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README.md

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+---
+pretty_name: EEA Waterbase Optics5 — Cleaned River Measurements (2015–2017)
+license: other
+license_name: eea-reuse-policy
+license_link: https://www.eea.europa.eu/en/legal-notice
+language:
+  - en
+tags:
+  - water-quality
+  - environmental
+  - eea
+  - wise
+  - eu
+  - hydrology
+  - sentinel-2
+  - remote-sensing
+  - river
+size_categories:
+  - 100K<n<1M
+---
+
+# EEA Waterbase Optics5 — Cleaned River Measurements (2015–2017)
+
+Filtered and cleaned subset of the [EEA Waterbase – Water Quality ICM (WISE-4) v2018.1](https://huggingface.co/datasets/cassini-team-todo/eea-waterbase) prepared for training Sentinel-2 water quality models.
+
+Produced during the **11th CASSINI Hackathon – EU Space for Water**.
+
+## Filtering criteria
+
+- **Water body category**: rivers only (`parameterWaterBodyCategory = RW`)
+- **Station coordinates**: stations must have valid `lon` and `lat`
+- **Date window**: 2015-07-01 – 2017-12-31 (aligned with Sentinel-2A availability)
+- **Determinands (Optics5)**: five parameters with the strongest expected link to Sentinel-2 surface reflectance
+
+| Code | Parameter | Unit |
+|---|---|---|
+| `EEA_3133-01-5` | Dissolved oxygen | mg{O2}/L |
+| `EEA_3131-01-9` | Oxygen saturation | % |
+| `CAS_14797-55-8` | Nitrate | mg{NO3}/L |
+| `CAS_14798-03-9` | Ammonium | mg{NH4}/L |
+| `CAS_14265-44-2` | Phosphate-P | mg{P}/L |
+
+## Files
+
+### `measurements_optics5_long.parquet`
+Long-format table of all individual measurements. One row per (station, sampling date, determinand).
+
+| Column | Description |
+|---|---|
+| `station_id` | Monitoring site identifier |
+| `lat`, `lon` | Station coordinates (WGS84) |
+| `sampling_date` | Date of measurement |
+| `determinand_code` | One of the Optics5 codes above |
+| `value` | Observed value (numeric) |
+| `unit` | Unit of measurement |
+| `below_loq` | Flag: value is below limit of quantification |
+| `loq_value` | Limit of quantification value |
+
+**4,757 stations · 251,245 rows · 2015-07-01 to 2017-12-31**
+
+Determinand breakdown:
+
+| Code | Rows | Stations |
+|---|---|---|
+| `EEA_3133-01-5` | 32,330 | 3,594 |
+| `EEA_3131-01-9` | 33,301 | 3,163 |
+| `CAS_14797-55-8` | 63,488 | 3,641 |
+| `CAS_14798-03-9` | 65,025 | 3,495 |
+| `CAS_14265-44-2` | 57,101 | 3,122 |
+
+### `station_index_optics5.parquet`
+One row per eligible station with summary statistics.
+
+| Column | Description |
+|---|---|
+| `station_id` | Monitoring site identifier |
+| `lat`, `lon` | Station coordinates (WGS84) |
+| `first_date` | Earliest measurement date in window |
+| `last_date` | Latest measurement date in window |
+| `n_measurements` | Total number of non-null value rows |
+| `n_determinands` | Number of distinct Optics5 codes measured |
+
+**4,757 rows**
+
+### `station_year_coverage_optics5.parquet`
+Audit table: number of measurements per station, year, and determinand code.
+
+| Column | Description |
+|---|---|
+| `station_id` | Monitoring site identifier |
+| `year` | Calendar year |
+| `determinand_code` | Optics5 determinand code |
+| `n_measurements` | Number of measurements in that year |
+
+**33,419 rows**
+
+## Intended use
+
+Each training sample for a Sentinel-2 model is a `(station, date)` pair joined to the nearest cloud-free Sentinel-2 scene within a ±N day window. Separate models (or a multitask model with target masking) are trained per determinand — co-presence of all five codes on the same date is not required.
+
+## Source
+
+Derived from `cassini-team-todo/eea-waterbase` (mirror of EEA Waterbase WISE-4 v2018.1).
+Original data © European Environment Agency, reused under the [EEA reuse policy](https://www.eea.europa.eu/en/legal-notice).

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