Data & Licenses

About Japanese readings

For station, bus-stop, and route names, we prioritize official information published by transit operators and municipalities.

When an official reading cannot be found, we may consult dictionaries. To avoid displaying an incorrect reading, names whose readings cannot be confirmed are shown exactly as they appear in the source data.

The providers and licenses for the data and dictionaries used by the app are listed below.

Base data sources

Sources of route colors

• Colors based on official operator materials: 33 routes
• GTFS route_color: 3,568 routes
• Generated identification colors where no color is published: 4,366 routes

The N02 and N07 National Land Numerical Information datasets do not include route colors. Only colors confirmed in official materials or GTFS are treated as official.

Processing performed by the app

• Latitude and longitude data is divided into coordinate tiles and converted into a format that can be displayed on the device.
• Administrative-area polygons are simplified into a land-and-sea background without place names or roads.
• All ways tagged waterway=river or waterway=stream in the nationwide OpenStreetMap extract are converted into background lines simplified for each zoom level. River names and OSM IDs are not included in display data.
• GTFS stop order and route geometry are converted into a transit-map display over the land, sea, and nationwide river background.
• Official operator materials and GTFS route colors take priority. Routes without a published color receive a generated identification color.
• Railway stations and nearby bus stops are connected with lines that serve as a guide for possible transfers.

The data providers do not guarantee or endorse the app’s processed display.

Coverage of nationwide river data

The data is not limited to three rivers. It selects all 175,990 river ways and 422,872 stream ways in the fixed nationwide OpenStreetMap extract, for a total of 598,862 ways.

• Low zoom: all rivers — 175,990 lines
• Medium zoom: all rivers plus named streams — 269,335 lines
• High zoom: all rivers and streams — 598,862 lines

Regional data checks

• Hokkaido: 72,710 lines at high zoom
• Tohoku: 85,719 lines at high zoom
• Kanto: 98,876 lines at high zoom
• Chubu: 198,589 lines at high zoom
• Kansai: 87,883 lines at high zoom
• Chugoku: 110,512 lines at high zoom
• Shikoku: 47,806 lines at high zoom
• Kyushu: 70,841 lines at high zoom
• Okinawa: 5,538 lines at high zoom

River data: © OpenStreetMap contributors. Processed data is bundled with an ODbL notice and provided under the Open Data Commons Open Database License (ODbL) 1.0 ↗.

OpenStreetMap is continuously updated by contributors, so the app cannot guarantee that every river found in the real world is included.

Data currency

Generated August 9, 2026

• The land-and-sea background is a simplified rendering of the 2025 National Land Numerical Information Administrative Area dataset. Municipality names and administrative boundaries are not shown.
• The river background covers all 598,862 ways tagged waterway=river or waterway=stream in the nationwide OpenStreetMap extract dated 2026-08-06. Rivers are not selected by name.
• At low zoom, all rivers are shown. At medium zoom, all rivers and named streams are shown. At high zoom, all rivers and streams are shown. River names are not displayed.
• Railway route geometry and stations use fiscal-year 2025 data. Nationwide bus stops and bus route geometry use fiscal-year 2022 data.
• Bus route geometry and stop order come from openly licensed GTFS feeds that were valid on the data-generation date.
• Where no GTFS feed is available, operator-level bus routes from National Land Numerical Information are shown as reference lines. These lines do not contain stop order for individual services.
• Route colors prioritize official operator materials and GTFS. Routes without a published color use a generated identification color.
• Lines connecting railway stations and bus stops are proximity-based guides and do not guarantee that a transfer is possible.

GTFS attribution by provider

Filter the public GTFS feeds included in the app by provider or dataset name. Provider and dataset names are shown as published by their sources.