AGRAPH; Complementary Software for Space Syntax Axial-Line Analyses Paper 070 at SSS7 KTH, Stockholm , June 2009 Bendik Manum, M.Arch, M.Sc., Ph.D Faculty of Architecture and Fine Art Norwegian University of Science and Technology Software Programming: Espen Rusten
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Bendik Manum, M.Arch, M.Sc., Ph.DFaculty of Architecture and Fine ArtNorwegian University of Science and Technology
Software Programming:Espen Rusten
Why more space syntax software?
-The possibility of doing all operations (modelling/ drawing, editing, calculation and making images suited for presentation) within one program, - without “external” (and expensive) software.
-When attempting to abstract a real urban space into a space syntax model you very soon look for other modelling/drawing options than the very basic axial-line model. Therefore, numerous software has been developed. Software that all together handle most of the options one might request, - but not yet in one single program. (Depthmap, S3, PLACESYNTAX, AJAX,Mindwalk ++)
Short on previous version of “AGRAPH”(presented at 5th Space Syntax Symposium)
A space syntax tool for drawing and calculating “node and connection models”
Main features:“Easy to use interface”, particularly aiming at drawing/modelling, calculating and making printable images within one software
• Drawing nodes and connections
• Colouring the nodes (here according to function)
• Justifying the graph by “click-and-drag” (and “snap to grid”)
• Saving the justified graph as printable image (of .jpg format)
• exporting table of space-syntax parameters
• Colouring nodes (vertexes) by space syntax parameters, (here: by integration, - as RA)
• Coloured by “depth from root-node” (here : upper right corner)
- or by Control Value
The new version, ”AGRAPH with line-mode”,- Software for axial-line analyses
The new version, ”AGRAPH with line-mode”,- Software for axial-line analyses
Main features:
Drawing/editing axial-maps, doing space-syntax calculations and making printable images within one software (similar to previous version, -“node- mode”)
Options for easy “modelling” of real-life situations not easily captured by “basic” (or “automatically generated”) axial-line models
• connect / disconnect (at a particular intersection)
• disconnect all intersections of a particular line- element (an reconnect to selected lines only)
• “merge lines” (manual merging of several lines into one “space-syntax-element”)
• “barrier lines” ( to model barrier-like traffic, when a street is a border or barrier rather that a “connecting space” )
(options useful for modelling situations such as bridges/tunnels, curved or slightly bended roads, “barrier-like-traffic” and “layer-like” spatial structures)
• Open AGRAPH,
• Select “Line mode”
Select background image (usually a map)
Select image file
If necessary: “rotate map”
zoom
“set line colour”
(if black does not work well with colours of map/ background image)
Turn on “draw lines” (by click button)
Draw line (by two mouse-clicks per line, not three or four)
“disconnect “ (“unlink”)
“show unlinks” (on/off)
“colour by integration”
(integration as RA, no normalisation RRA, i=1/RRA)
“merge lines”,
- for modelling curved or slightly bended roads
“merge lines”, Click at connection and then click “merge”
“show merged lines” (on/off)
Here, five lines merged (at four intersections)
merged lines becomes one space-syntax-element, - one element with no internal “space syntax distance”
integration,
- with five lines merged - with lines not merged
disconnect / connect
merge / unmerge
tunnels or bridges
(or stairs/elevators between floor-plans)
to draw a bridge or tunnel element:
select the line
then “disconnect at all links”
The line is now totally disconnected and must be manually connected at selected intersections
Here: connections made to “ring road”
Integration with “bridge/tunnel” connected to “ring-road”
What happens if merging “tunnel-line” with “ring-road-element” ? (describing a motorway-system without traffic jam ?)
Integration when “tunnel-line” is merged with “ring-road”
The option “barrier - line”
Select line (by click at line), then click “properties”
select property barrier = “true”
The barrier-line is now disconnected from other lines at all intersections, and the crossing lines are “cut in two”
The barrier-line must then be manually connected at selected intersections (if not done, the system will contain “disconnected line”)
Integration of axial-map with one “barrier-line”
“barrier-line”
Here “do calculation” after moving the “barrier-line”
(“breaking points” of crossing lines follow as a barrier-line is moved)