Integration of Intervisibility and Perception Assessment to Evaluate Spatial Visual Pollution from Outdoor Advertisements: A Case Study of Wongwian Yai
Bangkok has planned to improve the cityscape of Wongwian Yai area due to existing outdoor advertisements (OAs) which reportedly contribute to visual pollution. This study thus aims to evaluate: (1) which OA attributes contribute to visual pollution, (2) which personal factors affect perception of visual pollution, and (3) to what extent visual pollution occurs in certain areas. The evaluation integrates Intervisibility Analysis which uses Space Syntax technique to predict accessibility and Perception Assessment which encompasses personal factors and OA attributes. Questionnaires are collected at the designated points located every 50 meters for spatial interpolation. Inferential statistical analyses are also conducted. 4 out of 8 OA attributes significantly contribute to visual pollution: (1) material/texture, (2) size/proportion, (3) altitude, and (4) content. Origin and frequency of access are personal factors significantly correlated with perception of visual pollution caused by OAs. Therefore, urban planning measures should be enacted to regulate the OA attributes, according to intervisibility level of certain areas.
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Integration of Intervisibility and Perception Assessment to Evaluate Spatial Visual Pollution from Outdoor Advertisements: A Case Study of Wongwian Yai