Raw data from sunrise till sunset were summarized after quality control tests. Methods of processing data followed those used in the IDMP (International Daylight Measurement Programme) in Japan [2].
(1) Daily average values, standard deviations and the numbers of the data classified by solar altitude in 6-degree intervals separately in the morning and afternoon,
(2) Monthly average values, standard deviations and the numbers of the data classified by solar altitude in 6-degree intervals separately in the morning and afternoon,
(3) Daily average values, standard deviations and the numbers of the data classified by half-hourly intervals,
(4) Monthly average values, standard deviations and the numbers of the data classified by half-hourly intervals.
Tables 1 to 3 show examples of monthly processed data in May 1992 by solar altitude in 6-degree intervals. The total numbers of processed data were 15, 627 on illuminance and 17, 646 on zenith luminance.