Open Soil Nutrient Datasets – Murcia, Spain

Siora provides open-access soil nutrient maps for the Murcia region of Spain, designed for agricultural research, land management, and geospatial analysis. The datasets cover five essential soil parameters — nitrogen (N), phosphorus (P), potassium (K), organic carbon (OC), and pH — for the years 2000, 2010, and 2020.

Using multispectral satellite observations in combination with climate, terrain, geological, and soil reference data, we estimate nutrient concentrations across the entire Murcia region without the need for in-field sampling. Each dataset includes a GeoTIFF nutrient map, a colorized PNG heatmap, and a thumbnail image for quick preview.

All files are released under the Creative Commons Attribution 4.0 International (CC-BY 4.0) license, enabling unrestricted sharing and reuse with proper attribution.

Method Summary

These datasets are produced using Siora’s calibrated spectral analysis workflow. Multispectral satellite images are corrected for atmospheric conditions and terrain effects. Auxiliary datasets — including topography, climate normals, geological layers, and soil texture — are used to reduce noise and improve prediction accuracy.

The processed spectral data is then compared against nutrient-specific spectral signatures to estimate concentrations in each pixel.

This method allows repeatable, scalable nutrient mapping without physical soil sampling, enabling temporal comparisons and large-area soil monitoring.

Technical Details

• Geographic coverage: Murcia region, Spain
• Available years: 2000, 2010, 2020
• Nutrients: Nitrogen (N), Phosphorus (P), Potassium (K), Organic Carbon (OC), pH
• Spatial resolution: 30 meters
• Formats provided: GeoTIFF (.tif), PNG heatmap, PNG thumbnail
• Units:
• Nitrogen, Phosphorus, Potassium – mg/kg
• Organic Carbon – g/kg
• pH – pH units
• License: Creative Commons BY 4.0

Laboratory Method Equivalents

Our nutrient estimates are comparable to the following standard laboratory soil extraction and measurement methods:

• 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 Download Table