Siora Open Soil Nutrient Dataset – Murcia, Spain (2000, 2010, 2020)

This dataset provides regional-scale direct estimates of soil nutrient properties across Spain’s Region of Murcia at ~30 m spatial resolution. It includes three time slices (2000, 2010, and 2020) with coverage of five key soil parameters: Nitrogen (N), Phosphorus (P), Potassium (K), Organic Carbon (OC), and pH. Values were derived using calibrated reflectance spectroscopy applied to multispectral satellite observations. Terrain, climatic, and geological datasets were incorporated to minimize noise and strengthen the nutrient-specific signal. Each parameter is distributed as a single-band GeoTIFF (compressed into ZIP archives), with additional preview images for quick inspection. Reference laboratory methods for comparability include: - Nitrogen – ISO 11261:1995 (Modified Kjeldahl) - Phosphorus – ISO 11263:1994 (Spectrometric) - Potassium – USDA–NRCS (NH₄OAc extraction + AAS) - Organic Carbon – ISO 10694:1995 (Dry combustion) - pH – ISO 10390:2005 (Glass electrode) The Murcia release forms part of a broader open dataset series curated by Siora, covering multiple countries and regions. Intended applications include monitoring of nutrient dynamics, supporting precision agriculture workflows, environmental research, and as training data for geospatial or ML models.