For those who are interested, here are some resources on Visibility Graph
Analysis
Alasdair has set up a website for VGA at UCL's VR Centre which can be found
at http://www.vr.ucl.ac.uk/vga Sometimes the link is a bit flakey, so you
may need to go to http://www.vr.ucl.ac.uk and follow the links to
"Research" and "Visibility Graph Analysis". The best bibliographies that I
have found so far are in the two papers by Turner et al. that can be found
at the same site:
http://www.vr.ucl.ac.uk/alasdair/publications/1999b.html (full paper is at
http://www.vr.ucl.ac.uk/vga/isss.pdf)
http://www.vr.ucl.ac.uk/alasdair/publications/2000a.html (the full paper
used to be available on the web, now contact Alasdair for info)
Examples of the output from Intelligent Space's multi-platform Java
software for Visibility Graph Analysis, which is called "Fathom" , can be
seen at http://www.intelligentspace.com (click on the "about intelligent
space" section and the "office interaction" section).
Ruth Conroy has put some examples of the output of a program called "Omni
Vista" that she is using for her PhD research at
http://www.ruth.conroy.net/images.htm including an interesting new measure
called "Drift", which is a calculation of the distance between the view
point of the isovist and its centre of gravity.
The CASA Working Paper 5 (http://www.casa.ucl.ac.uk/tate.pdf) by Batty,
Conroy et al. has more examples of visibility graph analysis applied to the
Tate Gallery in London and some examples of Ruth's data on patterns of
people moving in a VRML model of the Tate using a headset. The relationship
between the two is striking.
A report on the testing of the VR Centre's "Depthmap" VGA software on
live projects that I wrote last year whilst working at the VR Centre can be
found at http://www.vr.ucl.ac.uk/vga/report or if that doesn't work because
the link is a bit flakey go to http://www.vr.ucl.ac.uk/ and follow the
links to "Research" and "Visibility Graph Analysis" and then the "Using
Visibility Graph Analysis" link.
Information on "Depthmap", the current UCL software for VGA and its use in
combination with a GIS platform can be found at
http://www.vr.ucl.ac.uk/vga/IsovistGIS
David O'Sullivan has been involved with the VGA work at the VR Centre but
has also applied graph theory to the analysis of spatial systems using
cellular automata, see http://www.casa.ucl.ac.uk/~david/gca.html
Benedikt's own site contains references to software that he developed on a
unix platform to analyse visual envelopes in buildings and landscapes and
work he has done on software for using isovist analysis in commercial
buildings.
http://mather.ar.utexas.edu/center/benedikt_cv.html
The Spatialist software at Georgia Tech can apparently also be used to
calculate isovists, but I'm not sure whether the graph matrix is saved or
what graph measures are implemented. See
http://murmur.arch.gatech.edu/~spatial/what_iso.htm
Information about a Mac based program that calculates isovists can be found
at http://wallstreet.colorado.edu/pastproj/isovist/isovist.html
Has anyone else got any interesting links?
Jake
----------------------------------------------------------------------------
Dr. Jake Desyllas
Partner
Intelligent Space
1 Torriano Mews
London NW5 2RZ
phone: 020 7267 7392
fax: 020 7428 0782
email [log in to unmask]
http://www.intelligentspace.com
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
|