Coastal spectral library of beach sand and rocks from Ria de Vigo (Spain) pilot site

Abstract Coastal spectral library of beach sand and rocks from the Ria de Vigo, Spain. The spectral library focuses on analysed beach sand samples and their respective heavy mineral concentrates. Selected samples from rock outcrops on the beaches were also included. This depository contains data generated within the European S34 project. [Under construction] Data is currently being curated and updated. The dataset will be made public once the process is finalized. Data acquisition and processing Spectral data were acquired at the Institute of Earth Sciences (University of Porto) using a FieldSpec 4 standard resolution spectroradiometer (ASD Inc., Boulder, CO, USA), covering the 400 to 2500 nm spectral range with three sensors (two for SWIR, and one for VNIR). The spectral acquisition was conducted in a dark room after ensuring the three sensors of the equipment were at the same temperature (after heating for 30 min). The equipment has a Contact Probe with an internal light source provided by a halogen bulb and a spot size of 10mm that was used for taking the measurements.First, the normalization was made using perfect albidum (withe plate) with reflectance equal to 1. The samples were positioned in a Petri dish, and the spectra were collected. All spectra consisted of the average of five measurements taken at the same spot in the sample.Each raw spectrum measurement was normalized using the continuum removal technique [1].Reference: 1. Ng-Cutipa, W. L.; Lobato, A.; González, F. J.; Georgalas, G. P.; Zananiri, I.; Carvalho, M.; Cardoso-Fernandes, J.; Somoza, L.; Piña, R.; Lunar, R.; et al. Spectral Angle Mapper Application Using Sentinel-2 in Coastal Placer Deposits in Vigo Estuary, Northwest Spain. Remote Sensing 2025, 17 (11), 1824. doi:10.3390/rs17111824 Metadata information Identification Full Title Coastal spectral library of beach sand and rocks from Ria de Vigo (Spain) pilot site Abstract Coastal spectral library of beach sand and rocks from the Ria de Vigo, Spain. The spectral library focuses on analysed beach sand samples and their respective heavy mineral concentrates. Selected samples from rock outcrops on the beaches were also included. Keywords Spectral library; Reflectance spectroscopy; Coastal placers; Mineral concentrates; Beach; Rock Pilot area Ria de Vigo (Spain) Associated resources Language English URL Categories Spectral library Temporal reference Creation date (dd.mm.yyyy) 25.06.2025 Revision date (dd.mm.yyyy) Quality and validity Representation type Text file Format *.csv, *.txt Lineage Spatial resolution Positional accuracy Maintenance information Dataset under construction: data is currently being curated and updated. Coordinate system Constraints related to access and use Use limitation None Access constraint Temporary Public/Private Private The dataset will be made public once the curation process is finalized. Responsible organisation Responsible Contact Joana Cardoso Fernandes | [e-mail] Responsible Party UPORTO Metadata on metadata Contact Joana Cardoso Fernandes | [e-mail] Metadata language English