cassini-team-todo/eea-waterbase-cleaned

EEA Waterbase Optics5 — Cleaned River Measurements (2015–2017)

Filtered and cleaned subset of the EEA Waterbase – Water Quality ICM (WISE-4) v2018.1 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

station_river_bboxes.geoparquet

Primary spatial file for model training. One row per station matched to its nearest HydroRIVERS segment. The geometry is a ~5 km corridor polygon that follows the river shape — suitable as a Sentinel-2 query window with the station at the midpoint.

Construction:

1. Each station is snapped onto its nearest HydroRIVERS segment (max 5 km)
2. All connected river geometry within 2.5 km of the snap point is merged into a continuous linestring
3. A 5 km sub-segment centred on the snap point is extracted (2.5 km each direction)
4. The segment is buffered 300 m each side → corridor polygon in WGS-84

Column	Description
station_id	Monitoring site identifier
lat, lon	Original station coordinates (WGS84)
first_date	Earliest measurement date in window
last_date	Latest measurement date in window
n_measurements	Total number of measurements
n_determinands	Number of distinct Optics5 codes measured
HYRIV_ID	Matched HydroRIVERS segment ID
MAIN_RIV	HydroRIVERS main-river ID
snap_dist_m	Distance from station to the river line (metres)
geometry	Corridor polygon (Polygon, WGS84) following the river shape
bbox_west/south/east/north	Envelope coordinates of the corridor for Sentinel Hub API calls

4,742 stations (15 dropped — farther than 5 km from any river)

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. The corridor polygon in station_river_bboxes.geoparquet defines the spatial extent of the Sentinel-2 query — pass bbox_west/south/east/north directly to the Sentinel Hub Statistical API. 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).
River network from cassini-team-todo/hydro-rivers-europe (HydroRIVERS v1.0).
Original data © European Environment Agency, reused under the EEA reuse policy.