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Field Study of Detection of Macroplastic Waste in Urban Rivers Using Unmanned Aerial Vehicles (UAV): Case Study in Makassar, Indonesia 1Graduate Programs in Environmental Systems, Graduate School of Environmental Engineering, The University of Kitakyushu, Kitakyushu, 808-0135, Japan Abstract Macroplastics are a global threat to the aquatic environment. It is important to find and monitor the presence of macroplastics in waters such as densely populated urban rivers, which are potentially harmful to the river environment and can flow into the oceans. UAV imaging is a fast method for obtaining visual data of floating plastic waste. In this study, we conducted a field assessment to detect macroplastic floating on the surface of the river using a UAV with several altitude trials to find the best image detection resolution. The survey method used is Aerial mapping which is processed automatically. The next process is a mosaic of all data to be used as a georeferenced orthophoto using the Agisoft Photoscan software. The results showed that macroplastic was still clearly visible at a height of 15 m, but the best image performance was at an altitude of 10 m. The most recommended aerial mapping altitude is 15 m to avoid flying obstacles in congested urban river locations. The recommended time is in sunny weather at 08.00-10.00 am and 14.00-16.00 pm to avoid shadows and reflections of the sun, this applies to trials in tropical areas such as Indonesia. Keywords: Keyword: Macroplastic, UAV, Urban River, Indonesia Topic: Sustainable Cities |
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