4 How the Calculations Work – Isovists.org

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1 Introduction

1.1 What is the Isovist_App?
1.2 What can the Isovist_App do?

2 Getting Started

2.1 First, does the Isovist_App correlate?
2.2 System requirements
2.3 Downloading and installing
2.4 Running the software for the first time

3.1 Perform Basic Functions:

3.1.1 Prepare and load a drawing for analysis
3.1.2 Optimise and troubleshoot drawing imports
3.1.3 Shrink the Isovist_App to a moveable window
3.1.4 Edit an imported drawing
3.1.5 Use layer management
3.1.6 Set the scale and analysis areas of an import
3.1.7 Change the resolution of a field analysis
3.1.8 Increase the speed of zoom scrolling
3.1.9 Link areas of a drawing, such as floors
3.1.10 Save and reopen an analysis file

3.2 Run Primary Analysis

3.2.1 Place or remove isovists within a space
3.2.2 Change the overall isovist parameters
3.2.3 View different spatial categories of isovist
3.2.4 Measure isovist values at the cursor location
3.2.5 Measure isovist values along a path
3.2.6 Measure values in a field analysis

3.3 View and Export Results

3.3.1 Export point isovist data
3.3.2 View and export visual step depth data
3.3.3 Export numeric field data from all locations
3.3.4 Overlay annotations upon an isovist field
3.3.5 Export vector drawings of isovist geometries
3.3.6 Export high resolution images

3.4 Run Advanced Analysis

3.4.1 Numerically compare two or more fields
3.4.2 Draw a ‘visual graph diagram’ for a space
3.4.3 Find a ‘minimal set’ for a space
3.4.4 Generate a ‘spatial co-visibility’ profile
3.4.5 Generate isovist rose diagrams
3.4.6 Generate and export an Minkowski model
3.4.7 Generate agent trails and visibility fields
3.4.8 Set start and end points for agent exploration
3.4.9 Calculate an optimal route through a field
3.4.10 Review ‘spatial wobble’ characteristics

4.1 The Calculation Methods

4.1.1 The stochastic approach
4.1.2 Isovist Geometry Calculation
4.1.3 Local Isovist Scanning
4.1.3 Stochastic Isovist Overlap
4.1.4 Mean Aggregate Isovist Cascade Analysis

4.2 Isovist Measure Definitions

4.2.1 Area
4.2.2 Perimeter & Closed Perimeter
4.2.3 Compactness
4.2.4 Occlusivity
4.2.5 Vista Length
4.2.6 Average Radial
4.2.7 Drift
4.2.8 Variance
4.2.9 Skewness

4.3 Space Syntax Measure Definitions

4.3.1 Directed Visibility
4.3.2 Co-Visibility
4.3.3 Overt Control
4.3.4 Covert Control
4.3.5 Counterpoint
4.3.6 Choice
4.3.7 Metric Depth and Mean Metric Depth
4.3.8 Visual Depth and Mean Visual Depth
4.3.9 Integration (HH)
4.3.10 Angular Depth and Mean Angular Depth

5 Reference and Support

5.1 Crashes, bugs and other horrors
5.2 Change log
5.3 Bibliography
5.4 Notes and Acknowledgements

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4 How the Calculations Work

4 How the Calculations Work

4.1 The Calculation Methods
4.2 Isovist Measure Definitions
4.3 Space Syntax Measure Definitions

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