TraceVoy

Licenses

Updated 9 October 2026

TraceVoy is built on open data and open fonts. These are the notices for what the app uses, what goes into its films and posters, and what this site shows.

Map data: OpenStreetMap

Map data © OpenStreetMap contributorsAvailable under the Open Database License (ODbL) 1.0. See openstreetmap.org/copyright.

Roads, paths, railways, buildings, water, place labels and points of interest in TraceVoy's maps come from OpenStreetMap. TraceVoy draws them with its own map renderer and style. Every film and poster carries the credit © OpenStreetMap contributors, and it cannot be switched off.

Vector tiles: OpenFreeMap and OpenMapTiles

OpenFreeMap © OpenMapTiles Data from OpenStreetMap

The OpenStreetMap data reaches the app as vector tiles from OpenFreeMap (openfreemap.org), built to the OpenMapTiles schema (openmaptiles.org).

Terrain: Mapterhorn

Terrain © MapterhornSources and their licences: mapterhorn.com/attribution

Elevation for 3D terrain and hill shading comes from Mapterhorn (mapterhorn.com), which combines open elevation data from many producers. The worldwide base is Copernicus GLO-30:

Produced using Copernicus WorldDEM-30 © DLR e.V. 2010-2014 and © Airbus Defence and Space GmbH 2014-2018 provided under COPERNICUS by the European Union and ESA; all rights reserved.The organisations in charge of the Copernicus programme by law or by delegation do not incur any liability for any use of the Copernicus WorldDEM-30.

Where Mapterhorn's terrain for Japan comes from the Geospatial Information Authority of Japan (GSI), used under the GSI content terms:

「基盤地図情報（数値標高モデル）」（国土地理院）をもとに作成Created from the Fundamental Geospatial Data (Digital Elevation Model) of the Geospatial Information Authority of Japan.

Other regions draw on further national and regional open data, under licences such as CC BY, public domain, Licence Ouverte, Datenlizenz Deutschland and Open Government Licences. Each producer is credited at mapterhorn.com/attribution.

Place names: GeoNames

Place names: GeoNames (geonames.org), CC BY 4.0Filtered and converted for offline use in the app. The data is provided “as is”, without warranty.

TraceVoy names towns, cities and regions on the iPhone from a gazetteer built from GeoNames data, so no location leaves the device. Some stop names come from points of interest in the OpenStreetMap tiles.

How routes are made

Routes in TraceVoy's films are computed on the iPhone from OpenStreetMap data. The road and rail network built for this is a derivative of the OpenStreetMap database, and the routes drawn from it are produced works. As section 4.6 of the ODbL asks, this is the method used to make it.

  1. Source. OpenStreetMap ways in OpenFreeMap vector tiles (OpenMapTiles schema, transportation layer), read by class: motorway, trunk, primary, secondary, tertiary, minor, service, track, path, busway, ferry, rail and transit.
  2. Tile edges. Each tile's lines are clipped at the tile edge, so neighbouring tiles join without overlap.
  3. Points. Nearby points are merged, so lines that meet in the data meet in the network.
  4. Junctions. T-junctions (a line ending on another) and level crossings (two lines crossing on the same level) are rebuilt as junctions. Bridges and tunnels are kept apart from what they pass over or under.
  5. Connected parts. The network is split into connected parts, so a stop is only joined to roads that lead somewhere.
  6. Search. A* search finds the quickest path for each profile, with a set speed per class:
    • car: roads from motorway to track, and ferries; skips ways marked access=no and parking aisles;
    • foot: roads and paths except motorways and busways, and ferries;
    • bike: roads, paths and tracks except motorways, and ferries;
    • rail: rail and transit lines, leaving out preserved, miniature and funicular lines, with 350 m walking transfer links between stations;
    • ferry: ferry lines.
  7. One-way streets. Respected from zoom 12, where the tiles carry them. If they block every path, the search runs again without them.
  8. Zoom. Short legs use zoom 14 tiles. Long legs use a corridor of lower-zoom tiles, refined at zoom 14 near both ends.
  9. Checks. The path is simplified. A route far longer than the straight line is dropped and drawn dashed, as an estimate. Flights are drawn as arcs and not routed.

The network is built on the iPhone for each trip and is not published or shared. The tiles it comes from are public at openfreemap.org. Questions about the method are welcome through Support.

Type

Text in TraceVoy's films and posters is set in Inter and Pretendard, which are bundled in the app. This site uses a Latin web subset of Inter (from Fontsource). Both fonts are under the SIL Open Font License 1.1.

InterCopyright (c) 2016 The Inter Project Authors (github.com/rsms/inter). SIL Open Font License 1.1.

PretendardCopyright (c) 2021, Kil Hyung-jin (github.com/orioncactus/pretendard), with Reserved Font Name Pretendard. SIL Open Font License 1.1.

Inter license text 
Copyright (c) 2016 The Inter Project Authors (https://github.com/rsms/inter)

This Font Software is licensed under the SIL Open Font License, Version 1.1.
This license is copied below, and is also available with a FAQ at:
http://scripts.sil.org/OFL

-----------------------------------------------------------
SIL OPEN FONT LICENSE Version 1.1 - 26 February 2007
-----------------------------------------------------------

PREAMBLE
The goals of the Open Font License (OFL) are to stimulate worldwide
development of collaborative font projects, to support the font creation
efforts of academic and linguistic communities, and to provide a free and
open framework in which fonts may be shared and improved in partnership
with others.

The OFL allows the licensed fonts to be used, studied, modified and
redistributed freely as long as they are not sold by themselves. The
fonts, including any derivative works, can be bundled, embedded,
redistributed and/or sold with any software provided that any reserved
names are not used by derivative works. The fonts and derivatives,
however, cannot be released under any other type of license. The
requirement for fonts to remain under this license does not apply
to any document created using the fonts or their derivatives.

DEFINITIONS
"Font Software" refers to the set of files released by the Copyright
Holder(s) under this license and clearly marked as such. This may
include source files, build scripts and documentation.

"Reserved Font Name" refers to any names specified as such after the
copyright statement(s).

"Original Version" refers to the collection of Font Software components as
distributed by the Copyright Holder(s).

"Modified Version" refers to any derivative made by adding to, deleting,
or substituting -- in part or in whole -- any of the components of the
Original Version, by changing formats or by porting the Font Software to a
new environment.

"Author" refers to any designer, engineer, programmer, technical
writer or other person who contributed to the Font Software.

PERMISSION AND CONDITIONS
Permission is hereby granted, free of charge, to any person obtaining
a copy of the Font Software, to use, study, copy, merge, embed, modify,
redistribute, and sell modified and unmodified copies of the Font
Software, subject to the following conditions:

1) Neither the Font Software nor any of its individual components,
in Original or Modified Versions, may be sold by itself.

2) Original or Modified Versions of the Font Software may be bundled,
redistributed and/or sold with any software, provided that each copy
contains the above copyright notice and this license. These can be
included either as stand-alone text files, human-readable headers or
in the appropriate machine-readable metadata fields within text or
binary files as long as those fields can be easily viewed by the user.

3) No Modified Version of the Font Software may use the Reserved Font
Name(s) unless explicit written permission is granted by the corresponding
Copyright Holder. This restriction only applies to the primary font name as
presented to the users.

4) The name(s) of the Copyright Holder(s) or the Author(s) of the Font
Software shall not be used to promote, endorse or advertise any
Modified Version, except to acknowledge the contribution(s) of the
Copyright Holder(s) and the Author(s) or with their explicit written
permission.

5) The Font Software, modified or unmodified, in part or in whole,
must be distributed entirely under this license, and must not be
distributed under any other license. The requirement for fonts to
remain under this license does not apply to any document created
using the Font Software.

TERMINATION
This license becomes null and void if any of the above conditions are
not met.

DISCLAIMER
THE FONT SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO ANY WARRANTIES OF
MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT
OF COPYRIGHT, PATENT, TRADEMARK, OR OTHER RIGHT. IN NO EVENT SHALL THE
COPYRIGHT HOLDER BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
INCLUDING ANY GENERAL, SPECIAL, INDIRECT, INCIDENTAL, OR CONSEQUENTIAL
DAMAGES, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
FROM, OUT OF THE USE OR INABILITY TO USE THE FONT SOFTWARE OR FROM
OTHER DEALINGS IN THE FONT SOFTWARE.
Pretendard license text 
Copyright (c) 2021, Kil Hyung-jin (https://github.com/orioncactus/pretendard),
with Reserved Font Name Pretendard.

This Font Software is licensed under the SIL Open Font License, Version 1.1.
This license is copied below, and is also available with a FAQ at:
https://scripts.sil.org/OFL


-----------------------------------------------------------
SIL OPEN FONT LICENSE Version 1.1 - 26 February 2007
-----------------------------------------------------------

PREAMBLE
The goals of the Open Font License (OFL) are to stimulate worldwide
development of collaborative font projects, to support the font creation
efforts of academic and linguistic communities, and to provide a free and
open framework in which fonts may be shared and improved in partnership
with others.

The OFL allows the licensed fonts to be used, studied, modified and
redistributed freely as long as they are not sold by themselves. The
fonts, including any derivative works, can be bundled, embedded, 
redistributed and/or sold with any software provided that any reserved
names are not used by derivative works. The fonts and derivatives,
however, cannot be released under any other type of license. The
requirement for fonts to remain under this license does not apply
to any document created using the fonts or their derivatives.

DEFINITIONS
"Font Software" refers to the set of files released by the Copyright
Holder(s) under this license and clearly marked as such. This may
include source files, build scripts and documentation.

"Reserved Font Name" refers to any names specified as such after the
copyright statement(s).

"Original Version" refers to the collection of Font Software components as
distributed by the Copyright Holder(s).

"Modified Version" refers to any derivative made by adding to, deleting,
or substituting -- in part or in whole -- any of the components of the
Original Version, by changing formats or by porting the Font Software to a
new environment.

"Author" refers to any designer, engineer, programmer, technical
writer or other person who contributed to the Font Software.

PERMISSION & CONDITIONS
Permission is hereby granted, free of charge, to any person obtaining
a copy of the Font Software, to use, study, copy, merge, embed, modify,
redistribute, and sell modified and unmodified copies of the Font
Software, subject to the following conditions:

1) Neither the Font Software nor any of its individual components,
in Original or Modified Versions, may be sold by itself.

2) Original or Modified Versions of the Font Software may be bundled,
redistributed and/or sold with any software, provided that each copy
contains the above copyright notice and this license. These can be
included either as stand-alone text files, human-readable headers or
in the appropriate machine-readable metadata fields within text or
binary files as long as those fields can be easily viewed by the user.

3) No Modified Version of the Font Software may use the Reserved Font
Name(s) unless explicit written permission is granted by the corresponding
Copyright Holder. This restriction only applies to the primary font name as
presented to the users.

4) The name(s) of the Copyright Holder(s) or the Author(s) of the Font
Software shall not be used to promote, endorse or advertise any
Modified Version, except to acknowledge the contribution(s) of the
Copyright Holder(s) and the Author(s) or with their explicit written
permission.

5) The Font Software, modified or unmodified, in part or in whole,
must be distributed entirely under this license, and must not be
distributed under any other license. The requirement for fonts to
remain under this license does not apply to any document created
using the Font Software.

TERMINATION
This license becomes null and void if any of the above conditions are
not met.

DISCLAIMER
THE FONT SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO ANY WARRANTIES OF
MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT
OF COPYRIGHT, PATENT, TRADEMARK, OR OTHER RIGHT. IN NO EVENT SHALL THE
COPYRIGHT HOLDER BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
INCLUDING ANY GENERAL, SPECIAL, INDIRECT, INCIDENTAL, OR CONSEQUENTIAL
DAMAGES, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
FROM, OUT OF THE USE OR INABILITY TO USE THE FONT SOFTWARE OR FROM
OTHER DEALINGS IN THE FONT SOFTWARE.

Photos in the sample frames

The frames and screenshots on this site show a sample trip, Korea in 4 days, made from photos on Wikimedia Commons. The photos appear resized and cropped in TraceVoy's photo cards and thumbnails, with their capture times changed for testing. Each is used under the licence named, and credited to its author.

48 photos, with author and licence
  1. Geunjeongjeon, Seoul.jpg · Tristan Surtel · CC BY-SA 4.0 · Gyeongbokgung Palace, Seoul
  2. Front view of the Imperial Throne Hall Geunjeongjeon at Gyeongbokgung Palace with blue sky in Seoul.jpg · Basile Morin · CC BY-SA 4.0 · Gyeongbokgung Palace, Seoul
  3. Front view of the Eastern side of the Imperial Throne Hall Geunjeongjeon at Gyeongbokgung Palace in Seoul.jpg · Basile Morin · CC BY-SA 4.0 · Gyeongbokgung Palace, Seoul
  4. 2012-05-11 Sujeongjeon.jpg · Mario Sánchez Prada · CC BY-SA 2.0 · Gyeongbokgung Palace, Seoul
  5. Gyeonghoeru, Gyeongbokgung.jpg · Tristan Surtel · CC BY-SA 4.0 · Gyeongbokgung Palace, Seoul
  6. Gyedong-gil street with climbing plants at golden hour in Seoul South Korea.jpg · Basile Morin · CC BY-SA 4.0 · Bukchon Hanok Village, Seoul
  7. Bukchon-ro 11-gil street with hanok houses in Bukchon Hanok Village Seoul.jpg · Basile Morin · CC BY-SA 4.0 · Bukchon Hanok Village, Seoul
  8. Bukchon-ro 11-gil street with hanok houses and blue sky in Bukchon Hanok Village Seoul.jpg · Basile Morin · CC BY-SA 4.0 · Bukchon Hanok Village, Seoul
  9. Wooden gate and flowerpots in Bukchon Hanok Village in Seoul.jpg · Basile Morin · CC BY-SA 4.0 · Bukchon Hanok Village, Seoul
  10. 2012-05-11 Insadong 01.jpg · Mario Sánchez Prada · CC BY-SA 2.0 · Insadong, Seoul
  11. 2012-05-11 Cargo motor trike and shops in Insadong.jpg · Mario Sánchez Prada · CC BY-SA 2.0 · Insadong, Seoul
  12. 2012-05-11 Insadong 02.jpg · Mario Sánchez Prada · CC BY-SA 2.0 · Insadong, Seoul
  13. 2012-05-11 Insadong.jpg · Mario Sánchez Prada · CC BY-SA 2.0 · Insadong, Seoul
  14. Wongwt 愛情鎖 (16941229990).jpg · Wei-Te Wong from Taipei City, Taiwan, Republic of China · CC BY-SA 2.0 · N Seoul Tower, Namsan, Seoul
  15. Wongwt N 首爾塔 (16941218830).jpg · Wei-Te Wong from Taipei City, Taiwan, Republic of China · CC BY-SA 2.0 · N Seoul Tower, Namsan, Seoul
  16. View from N Seoul Tower a4.jpg · CYAN · CC BY-SA 4.0 · N Seoul Tower, Namsan, Seoul
  17. Wongwt 首爾 (17128095841).jpg · Wei-Te Wong from Taipei City, Taiwan, Republic of China · CC BY-SA 2.0 · N Seoul Tower, Namsan, Seoul
  18. Wongwt 首爾火車站 (16942638829).jpg · Wei-Te Wong from Taipei City, Taiwan, Republic of China · CC BY-SA 2.0 · Seoul Station
  19. 2023년 7월 집중호우로 일반열차 중단.jpg · 이강철 This photo was taken with Samsung Galaxy A32 · CC BY-SA 4.0 · Seoul Station
  20. KTX-산천 중련연결.jpg · revi · CC BY 2.0 kr · Seoul Station
  21. KTX Korea Train Express Seoul Station Seoul South Korea Republic of Korea ROK Daehan Minguk (45707198492).jpg · bryan... · CC BY-SA 2.0 · KTX at Busan Station
  22. Busan Station Busan (31885854218).jpg · bryan... · CC BY-SA 2.0 · Busan Station
  23. Entrance of the Gamcheon Culture Village.jpg · Christophe95 · CC BY-SA 4.0 · Gamcheon Culture Village, Busan
  24. Gamcheon Cultural Village, Busan.jpg · Brit in Seoul · CC BY-SA 4.0 · Gamcheon Culture Village, Busan
  25. Busan, KR, October 2019 04.jpg · Ahmed · CC BY-SA 4.0 · Gamcheon Culture Village, Busan
  26. Stairs in the Gamcheon Culture Village 1.jpg · Christophe95 · CC BY-SA 4.0 · Gamcheon Culture Village, Busan
  27. Jagalchi Fish Market 1.jpg · Dudva · CC BY-SA 4.0 · Jagalchi Market, Busan
  28. Jagalchi Market 3.jpg · Christophe95 · CC BY-SA 4.0 · Jagalchi Market, Busan
  29. Haeundae Beach May 2024.jpg · Brit in Seoul · CC BY-SA 4.0 · Haeundae Beach, Busan
  30. Haeundae Beach Busan (43931400330).jpg · bryan... · CC BY-SA 2.0 · Haeundae Beach, Busan
  31. Haeundae Beach in 2018 (4).jpg · Christophe95 · CC BY-SA 4.0 · Haeundae Beach, Busan
  32. Haeundae Beach at night, Busan.jpg · VN.NguyenDucDuy · CC BY-SA 4.0 · Haeundae Beach, Busan
  33. Gimhae International Airport.jpg · 螺钉 · CC BY-SA 3.0 · Gimhae International Airport, Busan
  34. Geoje Island, South Korea (1).jpg · Brit in Seoul · CC BY-SA 4.0 · Airplane window over Geoje island (flight PUS-CJU)
  35. “The moment you doubt whether you can fly, you cease for ever to be able to do it.” ―J.M. Barrie, Peter Pan ✈️ (25972852591).jpg · anokarina · CC BY-SA 2.0 · Jeju International Airport (arrival)
  36. Jeju Airport, Jeju Island, South Korea 🇰🇷.jpg · Sharon Hahn Darlin · CC BY 4.0 · Jeju International Airport
  37. Ilchul-ro, Seongsan-eup, Seogwipo-si, Jeju-do, South Korea - panoramio - song songroov (1).jpg · song songroov · CC BY 3.0 · Seongsan Ilchulbong, Jeju
  38. ―where the stairs meet the clouds (25726154100).jpg · anokarina · CC BY-SA 2.0 · Seongsan Ilchulbong, Jeju
  39. Sunrise Peak.jpg · Letmeuseflowers · CC BY-SA 3.0 · Seongsan Ilchulbong, Jeju
  40. Jeju Island (53854724130).jpg · David Lee from Redmond, WA, USA · CC BY 2.0 · Seongsan Ilchulbong, Jeju
  41. Hydrangea macrophylla in front of Seongsan Ilchulbong volcano at blue hour in Jeju Island South Korea.jpg · Basile Morin · CC BY-SA 4.0 · Seongsan Ilchulbong, Jeju
  42. Wooden staircase steps in the forest of Hallasan Park Eorimok Trail at dusk on Jeju Island in South Korea.jpg · Basile Morin · CC BY-SA 4.0 · Hallasan area, Jeju
  43. Green vegetation on the low cloud-swept relief in Hallasan National Park Jeju South Korea.jpg · Basile Morin · CC BY-SA 4.0 · Hallasan area, Jeju
  44. Wooden staircase along Yeongsil Trail with the mountains of Hallasan Park Jeju Island South Korea.jpg · Basile Morin · CC BY-SA 4.0 · Hallasan area, Jeju
  45. Hyeop-jae Beach.jpg · Letmeuseflowers · CC BY-SA 3.0 · Hyeopjae Beach, Jeju
  46. Jeju Island Hyeopje Beach.jpg · Engin Cukuroglu · CC BY-SA 3.0 · Hyeopjae Beach, Jeju
  47. Jeju airport.jpg · Jeong seolah · CC0 · Jeju International Airport
  48. Dodui-dong, Jeju-si, Jeju-do, South Korea - panoramio - song songroov (2).jpg · song songroov · CC BY 3.0 · Jeju International Airport (departure)