Occlusion maps are qualitative, plan-based visualization tools composed of multiple, distributed isovist polygons. This paper formalizes occlusion maps as a reproducible analytical framework. The paper provides a theoretical overview of existing qualitative methods while defining and exploring the key parameters that govern the production of occlusion maps. The primary result is a framework that bridges the gap between qualitative visualization and computational rigor by establishing parameter stability as a condition of methodological validity, thereby enabling systematic, cross-case comparisons not possible with existing methods. In this way, the research advances the field by providing a robust and replicable method for visibility analysis.
BattyM (2001) Exploring isovist fields: space and shape in architectural and urban morphology. Environment and Planning B: Planning and Design28: 123–150. https://doi.org/10.1068/b2725
2.
BenediktM (1979) To take hold of space: isovists and isovist fields. Environment and Planning B: Planning and Design6(1): 47–65. https://doi.org/10.1068/b060047
3.
ChristensonM (2008) Questioning the primacy of visual simulation in an epistemology of digital models. In: MuylleM (ed) 26th eCAADe Conference.Antwerp, Belgium: Education and Research University College of Antwerp in Computer Aided Architectural Design in Europe and Artesis, 889–896. Available at:https://doi.org/10.52842/conf.ecaade.2008.889
4.
ChristensonM (2010) Registering visual permeability in architecture: isovists and occlusion maps in AutoLISP. Environment and Planning B: Planning and Design37(6): 1128–1136. https://doi.org/10.1068/b36076
5.
ChristensonM (2023) The generative function of the occlusion map: Square spirals and the structure of visibility. Design Studies85: 101169. Available at:https://doi.org/10.1016/j.destud.2023.101169
6.
DaltonRCDaltonN (2015) The problem of representation of 3D isovists. In: KarimiKVaughanLSailerK, et al. (eds) 10th International Space Syntax Symposium. London, UK: University College London, pp. 141.1–141.18.
7.
DaltonRCDaltonNMcElhinneyS, et al. (2022) Isovist in a grid: benefits and limitations. In 13th International Space Syntax Symposium (edsvan NesAde KoningRE), pp. 551.1-551.17. Bergen, Norway: Western Norway University of Applied Sciences. https://doi.org/10.3929/ethz-b-000594112
8.
DavisLSBenediktML (1979) Computational models of space: isovists and isovist fields. Computer Graphics and Image Processing11(1): 49–72. https://doi.org/10.1016/0146-664X(79)90076-5
9.
DosenASOstwaldMJ (2017) Lived space and geometric space: comparing people’s perceptions of spatial enclosure and exposure with metric room properties and isovist measures. Architectural Science Review60(1): 62–77. https://doi.org/10.1080/00038628.2016.1235545
FranzGWienerJM (2008) From space syntax to space semantics: a behaviorally and perceptually oriented methodology for the efficient description of the geometry and topology of environments. Environment and Planning B: Planning and Design35(4): 574–592. https://doi.org/10.1068/b33050
12.
HabreS (2000) Exploring students’ strategies to solve ordinary differential equations in a reformed setting. The Journal of Mathematical Behavior18(4): 455–472. https://doi.org/10.1016/S0732-3123(00)00024-9
13.
HansonJ (1994) Deconstructing’ architects’ houses. Environment and Planning B: Planning and Design21: 675–704. https://doi.org/10.1068/b210675
14.
JohanesMHuangJ (2022) Latent isovist: discovery of machine-human interpretable spatial properties using inverted GANs. In: AkbarzadehMAvivDJamelleH, et al. (eds) 42nd Annual Conference of the Association of Computer Aided Design in Architecture. Philadelphia, USA: ACADIA, pp. 672–683.
15.
JohanesMHuangJ (2025) Latent distribution: measuring floor plan typicality with isovist representation learning. Frontiers of Architectural Research14: 1585–1601. https://doi.org/10.1016/j.foar.2025.05.006
16.
KimGKimAKimY (2019) A new 3D space syntax metric based on 3D isovist capture in urban space using remote sensing technology. Computers, Environment and Urban Systems74: 74–87. https://doi.org/10.1016/j.compenvurbsys.2018.11.009
17.
MarkhedeHKochD (2007) Positioning analysis: social structures in configurative modelling In: 6th International Space Syntax Symposium (Eds AS Kubat, Ö Ertekin, Yİ Güney and E Eyüboğlu), Istanbul, Türkiye, 12-15 June 2007. Istanbul, Türkiye: ITU Faculty of Architecture, pp. 069.1–069.14.
18.
MorelloERattiC (2009) A digital image of the city: 3D isovists in Lynch’s urban analysis. Environment and Planning B: Planning and Design36(5): 837–853. https://doi.org/10.1068/b34144t
19.
Omrani AzizabadSMahdavinejadMHadighiM (2024) Three-dimensional embodied visibility graph analysis: investigating and analyzing values along an outdoor path. Environment and Planning B: Urban Analytics and City Science52: 1669–1684. https://doi.org/10.1177/23998083241303199
20.
OstwaldMJDawesMJ (2013) Using isovists to analyse architecture: methodological considerations and new approaches. The International Journal of the Constructed Environment3(1): 85–106. https://doi.org/10.18848/2154-8587/CGP/v03i01/37373
21.
OstwaldMJDawesMJ (2018) Isovist analysis, theories and methods. In: DawesMJOstwaldMJ (eds) The Mathematics of the Modernist Villa. Cham: Birkhäuser, pp. 95–124. https://doi.org/10.1007/978-3-319-71647-3_4
22.
OstwaldMJDawesMJ (2020) Isovists: spatio-Visual mathematics in architecture. In: SriramanB (ed) Handbook of the Mathematics of the Arts and Sciences. Cham: Springer. https://doi.org/10.1007/978-3-319-70658-0_5-3
23.
PeponisJDaltonRCWinemanJ, et al. (2004) Measuring the effects of layout upon visitors’ spatial behaviors in open plan exhibition settings. Environment and Planning B: Planning and Design31(3): 453–473. https://doi.org/10.1068/b3041
24.
PorterT (1979) How Architects Visualize. New York: Van Nostrand Reinhold.
25.
StampsAE (2005) Isovists, enclosure, and permeability theory. Environment and Planning B: Planning and Design32(5): 735–762. https://doi.org/10.1068/b31138
26.
StavroulakiGPeponisJ (2005) Seen in a different light: icons in Byzantine museums and churches. In: 5th International Space Syntax Symposium (eds Van NesA), pp. 251–263. Delft, Netherlands: TU Delft.
27.
SuárezM (2024) Inference and Representation: A Study in Modeling Science. Chicago: University of Chicago Press.
28.
TurnerAPennA (1999) Making isovists syntactic: isovist integration analysis. In: 2nd International Space Syntax Symposium (ed HansonJ), pp. 01(9), 1–01. Brasília, Brazil: Universidade de Brasília.
29.
TurnerADoxaMO’SullivanD, et al. (2001) From isovists to visibility graphs: a methodology for the analysis of architectural space. Environment and Planning B: Planning and Design28(1): 103–121. https://doi.org/10.1068/b2684
30.
WienerJMFranzG (2004) Isovists as a means to predict spatial experience and behavior. In: FreksaCKnauffMKrieg-BrücknerB, et al. (eds) 2004 International Conference on Spatial Cognition. Berlin: Springer, pp. 42–57. https://doi.org/10.1007/978-3-540-32255-9_3
31.
YangPPPutraSYLiW (2007) Viewsphere: a GIS-Based 3D visibility analysis for urban design evaluation. Environment and Planning B: Planning and Design34(6): 971–992. https://doi.org/10.1068/b32142
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