Measurement of sky view factor by spherical camera, Google Street View and Digital Surface Model

Abstract

The sky view factor measurements were conducted using fisheye lens camera, spherical camera, Google Street View, and Digital Surface Model (DSM). As a result, it was found that in addition to the conventional fisheye lens camera, the spherical camera, Google Street View, DSM can be practically used for the measurement of the sky view factor. In using Google Street View and DSM, it was necessary to confirm that the buildings and the land use at the time of measurement did not change. In the case of measurement in forest and on road with street trees, the ratio of the branches and leaves after binarization is the cause of the error, and attention is necessary for the proper selection of threshold value in binarization.