TY - JOUR
T1 - Sky view factor measurement by using a spherical camera
AU - Honjo, Tsuyoshi
AU - Lin, Tzu Ping
AU - Seo, Yuhwan
N1 - Publisher Copyright:
© 2019, Society of Agricultural Meteorology of Japan. All Rights Reserved.
PY - 2019
Y1 - 2019
N2 - Sky view factor (SVF) is a ratio of sky in upper hemisphere and is an important index for many environmental studies. Frequently used method for measuring SVF is taking fisheye image of upper hemisphere by a camera with fisheye lens (Nikon FC-E8 and FC-E9). In this study, we devised the usage of a spherical camera (RICOH Theta S), which can takes a picture with 360° field of view (FOV), for SVF measurement. Applicability of the spherical camera to the measurement of SVF is tested by comparing with conventional fisheye cameras. The result showed that it can take the same quality of fisheye images as conventional fisheye camera and can be applied to the measurement of SVF. Accuracy and causes of errors are considered and as a conclusion, the spherical camera has enough performance for the replacement of conventional cameras. The algorithm of making fisheye images of different projection methods and of calculating SVF are written as programs in R.
AB - Sky view factor (SVF) is a ratio of sky in upper hemisphere and is an important index for many environmental studies. Frequently used method for measuring SVF is taking fisheye image of upper hemisphere by a camera with fisheye lens (Nikon FC-E8 and FC-E9). In this study, we devised the usage of a spherical camera (RICOH Theta S), which can takes a picture with 360° field of view (FOV), for SVF measurement. Applicability of the spherical camera to the measurement of SVF is tested by comparing with conventional fisheye cameras. The result showed that it can take the same quality of fisheye images as conventional fisheye camera and can be applied to the measurement of SVF. Accuracy and causes of errors are considered and as a conclusion, the spherical camera has enough performance for the replacement of conventional cameras. The algorithm of making fisheye images of different projection methods and of calculating SVF are written as programs in R.
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U2 - 10.2480/agrmet.D-18-00027
DO - 10.2480/agrmet.D-18-00027
M3 - Article
AN - SCOPUS:85067201741
SN - 0021-8588
VL - 75
SP - 59
EP - 66
JO - Journal of Agricultural Meteorology
JF - Journal of Agricultural Meteorology
IS - 2
ER -