sDNA+

The following is a comparison of features in sDNA vs sDNA+.

Currently sDNA+ is only available to our research partners, but we are open to collaboration – if you are interested please get in touch!

In addition to the features listed below, new features will be made available to partners as they are developed. Features currently under discussion include:

  • Tools and workflow for model/error checking large scale 3d networks
  • Improved user interface for advanced features of sDNA Integral
  • More suggestions from research partners – we are open to discussion.
current feature list sdna sdna+
Multi scale analysis
euclidean network radii in continuous space
Euclidean geodesics
Angular geodesics
Custom link data geodesics
3d geodesics
taking account of height change in route choice
One way geodesics
respecting one way systems, escalators etc
Random perturbations to geodesics
modelling uncertainty and diversity in route choice
Hybrid geodesics
combining all the above based on user formula
Advanced geodesic analysis and handling
for conflicts between euclidean radius and angular/other geodesics
Output destination shapes and data
distance maps, isochrones, isokampters etc
Output geodesic shapes and data
profile population exposure along travel routes, users of given links etc
Output network buffer shapes and data
accessibility analysis
Output convex hull shapes and data
accessibility analysis
Selective origin processing
for detailed analysis of selected locations
Link centre type overrides
Link weighting
a cornerstone of our methodology as links almost always proxy interesting human activity
Length Weighting
some people like this too
Custom weighting
based on user data per link or unit length
Separate origin/destination weighting
when you know where people are going
Network preparation tool
removing split links, duplicates, cluster tolerance problems, traffic islands and isolated systems
Network preparation tool preserves numeric data
either absolute or per unit length
Mean distance accessibility measures
for each geodesic type
Gravity model type accessibility measures
network quantity penalized by distance
Customizable gravity model measures
as above with user parameters
Betweenness measures
predictions of flow
Two step floating catchment
modified betweenness and quantity measures
Raw quantity measures
links, length, weight, angularity, geodesic lengths
Junction measures
junctions and connectivity
Severence measures
diversion ratios
Efficiency measures
based on convex hull geometry
Individual link measures
angularity, sinuosity, bearing, length, connectivity
ArcGIS plugin
for arcgis 10.0 onwards
ArcGIS match symbology tool
useful for displaying multiple networks on the same scale
Autocad plugin
for all products in the autocad family including map3d
(2d modelling only) 
Autocad convert from link-unlink format
useful for preparing hand-designed networks
Standalone shapefile processor
for compatibility with other gis
Command line interface
for scripting large sets of analyses
Python programming interface
for complex analysis and parametric design
Multi core, multi CPU support
for faster analyses
Subsampling
allowing to trade off accuracy for increased speed
Large scale networks
using a 64 bit platform to process over 500,000 links