Open Datasets
Open Soil Nutrient Datasets — Murcia, Spain
Siora publishes open-access soil nutrient maps for the Murcia region of Spain, built for agricultural research, land management, and geospatial analysis. The datasets cover five core soil parameters — nitrogen, phosphorus, potassium, organic carbon, and pH — for 2000, 2010, and 2020.
Nutrient concentrations are estimated across the whole region from multispectral satellite observations combined with climate, terrain, geological, and soil reference data — no in-field sampling involved. Each dataset ships with a GeoTIFF nutrient map, a colourized PNG heatmap, and a preview thumbnail, all released under Creative Commons Attribution 4.0 International (CC-BY 4.0) — free to share and reuse with attribution.
Method summary
These maps come from Siora's calibrated spectral analysis pipeline: multispectral imagery is corrected for atmospheric and terrain effects, then combined with auxiliary topographic, climate, geological, and soil-texture data to cut down noise and sharpen predictions. The cleaned spectral signal is compared against nutrient-specific spectral signatures to estimate concentration pixel by pixel — a repeatable, scalable way to map nutrients across a whole region without physical sampling, and one that supports comparisons across time.
Technical details
| Field | Value |
|---|---|
| Geographic coverage | Murcia region, Spain |
| Available years | 2000, 2010, 2020 |
| Nutrients | Nitrogen (N), Phosphorus (P), Potassium (K), Organic Carbon (OC), pH |
| Spatial resolution | 30 metres |
| Formats provided | GeoTIFF (.tif), PNG heatmap, PNG thumbnail |
| Units | N/P/K in mg/kg, OC in g/kg, pH in pH units |
| License | Creative Commons BY 4.0 |
Laboratory method equivalents
Estimates are calibrated to be comparable with these standard laboratory extraction and measurement methods:
| Nutrient | Standard |
|---|---|
| Nitrogen | ISO 11261 (Kjeldahl method) |
| Phosphorus | ISO 11263 (Olsen P method) |
| Potassium | USDA–NRCS NH₄OAc extraction |
| Organic Carbon | ISO 10694 (dry combustion) |
| pH | ISO 10390 (pH in water) |
Suggested uses
- •Tracking long-term changes in soil fertility
- •Benchmarking nutrient distribution for agricultural planning
- •Benchmarking and validation of remote sensing and agronomic methods
- •Cross-comparison with national soil survey data
- •Environmental and sustainability research
Citation & DOI
This dataset is permanently archived on Zenodo. Please cite as:
Siora (2025). Murcia Soil Nutrient Dataset (2000–2020). Zenodo.https://doi.org/10.5281/zenodo.16889684
Permanent DOI: 10.5281/zenodo.16889684
Dataset downloads
| Year | Nutrient | Download |
|---|---|---|
| 2000 | Nitrogen (mg/kg) | Download |
| 2000 | Phosphorus (mg/kg) | Download |
| 2000 | Potassium (mg/kg) | Download |
| 2000 | Organic Carbon (g/kg) | Download |
| 2000 | pH (pH units) | Download |
| 2010 | Nitrogen (mg/kg) | Download |
| 2010 | Phosphorus (mg/kg) | Download |
| 2010 | Potassium (mg/kg) | Download |
| 2010 | Organic Carbon (g/kg) | Download |
| 2010 | pH (pH units) | Download |
| 2020 | Nitrogen (mg/kg) | Download |
| 2020 | Phosphorus (mg/kg) | Download |
| 2020 | Potassium (mg/kg) | Download |
| 2020 | Organic Carbon (g/kg) | Download |
| 2020 | pH (pH units) | Download |