Detection of plastic pollution in Rasau river using UAV imageries: An object-based classification approach

Unmanned aerial vehicles (UAVs) have recently been suggested as a swift, simple to replicate, and economical way to monitor macro litter. High-resolution UAV imageries were utilised to create ways to identify plastic debris drifting in the river as the initial step in this research. The object-based...

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Bibliographic Details
Main Authors: Haris, Nur Daniza, Said, Mohd Shahmy Mohd, Rasam, Abdul Rauf Abdul, Ali, Tengku Afrizal Tengku, Razali, Raiz
Format: Conference Proceeding
Language:English
Subjects:
Accuracy
Altitude
Classification
Flight
Image resolution
Plastic pollution
Unmanned aerial vehicles
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Summary:Unmanned aerial vehicles (UAVs) have recently been suggested as a swift, simple to replicate, and economical way to monitor macro litter. High-resolution UAV imageries were utilised to create ways to identify plastic debris drifting in the river as the initial step in this research. The object-based classification method was used to detect the occurrence of plastic pollution in the Rasau River. This study consists of three objectives; i) to review the use of UAV imageries to detect any form of plastics pollution along Rasau River ii) to examine the visibility of plastics pollution, and iii) to identify the suitable altitude that was used, and effectively visualise the plastic pollution phenomena. The study used two flying altitudes, which are 50 m and 80 m. The data were processed in pix4D Mapper and ArcGIS Pro software. The results of distribution in the identified plastic pollution were presented on maps. The accuracy assessment for this study was made by presenting the final output data for both altitudes. Based on the results, the overall accuracy for 50 m altitude is 92% with 0.881 kappa statistic, while for the 80 m, the overall accuracy of the output is 90% and 0.859 kappa statistic. Meanwhile, the accuracy of plastic pollution at 50 m altitude was 85%, and 80 m was 63%, which showed a significant difference in accuracy percentage. Furthermore, the area covered by plastic pollution at 50 m altitude was 1525.87 m² was greater than 221.38 m² for the 80 m altitude. There was a significant difference in the resulting imageries captured in these two flying altitudes.
ISSN:0094-243X
1551-7616
DOI:10.1063/5.0168024