Data sources & attribution
Introvert Maps is built on open data. This page credits every upstream dataset with its licence and the attribution it requires. We take attribution seriously — the same credits appear in the app’s About screen.
Map, elevation & rendering
| Source | Used for | Licence & attribution |
|---|
| OpenStreetMap |
All base map data (trails, roads, water, land, places, peaks) |
ODbL (Open Database License). © OpenStreetMap contributors. Attribution and share-alike apply to derived databases; extracts via Geofabrik. |
| OpenMapTiles |
Vector basemap schema |
Schema CC-BY; tiles built with Planetiler. |
| Copernicus GLO-30 DEM |
Elevation used to pre-bake contour lines and slope shading |
Copernicus / ESA — free to use including commercially, with attribution. © Copernicus DEM. |
| Natural Earth |
Worldwide place context |
Public domain. |
| Wikidata |
Notable peaks & landmarks |
CC0 (public domain dedication). |
| Noto Sans |
Map label fonts |
SIL Open Font License. |
Routing
| Source | Used for | Licence & attribution |
|---|
| BRouter |
On-device offline route planning (engine + profiles) |
Open source (MIT). Routes are computed from OpenStreetMap data (ODbL, above). |
Weather & alerts
| Source | Used for | Licence & attribution |
|---|
| Open-Meteo |
Local weather forecasts (and a flood-data fallback) |
The underlying weather models (DWD, NOAA, ECMWF and others) are open. Open-Meteo’s free API tier is for non-commercial use; because the app is currently free, this use is compliant. We will revisit the commercial terms if and when the app is monetized. Data attributed to Open-Meteo and the originating weather services. |
| MeteoAlarm |
Official severe-weather warnings across Europe |
Warnings issued by national meteorological services, aggregated by EUMETNET/MeteoAlarm; attribution to the issuing service. |
| US National Weather Service (NWS) |
Severe-weather warnings in the United States |
U.S. Government public domain. |
River & water levels
| Source | Country | Attribution required |
|---|
| IMGW-PIB | Poland | Źródło danych: IMGW-PIB |
| WSV / PEGELONLINE | Germany | Datenquelle: WSV / PEGELONLINE |
| Rijkswaterstaat (WaterWebservices) | Netherlands | Bron: Rijkswaterstaat WaterWebservices |
| ČHMÚ | Czechia | Zdroj dat: ČHMÚ |
| Open-Meteo Flood / Copernicus GloFAS | Fallback | GloFAS is Copernicus (free, commercial use with attribution); accessed via the Open-Meteo free tier, whose non-commercial caveat above applies while the app is free. |
Light pollution
| Source | Used for | Licence & attribution |
|---|
| VIIRS night-lights (NASA/NOAA) |
The approximate-darkness overlay |
Public domain (U.S. Government). Presented as an approximate darkness proxy, not a calibrated Bortle scale. |
Transit timetables & live delays
Each national rail timetable and city bundle is built from that network’s official open GTFS feed; live delays come from the country’s public GTFS-RT feed. Several feeds require attribution; a couple carry share-alike or other constraints, noted below.
| Network | Feed / operator | Licence & attribution |
|---|
| Netherlands | OVapi | Open. |
| Germany | gtfs.de / DELFI | Open. |
| Poland | mkuran.pl | Open. |
| Czechia | spojenka.cz (CIS JŘ conversion) | Open. |
| France | SNCF / transport.data.gouv.fr | Licence Ouverte (Etalab); attribution. |
| Slovakia | ŽSR / ZSSK | CC0. |
| Italy (central-north) | Regione Toscana | Open; attribution. |
| Great Britain | National Rail Enquiries (rail); TfL (London) | Powered by National Rail Enquiries; Powered by TfL Open Data, distributed via Transitland. |
| Spain | Renfe | Open; attribution. |
| Belgium | SNCB / iRail | Open; attribution. |
| Luxembourg | CFL | Open. |
| Ireland | NTA / Transport for Ireland | CC BY 4.0; attribution. |
| Norway | Entur | NLOD; attribution. |
| Finland | VR / Digitraffic | CC BY 4.0; attribution. |
| Portugal | CP | Open. |
| Croatia | HŽPP | Open. |
| Switzerland | opentransportdata.swiss / SBB | Open; attribution. |
| United States | Amtrak | Open. |
The live provider list on the supported transit providers page is generated directly from the app’s catalogue, so it always matches what ships today.
Open-source software
- MapLibre Native — the vector map render engine (BSD 2-Clause).
- BRouter — offline route planning (MIT).
- Planetiler — the tile builder.
- d3-celestial — star & constellation data by Olaf Frohn (BSD); stars from XHIP (Anderson & Francis, 2012).
Using the app’s data
These datasets are downloaded and used on your device for your own navigation — they are not resold as a dataset. When you share content derived from them, please carry the attributions above (in particular “© OpenStreetMap contributors” and each transit feed’s required credit). See our Terms for details.