{"type": "FeatureCollection", "features": [{"id": "10.5281/zenodo.16889685", "type": "Feature", "geometry": null, "properties": {"updated": "2026-05-25T16:23:04Z", "type": "Dataset", "title": "Siora Open Soil Nutrient Dataset \u2013 Murcia, Spain (2000, 2010, 2020)", "description": "This dataset provides regional-scale direct estimates of soil nutrient properties across Spain\u2019s 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. \u00a0  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. \u00a0  Reference laboratory methods for comparability include: \u00a0- Nitrogen \u2013 ISO 11261:1995 (Modified Kjeldahl) \u00a0- Phosphorus \u2013 ISO 11263:1994 (Spectrometric) \u00a0- Potassium \u2013 USDA\u2013NRCS (NH\u2084OAc extraction + AAS) \u00a0- Organic Carbon \u2013 ISO 10694:1995 (Dry combustion) \u00a0- pH \u2013 ISO 10390:2005 (Glass electrode) \u00a0  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.", "keywords": ["soil", " Murcia", " Spain", " nitrogen", " phosphorus", " potassium", " organic carbon", " pH", " geotiff", " 30 m resolution", " agriculture", " remote sensing", " spectroscopy"], "contacts": [{"organization": "Siora.ai", "roles": ["creator"]}]}, "links": [{"href": "https://doi.org/10.5281/zenodo.16889685"}, {"rel": "self", "type": "application/geo+json", "title": "10.5281/zenodo.16889685", "name": "item", "description": "10.5281/zenodo.16889685", "href": "https://repository.soilwise-he.eu/cat/collections/metadata:main/items/10.5281/zenodo.16889685"}, {"rel": "collection", "type": "application/json", "title": "Collection", "name": "collection", "description": "Collection", "href": "https://repository.soilwise-he.eu/cat/collections/metadata:main"}], "time": {"date": "2025-08-17T00:00:00Z"}}, {"id": "10.5281/zenodo.16889567", "type": "Feature", "geometry": null, "properties": {"updated": "2026-05-25T16:23:04Z", "type": "Dataset", "title": "Siora Open Soil Nutrient Dataset \u2013 Ukraine (2000, 2010, 2020)", "description": "This dataset contains direct satellite-derived estimates of soil nutrient properties for Ukraine at ~250 m resolution, covering the years 2000, 2010, and 2020. Variables include Nitrogen (N), Phosphorus (P), Potassium (K), Organic Carbon (OC), and pH. \u00a0  The data are derived from multispectral reflectance spectroscopy, corrected with topographic, climatic, and geological auxiliary datasets to isolate nutrient signatures. Each variable is provided as a single-band GeoTIFF (zipped), with accompanying PNG heatmaps, thumbnails, README, metadata JSON, and CC-BY 4.0 license. \u00a0  Comparable laboratory references: \u00a0- pH \u2013 ISO 10390:2005 (Glass electrode) \u00a0- Nitrogen \u2013 ISO 11261:1995 (Modified Kjeldahl) \u00a0- Phosphorus \u2013 ISO 11263:1994 (Spectrometric determination) \u00a0- Potassium \u2013 USDA\u2013NRCS (Atomic absorption after NH\u2084OAc extraction) \u00a0- Organic Carbon \u2013 ISO 10694:1995 (Dry combustion) \u00a0  Suggested uses: nutrient trend analysis, soil health monitoring, precision agriculture benchmarking, model training and validation.", "keywords": ["soil", " nitrogen", " phosphorus", " potassium", " organic carbon", " pH", " Ukraine", " agriculture", " remote sensing", " geotiff", " spectroscopy", " open data"], "contacts": [{"organization": "Siora, Radev, Velin,", "roles": ["creator"]}]}, "links": [{"href": "https://doi.org/10.5281/zenodo.16889567"}, {"rel": "self", "type": "application/geo+json", "title": "10.5281/zenodo.16889567", "name": "item", "description": "10.5281/zenodo.16889567", "href": "https://repository.soilwise-he.eu/cat/collections/metadata:main/items/10.5281/zenodo.16889567"}, {"rel": "collection", "type": "application/json", "title": "Collection", "name": "collection", "description": "Collection", "href": "https://repository.soilwise-he.eu/cat/collections/metadata:main"}], "time": {"date": "2025-08-17T00:00:00Z"}}], "links": [{"rel": "self", "type": "application/geo+json", "title": "This document as GeoJSON", "href": "https://repository.soilwise-he.eu/cat/collections/metadata:main/items?keywords=+geotiff&f=json", "hreflang": "en-US"}, {"rel": "alternate", "type": "text/html", "title": "This document as HTML", "href": "https://repository.soilwise-he.eu/cat/collections/metadata:main/items?keywords=+geotiff&f=html", "hreflang": "en-US"}, {"rel": "collection", "type": "application/json", "title": "Collection URL", "href": "https://repository.soilwise-he.eu/cat/collections/metadata:main", "hreflang": "en-US"}, {"type": "application/geo+json", "rel": "first", "title": "items (first)", "href": "https://repository.soilwise-he.eu/cat/collections/metadata:main/items?keywords=+geotiff&", "hreflang": "en-US"}, {"rel": "last", "type": "application/geo+json", "title": "items (last)", "href": "https://repository.soilwise-he.eu/cat/collections/metadata:main/items?keywords=+geotiff&offset=2", "hreflang": "en-US"}], "numberMatched": 2, "numberReturned": 2, "distributedFeatures": [], "timeStamp": "2026-05-26T06:20:42.552802Z"}