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dc.contributorAnurak Chakporen
dc.contributorอนุรักษ์ จักป้อth
dc.contributor.advisorLI XIen
dc.contributor.advisorLI XIth
dc.contributor.otherBurapha University. Faculty of Geoinformaticsen
dc.descriptionMaster Degree of Science (M.Sc.)en
dc.descriptionวิทยาศาสตรมหาบัณฑิต (วท.ม.)th
dc.description.abstractThe skyglow is normally scattering from the sources of natural light and human light sources. The artificial lighting also maximizes the night sky brightness. The Nighttime Light (NTL), released directly skyward by luminaires and reflected from the ground, is dispersed by aerosol particles in the atmosphere, generating a luminous background. This results in visual impairment or the loss of star visualization. The skyglow is fully varying upon the specific environmental circumstances, the weather surroundings, a substantial amount of particles in the atmosphere, the intensity of light directed upward and the visual angle. This phenomenon leads to an impoverished environment and bad weather surroundings. SNPP-VIIRS (DNB) can be utilized as a unique source for monitoring skyglow phenomena and NTL spatial expansion. A scatter plot model was applied to the sky brightness and radiance data. Additionally, the sky brightness and radiance from NPP-VIIRS exhibited R2 values of 0.9488, which were a significantly strong relationship through the nonlinear regression. Furthermore, the correlation of summer sky brightness and winter sky brightness in Chiang Mai province had a value of 0.9655and 0.7090 in the urban and rural areas, respectively. In January, the Bortle scale map presenting the colour shade showed clearly the sequential area in between the contrast of forest area and rural area. The dark sky area (Level 1) covered up to 68.73% of Northern Thailand. In April, there was the severity of the skyglow, which was clearly visible in yellow (Level 5), covering 55% of Northern Thailand. Bortle scale map was excellent in the estimation of skyglow. The skyglow profile showed the sky brightness of suburban and rural areas; the peak of sky brightness in winter was higher than in summer 0.3-0.5 mag/arcsec2. In the forest area or the gap of light intensity in each peak, the sky brightness in summer was higher than in winter. The difference in sky brightness in winter and summer was up to 1.45 times. Contribution of a higher AOD value, as a result, the brightness of the light decreased and increased the base of the scattering radius. This research also estimated and transformed the sky brightness unit for a more straightforward astronomical interpretation. The skyglow escalates a growing threat to optical astronomy research. Basically, the skyglow is the scientific rationale for optical astronomy research and astronomical sites. Finally, the Bortle scale map and the skyglow profile are the crucial research tools for monitoring light pollution and a better understanding the skyglow characteristics in the north of Thailand.en
dc.publisherBurapha University
dc.rightsBurapha University
dc.subjectNighttime Lighten
dc.subjectLight Pollutionen
dc.subjectBortle Scaleen
dc.subject.classificationEnvironmental Scienceen
dc.subject.classificationEarth and Planetary Sciencesen
Appears in Collections:Faculty of Geoinformatics

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