GEOGRAPHY & CARTOGRAPHY CALCULATOR
Zonesky View Factor
A precise tool.
What is the Zonesky View Factor & How does it work?
The Sky View Factor (SVF) quantifies the fraction of sky visible from a point on the urban surface. It is a dimensionless number ranging from 0 (completely obstructed) to 1 (completely open sky). SVF influences microβclimate, solar access, and thermal comfort in cities.
In practice, SVF is estimated by sampling horizon angles (ΞΈ) around a point and averaging the squared cosine of those angles. The more obstructed the view, the larger the horizon angles and the smaller the resulting SVF.
The standard formulation is:
SVF = frac{1}{N}sum_{i=1}^{N} cos^{2}(theta_{i})
SVF = Sky View Factor; ΞΈi = horizon angle in direction i (degrees); N = number of sampled directions.
Parameters
Result
β
Frequently Asked Questions
What is Sky View Factor (SVF)?
Sky View Factor quantifies the fraction of sky visible from a point, ranging from 0 (completely obstructed) to 1 (fully open sky).
How is SVF calculated?
SVF is estimated by sampling horizon angles around a point and averaging the squared cosine of those angles.
Why is SVF important in urban planning?
SVF influences micro-climate, solar access, and thermal comfort in cities, impacting energy use and human well-being.
How does obstructed view affect SVF?
A more obstructed view results in larger horizon angles, leading to a smaller Sky View Factor.
Can SVF be used for any terrain type?
While primarily used in urban areas, SVF can be applied to any terrain where sky visibility is of interest.
What tools are needed to measure SVF?
Tools such as digital elevation models (DEMs) and geographic information systems (GIS) are commonly used to calculate SVF.
How does SVF relate to building design?
SVF helps architects optimize building designs for better solar access, energy efficiency, and thermal comfort.
Results are for informational purposes only and do not constitute professional advice.