Seagrass meadows are crucial blue-carbon habitats, and mapping their extent is a prerequisite for coastal management and carbon inventory. Optical satellite sensors cover large areas but cannot reach deep or turbid water, whereas side-scan sonar (SSS) images the seabed at high resolution and at any depth. Interpreting...
Hayat Rajani, Nuno Gracias, Rafael Garcia· 0 citations
A physics-informed self-distillation framework built upon the DINOv3 architecture utilizing a ConvNeXt-v2-Tiny backbone to maximize data efficiency and enforces view-invariance, and proposes a dense, hierarchical feature fusion strategy across all four network stages to preserve fine-grained sediment details alongside...
Taqi Hamoda, Hayat Rajani, Nuno Gracias· 0 citations
This method utilizes Structure-from-Motion to reconstruct a dense 3D seafloor mesh, acting as a geometric anchor between the visual and acoustic domains, and applies an inverse Lambertian model and a dual-Gaussian weighting function to isolate the intrinsic seabed reflectivity.
Side-scan sonar (SSS) mosaicking plays a crucial role in large-scale seabed mapping but is challenged by complex nonlinear, spatially varying distortions due to diverse sonar acquisition conditions. Existing rigid or affine registration methods fail to model such complex deformations, whereas traditional nonrigid techn...
Can Lei, Nuno Gracias, Rafael Garcia et al.· IEEE Transactions on Geoscie...· 0 citations
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