# Credits

All third-party media used by «Хийд». Procedural 3D models and code are our own. Textures in `public/assets/tex/` are CC0 (credited separately by the team that added them).

## Audio (`public/assets/audio/`)

Freesound pages were checked for licence on 2026-11-05. Files are the Freesound high-quality MP3 previews, trimmed, faded, high-passed where noted, loudness-normalised (`loudnorm`) and re-encoded mono with ffmpeg.

| File | What | Source recording | Author | Licence | URL |
|---|---|---|---|---|---|
| `chant.mp3`, `chant.ogg` (Opus in Ogg) | 90 s of Mongolian Buddhist monks chanting at a public ceremony (segment 1:40–3:10, high-pass 140 Hz to cut wind rumble) | “Buddhist ceremony in Ulaanbaatar” — recorded on Sükhbaatar Square, Ulaanbaatar | barryshamir | CC0 1.0 | https://freesound.org/s/876446/ |
| `chant-alt.mp3` | Alternative: 90 s of ~200 Tibetan monks chanting the call to prayer, Labrang Monastery (segment 0:30–2:00). Some bystander voices in background | “Buddhist Monks calling to prayer” | Lenguaverde | CC0 1.0 | https://freesound.org/s/401910/ |
| `horn.mp3` | 40 s of dungchen (long Buddhist horns), Bhutan (segment 0:20–1:00) — stand-in for Mongolian ухэр бүрээ | “Dungchen Festival Horns - Bhutan.wav” | RTB45 | CC BY 4.0 — attribution required | https://freesound.org/s/192680/ |
| `pigeons.mp3` | 25 s pigeons cooing in a city park | “pidgeons cooing city park.wav” | pawsound | CC0 1.0 | https://freesound.org/s/154865/ |
| `wind.mp3` | 60 s wind blowing over grass on an open plain (Patagonia) — steppe stand-in | “Wind is blowing in the grass of a patagonian plain” | felix.blume | CC0 1.0 | https://freesound.org/s/139337/ |

Attribution line for the UI/about page (required for CC BY): «Бүрээний дуу: RTB45, freesound.org/s/192680, CC BY 4.0».

Other freely licensed candidates found but not used: “maidar1.wav” (Maidar procession, Ulaanbaatar 2011, pcfstnk, CC0, https://freesound.org/s/212426/); “Gong Tibetan Buddhist temple Ulaanbaatar Mongolia” (Vortichez, CC BY 4.0, https://freesound.org/s/432568/); “BR_094_Himalaya_Buddhistmonks” (kevp888, CC BY 4.0, https://freesound.org/s/440240/ — contains a long sustained horn from 0:45); “pigeon walking and cooing.wav” (5ro4, CC0, https://freesound.org/s/701282/).

## Reference photos (`docs/ref/`, not shipped in the app)

Wikimedia Commons; full table with descriptions in `docs/ref/INDEX.md`.

- `docs/ref/ez-wall-stupas.jpg` — “Erdenezu wall - panoramio.jpg” by Alex Ang, CC BY-SA 3.0, https://commons.wikimedia.org/wiki/File:Erdenezu_wall_-_panoramio.jpg
- `docs/ref/ez-wall-stupas-closeup.jpg` — “Stupy w murze klasztoru Erdene Dzuu 03.jpg” by Marcin Konsek, CC BY-SA 4.0, https://commons.wikimedia.org/wiki/File:Stupy_w_murze_klasztoru_Erdene_Dzuu_03.jpg
- `docs/ref/ez-overview-from-hill.jpg` — “Klasztor Erdene Dzuu widziany ze szczytu wzniesienia.jpg” by Marcin Konsek, CC BY-SA 4.0, https://commons.wikimedia.org/wiki/File:Klasztor_Erdene_Dzuu_widziany_ze_szczytu_wzniesienia.jpg
- `docs/ref/ez-gate-main.jpg` — “Erdene Zuu Monastery 07.jpg” by Bernard Gagnon, CC0, https://commons.wikimedia.org/wiki/File:Erdene_Zuu_Monastery_07.jpg
- `docs/ref/ez-gol-zuu-front.jpg` — “Gol Zuu Temple 01.jpg” by Bernard Gagnon, CC0, https://commons.wikimedia.org/wiki/File:Gol_Zuu_Temple_01.jpg
- `docs/ref/ez-three-temples-courtyard.jpg` — “Trzy główne świątynie w klasztorze Erdene Dzuu.jpg” by Marcin Konsek, CC BY-SA 4.0, https://commons.wikimedia.org/wiki/File:Trzy_g%C5%82%C3%B3wne_%C5%9Bwi%C4%85tynie_w_klasztorze_Erdene_Dzuu.jpg
- `docs/ref/ez-zuun-zuu-exterior.jpg` — “Świątynia Wschodnia w klasztorze Erdene Dzuu (01).jpg” by Marcin Konsek, CC BY-SA 4.0, https://commons.wikimedia.org/wiki/File:%C5%9Awi%C4%85tynia_Wschodnia_w_klasztorze_Erdene_Dzuu_(01).jpg
- `docs/ref/ez-lavrin-front.jpg` — “Lavrin Temple 01.jpg” by Bernard Gagnon, CC0, https://commons.wikimedia.org/wiki/File:Lavrin_Temple_01.jpg
- `docs/ref/ez-golden-stupa.jpg` — “Złota Stupa w klasztorze Erdene Dzuu 01.jpg” by Marcin Konsek, CC BY-SA 4.0, https://commons.wikimedia.org/wiki/File:Z%C5%82ota_Stupa_w_klasztorze_Erdene_Dzuu_01.jpg
- `docs/ref/ez-interior-baruun-zuu-shakyamuni.jpg` — “Budda Siakjamuni w Świątyni Zachodniej w klasztorze Erdene Dzuu.jpg” by Marcin Konsek, CC BY-SA 4.0, https://commons.wikimedia.org/wiki/File:Budda_Siakjamuni_w_%C5%9Awi%C4%85tyni_Zachodniej_w_klasztorze_Erdene_Dzuu.jpg
- `docs/ref/ez-stone-turtle.jpg` — “Protecting Turtle, Erdene Zuu Monastery.jpg” by François  Philipp from Darmstadt, Germany, CC BY 2.0, https://commons.wikimedia.org/wiki/File:Protecting_Turtle,_Erdene_Zuu_Monastery.jpg
- `docs/ref/ez-prayer-wheels.jpg` — “Młynki modlitewne w klasztorze Erdene Dzuu 01.jpg” by Marcin Konsek, CC BY-SA 4.0, https://commons.wikimedia.org/wiki/File:M%C5%82ynki_modlitewne_w_klasztorze_Erdene_Dzuu_01.jpg
- `docs/ref/gandan-gate.jpg` — “Gandantegchinlen Monastery 01.jpg” by Bernard Gagnon, CC0, https://commons.wikimedia.org/wiki/File:Gandantegchinlen_Monastery_01.jpg
- `docs/ref/gandan-pigeons-feeding.jpg` — “Feeding Pigeons (8368884478).jpg” by A. Omer Karamollaoglu from Ankara, Turkey, CC BY 2.0, https://commons.wikimedia.org/wiki/File:Feeding_Pigeons_(8368884478).jpg
- `docs/ref/gandan-pigeons-square.jpg` — “Pigeons (703114711).jpg” by Steve Burt from Portland, USA, CC BY-SA 2.0, https://commons.wikimedia.org/wiki/File:Pigeons_(703114711).jpg
- `docs/ref/gandan-migjid-front.jpg` — “MegjidJanraisigTemple (1).jpg” by CeeGee, CC BY-SA 4.0, https://commons.wikimedia.org/wiki/File:MegjidJanraisigTemple_(1).jpg
- `docs/ref/gandan-migjid-side.jpg` — “Midjed Janraisig from side (2398010419).jpg” by Honza Soukup from Czech Republic, CC BY 2.0, https://commons.wikimedia.org/wiki/File:Midjed_Janraisig_from_side_(2398010419).jpg
- `docs/ref/gandan-stupas-before-migjid.jpg` — “Zespół klasztoru Gandan (03).jpg” by Marcin Konsek, CC BY-SA 4.0, https://commons.wikimedia.org/wiki/File:Zesp%C3%B3%C5%82_klasztoru_Gandan_(03).jpg
- `docs/ref/gandan-statue-janraisig.jpg` — “Avalokiteshvara statue, Megjid Janraisig temple.jpg” by Dudva, CC0, https://commons.wikimedia.org/wiki/File:Avalokiteshvara_statue,_Megjid_Janraisig_temple.jpg
- `docs/ref/gandan-ayush-niches.jpg` — “Zespół klasztoru Gandan (22).jpg” by Marcin Konsek, CC BY-SA 4.0, https://commons.wikimedia.org/wiki/File:Zesp%C3%B3%C5%82_klasztoru_Gandan_(22).jpg
- `docs/ref/gandan-prayer-wheels-row.jpg` — “Gandantegchinlen Monastery 12.jpg” by Bernard Gagnon, CC0, https://commons.wikimedia.org/wiki/File:Gandantegchinlen_Monastery_12.jpg
- `docs/ref/gandan-stupa-prayer-wheels.jpg` — “Prayer Wheels (6228036769).jpg” by Francisco Anzola, CC BY 2.0, https://commons.wikimedia.org/wiki/File:Prayer_Wheels_(6228036769).jpg
- `docs/ref/gandan-square-overview.jpg` — “Gandantegchinlen Monastery (2024).jpg” by Chongkian, CC BY-SA 4.0, https://commons.wikimedia.org/wiki/File:Gandantegchinlen_Monastery_(2024).jpg
- `docs/ref/gandan-roof-ornaments.jpg` — “Gandantegchinlen Monastery 10.jpg” by Bernard Gagnon, CC0, https://commons.wikimedia.org/wiki/File:Gandantegchinlen_Monastery_10.jpg

## Data

- Site geometry for Эрдэнэ Зуу and Гандан in `docs/research.md` was measured from OpenStreetMap data © OpenStreetMap contributors, ODbL 1.0 (https://www.openstreetmap.org/copyright).