About sDNA

sDNA is a hybrid academic, government and commercial project which originated at Cardiff School of Planning & Geography and the Sustainable Places Research Institute.

Our aim is to promote the practice of spatial network analysis through

  • Provision of software
  • Provision of training
  • Provision of a knowledge base as a foundation for evidence based decisions and policy

sDNA differs from previous forms of spatial network analysis by standardizing on the network link, thus enabling compatibility with existing link-node data and datasets.  Our continuous space enhancement to existing network algorithms allows us to ensure that accuracy is not lost by treating links as atomic rather than divisible entities.

sDNA is easy to use with existing map data, and we support numerous workflows:

  • ArcGIS and QGIS for analysts and researchers
  • Standalone shapefile processing for other GIS users
  • Autocad for architects and designers
  • Command line interface for scripting
  • Python interfaces for hackers

For more on the theory behind sDNA, see the following papers

Examples of work done with sDNA:


The sDNA Logo is actually a spatial network coloured according to one of the sDNA Output Measures.

Can you guess which one?