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Related Experiment Video

Updated: Dec 24, 2025

A Standardized Obstacle Course for Assessment of Visual Function in Ultra Low Vision and Artificial Vision
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Developing a simplified parameter for assessing view obstruction in high-rise high-density urban environment.

Y W Fung1, W L Lee1

  • 1Department of Building Services Engineering, Hong Kong Polytechnic University, Hung Hom, Hong Kong.

Habitat International
|April 15, 2020
PubMed
Summary

A new simple parameter, the average angle of unobstructed sky, effectively assesses view obstruction in urban properties. This method aids property market stakeholders in determining view premiums more accurately.

Keywords:
Angle of unobstructed skyHigh-densityHigh-riseResidentialShading maskView obstruction

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Area of Science:

  • Property valuation
  • Urban planning
  • Environmental science

Background:

  • Property prices are significantly influenced by views, but current assessment methods are inadequate for dense urban settings.
  • Existing methods for quantifying view obstruction lack simplicity and practicality for real estate stakeholders.
  • Legal disputes regarding views often hinge on daylight obstruction, suggesting a link to view quality.

Purpose of the Study:

  • To develop a straightforward parameter for assessing view obstruction levels in high-rise urban environments.
  • To establish a practical method for quantifying view quality that is easily applicable by property market stakeholders.
  • To correlate a new proposed parameter with existing complex simulation methods for validation.

Main Methods:

  • Literature review of view assessment methods and legal precedents concerning daylight obstruction.
  • Development of the average angle of unobstructed sky (θ) as a simplified metric.
  • Conducting case studies involving 708 residential units, comparing detailed computer simulations of shading mask values (SMK) with the proposed angle of unobstructed sky parameter.

Main Results:

  • A strong correlation was found between the average angle of unobstructed sky and mean shading mask values derived from complex simulations.
  • The average angle of unobstructed sky adequately approximates view obstruction levels predicted by detailed computer simulations.
  • The proposed parameter is easily determinable from a residential unit's geometrical properties.

Conclusions:

  • The average angle of unobstructed sky offers a simple yet effective tool for assessing view obstruction in urban properties.
  • This parameter can facilitate more accurate and consistent premium allocation for different view qualities.
  • The method's ease of use empowers property market stakeholders to make better-informed decisions regarding property valuation.