Table 1 Selected street view indicators in the study.

From: Exploring the influence of urban green space and urban morphology on urban heat Islands using street view and satellite imagery

Indicators

Abbr

Description

Formulas

Green view index

GVI

Ratio of vegetation pixels in a panoramic image

\(GVI = \frac{{Pixel_{v} }}{{Pixel_{p} }}\)

Wall proportion

WALL

Fraction of the image occupied by walls

\(WALL= \frac{{Pixel}_{w}}{{Pixel}_{p}}\)

Road proportion

ROAD

Road pixel ratio in the image

 \(ROAD = \frac{{Pixel}_{r}}{{Pixel}_{p}}\)

Sidewalk proportion

SWALK

Proportion of sidewalk pixels in the image

\(SWALK =\) \(\frac{{Pixel}_{sw}}{{Pixel}_{p}}\)

Sky view factor

SVF

Street canyon openness based on the proportion of visible sky

 \(SVF = \frac{{Pixel}_{s}}{{Pixel}_{f}}\)

Building view factor

BVF

Proportion of buildings visible in the image

 \(BVF = \frac{{Pixel}_{b}}{{Pixel}_{f}}\)

  1. \({Pixel}_{v}\), total number of vegetation pixels; \({Pixel}_{p}\), total pixel count in a panoramic image. \({Pixel}_{w}\)​ = number of wall pixels; \({Pixel}_{r}\), number of road pixels; \({Pixel}_{sw}\), number of sidewalk pixels. \({Pixel}_{s}\), number of sky pixels; \({Pixel}_{f}\), number of pixels in the fisheye image; \({Pixel}_{b}\)​ , number of building pixels.
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