Language：Japanese   Publisher：Marine Pollution Bulletin  

In the context of marine litter monitoring, reporting the weight of beached litter can contribute to a better understanding of pollution sources and support clean-up activities. However, the litter scaling task requires considerable effort and specific equipment. This experimental study proposes and evaluates three methods to estimate beached litter weight from aerial images, employing different levels of litter categorization. The most promising approach (accuracy of 80 %) combined the outcomes of manual image screening with a generalized litter mean weight (14 g) derived from studies in the literature. Although the other two methods returned values of the same magnitude as the ground-truth, they were found less feasible for the aim. This study represents the first attempt to assess marine litter weight using remote sensing technology. Considering the exploratory nature of this study, further research is needed to enhance the reliability and robustness of the methods.

DOI： 10.1016/j.marpolbul.2024.116405

Scopus

PubMed

Language：Japanese   Publisher：Marine Pollution Bulletin  

Multirotor drones can be efficiently used to monitor macro-litter in coastal and riverine environments. Litter on beaches, dunes and riverbanks, along with floating litter on coastal and river waters, can be spotted and mapped from aerial drone images. Items detection and classification are prone to image resolution, which is expressed in terms of Ground Sampling Distance (GSD). The GSD is determined by drone flight altitude and camera properties. This paper investigates what is a suitable GSD value for litter survey. Drone flight altitude and camera setup should be chosen to obtain a GSD between 0.5 cm/px and 1.25 cm/px. Within this range, the lowest GSD allows litter categorization and classification, whereas the highest value should be adopted for a coarser litter census. In the vision of drawing up a global protocol for drone-based litter surveys, this work sets the ground for homogenizing data collection and litter assessments.

DOI： 10.1016/j.marpolbul.2023.115521

Scopus

PubMed

Language：English  

DOI： 10.1016/j.dib.2023.109176

PubMed

Language：Japanese   Publisher：Coastal Oceanography Research Committee, the Oceanographic Society of Japan  

DOI： 10.32142/engankaiyo.2023.8.004

Language：English  

DOI： 10.1016/j.dib.2022.108072

PubMed