EVALUATION OF SAR/SENTINEL-1 IMAGES FOR IDENTIFICATION OF GOLD MINING VESSELS BASED ON VESSEL DETECTION ALGORITHMS
DOI:
https://doi.org/10.14393/RCG259869530Keywords:
SAR images, Artisanal and small-scale gold mining in rivers, Constant False Alarm Rate algorithmAbstract
Artisanal and Small-Scale Gold in Brazil can be conducted on dry land or riverbeds. In this context, Artisanal and Small-Scale Gold mining vessels dredge sediment from the riverbeds to extract gold using heavy machinery. Synthetic Aperture Radar (SAR) imagery for detecting these vessels has been gaining prominence due to the availability of higher quality images with better temporal resolution and less influence from atmospheric factors, allowing their use in areas with dense cloud cover. Given the absence of specific techniques for detecting gold mining vessels, SAR imagery methods present themselves as an alternative. Therefore, this study aimed to identify gold mining vessels on the Madeira River in Porto Velho using seven Sentinel-1 images from 2018 to 2021, employing Constant False Alarm Rate (CFAR) and geometric evaluation algorithms. The results generated F1 scores from 0.76 to 0.86, with an average detection rate of 89.7% and an omission rate of 10.3%. Gold mining vessels were also identified in legal and potentially illegal areas. Thus, this study can provide valuable information for regulatory agencies to optimize their efforts in overseeing this activity.
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Copyright (c) 2024 Diego Henrique Costa Pereira, Roberto Arnaldo Trancoso Gomes, Osmar Abílio de Carvalho Júnior, Renato Fontes Guimarães

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