.connectivity(1)

💖 v.net.connectivity 💖

okay bestie, welcome to the GRASS GIS User's Manual ✨ this one is v.net.connectivity(1) and it's giving network-graph main character energy, so let's get into it 🫶

✨ NAME ✨

v.net.connectivity — computes vertex connectivity between two sets of nodes in the network 💅

🎀 KEYWORDS 🎀

vector, network, connectivity

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🌸 SYNOPSIS 🌸

v.net.connectivity
v.net.connectivity --help
v.net.connectivity input=name  [arc_layer=string]   [node_layer=string]
[arc_column=name]   [arc_backward_column=name]  output=name
[node_column=name]   [set1_cats=range]   [set1_where=sql_query]
[set2_cats=range]   [set2_where=sql_query]   [--overwrite]  [--help]
[--verbose]  [--quiet]  [--ui]

🦋 Flags 🦋

• --overwrite — bestie, this one lets your output files just overwrite existing files. no hesitation. slay, but careful 💀
• --help — prints the usage summary, iykyk
• --verbose — verbose module output, she's chatty 💬
• --quiet — quiet module output, she's mysterious 🤫
• --ui — force launching the GUI dialog, for when you want the pretty buttons 🎀

💜 Parameters 💜

• input=name [required] — name of input vector map. Or, plot twist, a data source for direct OGR access ✨
• arc_layer=string — arc layer. lowkey important: vector features can have category values in different layers, and 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. same vibe as arc_layer fr: vector features can have category values in different layers, this number picks which one. 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), the reverse-girlie of the one above 🫶
• output=name [required] — name for output vector map 🌈
• node_column=name — node cost column (number) 👑
• set1_cats=range — set1 category values. Example: 1,3,7-9,13
• set1_where=sql_query — set1 WHERE conditions of SQL statement without 'where' keyword. Example: income < 1000 and population >= 10000
• set2_cats=range — category values. Set2 category values 💖
• set2_where=sql_query — set2 WHERE conditions of SQL statement without 'where' keyword. Example: income < 1000 and population >= 10000

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🔥 DESCRIPTION 🔥

v.net.connectivity computes vertex connectivity between two sets — aka the minimum number of vertices whose removal would separate two given sets. literally the "how many little guys do I have to take out to break these two apart" question 🧚

⭐ NOTES ⭐

The two sets (set1 and set2) get specified by their respective layer, where and cats parameters. no cap.

And listen — just like the v.net.flow module, capacities of nodes can be handed over via the node_column option 💅

v.net.connectivity finds the set of nodes of minimum total capacitiy separating the two given sets and outputs a map containing points on the positions of these nodes ✨

Default capacity, which is used when no column is specified, is one. periodt.

🌈 EXAMPLE 🌈

First one: find the minimum number of intersections separating roads on the left bank from roads on the right bank. iconic scenario tbh 🚗

v.net.connectivity input=roads output=roads_conn set1_where="bank=left" \
      set2_where="bank=right"

Second one, going full aviation:

v.net.connectivity input=airtraffic output=connectivity \
      set1_where="name=JFK" set2_where="name=Heathrow" node_column=capacity

💫 SEE ALSO 💫

v.net, v.net.flow, v.net.bridge

👑 AUTHORS 👑

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

🦋 SOURCE CODE 🦋

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

Accessed: Saturday Jan 17 05:41:26 2026

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© 2003-2025 GRASS Development Team, GRASS GIS 8.4.2 Reference Manual

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okay that's the whole page bestie, no notes, ate 💅 this was GRASS 8.4.2 dropping v.net.connectivity(1), last touched Saturday Jan 17 05:41:26 2026 — go forth and compute your connectivity, you've got this 🫶✨🌸