Data sources & licences

All readings come from official open data. Every value shows its source and time. Licences verified 2026-10-19

Source	Used for	Licence	Update frequency	Licence last verified
PEGELONLINE (WSV)	Water level, discharge, water temperature	DL-DE Zero 2.0	every 15 minutes	2026-10-18
European Environment Agency – Bathing Water Directive	Bathing water quality (season 2025)	CC BY 4.0	yearly	2026-10-18
Deutscher Wetterdienst (DWD) Open Data	Monthly areal precipitation	CC BY 4.0	monthly	2026-10-18
OpenStreetMap	Base map; canoe put-ins, slipways, marinas, locks (Geofabrik extract; derived database openly available at /api/pois.json under ODbL)	ODbL 1.0	monthly	2026-10-18
Wikidata	River encyclopedia: length, drainage basin, source, mouth, countries, coordinates, names	CC0	one-off, reviewed monthly	2026-10-19

Map tiles: OpenFreeMap / OpenMapTiles based on OpenStreetMap. Every source is checked for licence, terms and robots.txt before use and monthly afterwards.

Readings are raw WSV data and may be revised. Status uses the official MNW, MHW and HSW values from PEGELONLINE. Data is cleaned by script only (no AI); future timestamps are discarded and the fetch time is never used as measurement time.

Linked but not republished: ELWIS (notices to skippers).