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SKY VIEW FACTOR
Sky View refers to the sky seen by a surface
The percentage of the sky that is visible from the surface geometry (as opposed to Sky Exposure, which is the amount of sky seen by the points). While Sky Exposure treats each patch of the sky with relatively equal weight, sky view weights these patches by their area projected into the plane of the surface being evaluated. In other words. sky view for a horizontal surface would give more importance to the sky patches that are overhead vs near the horizon.
WHY IS IT IMPORTANT
Sky view Factor is an important metric for modelling urban heat island since the inability of warm urban surfaces to radiate heat to a cool night sky is one of the largest contributors of the heat island effect.