Quelle: http://innschifffahrt.antonprock.at/inn.htm
Quelle: Periphrastika.
Based on data provided by OpenStreetMap contributors (https://www.openstreetmap.org),
Digital Terrain Model of Austria (www.data.gv.at),
Bayerische Vermessungsverwaltung DGM1 (https://geodaten.bayern.de/opengeodata) ,
ASTER Digital Elevation Model data by https://lpdaac.usgs.gov/,
and results of own runoff calculations.