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UCL Depthmap - 0.3b / Windows

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Depthmap is a single software platform to perform a set of spatial network analyses designed to understand social processes within the built environment. It works at a variety of scales from building through small urban to whole cities or states. At each scale, the aim of the software is to produce a map of open space elements, connect them via some relationship (for example, intervisibility or overlap) and then perform graph analysis of the resulting network. The objective of the analysis is to derive variables which may have social or experiential significance.

At the building or small urban scale, Depthmap can be used to assess the visual accessibility in a number of ways. It can produce point isovists, that is, polygons representing the visually accessible area from a location, along with measures of those polygons (such as perimeter, area and so on), or it can further join a dense grid of isovists into a visibility graph of intervisible points (with graphs of up to about 1000000 point locations). The visibility graph may then be analysed directly using graph measures, or used as the core of an agent-based analysis. In the agent-based analysis a number of software agents representing pedestrians are released into the environment. Each software agent is able to access the visual accessibility information for its current location from the visibility graph, and this informs its choice of next destination. The numbers of agents passing through gates can be counted, and compared to actual numbers of pedestrians passing through gates.

At the small to medium urban scale, Depthmap can be used to derive an ‘axial map’ of a layout. That is, derive a reduced straight-line network of the open space in an environment. The axial map has been the staple of space syntax research for many years, but the mathematical derivation of it is novel. The automatic derivation allows an objective map for research into city form and function. Once the map has been generated, it may be analysed using graph measures, and the measures may be transferred to gate layers in order to compare with indicators of pedestrian or social behaviour. For larger systems where the derivation algorithm becomes cumbersome, pre-drawn axial maps may be imported.

Axial maps may be broken into segment maps, or segment maps, such as road-centre line maps, may be imported directly. These may be analysed using a variety of techniques, such as according to angular separation, road distance, or segment steps. For example, number of shortest angular paths through a segment may be calculated, or the average road distance from each segment to all others may be calculated.


· Visibility graph analysis
· Agent-based pedestrian modeling
· Axial, convex and segment analysis
· DXF and MapInfo MIF / MID import
· OpenStreetMap, Tiger Line and Ordnance Survey ITN layer loaders
· Text, SVG and EPS export

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