---
title: 3.4.3 Find a ‘minimal set’ for a space
description: The Isovist_App can be used to estimate the minimal connected series of locations required to give complete visual coverage of a space. Known as the ‘minimal set’, the resulting set of nodes and edges is a precursor to a true…
url: "https://isovists.org/user-guide/3-4-3-find-a-minimal-set-for-a-space/"
updated: "2024-02-15"
category: 3 How To... / 3.4 Run Advanced Analysis
---

# 3.4.3 Find a ‘minimal set’ for a space

The Isovist_App can be used to estimate the minimal connected series of locations required to give complete visual coverage of a space. Known as the ‘minimal set’, the resulting set of nodes and edges is a precursor to a true spatial graph. 

To find a minimal set:

- Set up a drawing and open the isovist analysis menu as normal.
- Select the ‘find a minimal set’ option at the foot of the menu
- Using the cursor, click at the desired ‘root’ location of the minimal set. Doing so defines an origin for the estimation process to begin from.
- Wait… the process of estimating a minimal set should be visible on screen as a sequence that gradually generates nodes (rings) and edges (lines). The nodes are scaled relative to their importance in the minimal set structure.
- Clicking again in an alternate location will restart the estimation from the new root point. 
- To increase or decrease the accuracy of the estimation, edit the slider provided. Increasing accuracy slows the estimation process.
- To hide the minimal set results, toggle the ‘find a minimal set’ option off again.

[https://player.vimeo.com/video/442105932?autopause=0&autoplay=1&muted=1&loop=1&title=0byline=0&portrait=0](https://player.vimeo.com/video/442105932?autopause=0&autoplay=1&muted=1&loop=1&title=0byline=0&portrait=0)

*Above: Finding minimal set candidates in Kahn’s Fischer House*