Satellite object-based classification maps for placer occurrence from Ria de Vigo (Spain) pilot site
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Identification Full Title Satellite object-based classification maps for placer occurrence from Ria de Vigo (Spain) pilot site Abstract Satellite object-based classification maps for placer occurrence in the Ria de Vigo (Spain) pilot site provide high-resolution delineation of coastal sediment deposits rich in critical raw materials (CRMs). Based on WorldView-3 imagery and Object-Based Image Analysis (OBIA), three classification methods were implemented: Single-Level (SVM-based, 89.9–93.3% accuracy), Multi-Level (hierarchical segmentation, 94.0–94.6% accuracy), and Dynamic Classification (rule-based, 91.0–94.9% accuracy). Validation was performed using UAV orthomosaics, field control points, and spectral reference data. These vector maps enhance coastal mineral exploration and environmental monitoring by providing accurate, spatially contextualized mapping of heavy mineral accumulations. Keywords Object-Based Image Analysis (OBIA), WorldView-3, heavy mineral mapping, placer deposit exploration, high-resolution remote sensing, coastal mineral exploration, machine learning, Ria De Vigo Pilot area Ria De Vigo Associated resources Language English URL Categories Earth Observation, Mineral Exploration, Remote Sensing, Geology Temporal reference Creation date (dd.mm.yyyy) 13.03.2024 Revision date (dd.mm.yyyy) 30.06.2025 Quality and validity Classification accuracy up to 94.96% (validated with UAV and field samples) Representation type Vector Format ESRI Shapefile Lineage Derived from WorldView-3 imagery using Object-Based Image Analysis (OBIA) in eCognition 10.3. Processing includes segmentation, custom spectral indices (e.g., Ilmenite Absorption, Grossular++), and rule-based classification. Classification accuracy up to 94.96% (validated with UAV and field samples) Spatial resolution Minimum mapping unit: 0.4 m² (reflecting <5 m placer occurrences) Positional accuracy ≤2 meters Maintenance information Not planned (static dataset supporting final classification output for the pilot study) Coordinate system EPSG: 32629, Constraints related to access and use Use limitation For research and non-commercial use in mineral exploration. Attribution required Access constraint Open access under appropriate license (e.g., CC-BY 4.0) Public/Private Public Responsible organisation Hellenic Survey of Geology and Mineral Exploration (HSGME) Responsible Contact Dr. Irene Zananiri izananiri@eagme.gr Responsible Party HSGME Metadata on metadata Contact Dr. Irene Zananiri izananiri@eagme.gr Metadata language English
