mikkeli
28665b4279
Co-Authored-By: Claude Opus 5 <noreply@anthropic.com> Claude-Session: https://claude.ai/code/session_013kj58Jugkic783b8ZrtTVZ
30 lines
1022 B
Markdown
30 lines
1022 B
Markdown
---
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type: default
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---
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# Initial plan
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## Inputs
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| Source | What |
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|---|---|
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| Geofabrik | `japan-latest.osm.pbf`, 2.3 GB, or a regional extract |
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| Protomaps daily planet | sliced by bounding box, no planet download needed |
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Start with the region actually driven rather than all of Japan. Geofabrik publishes
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Kantō, Chūbu, Hokkaidō and others separately.
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## Steps
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1. Fetch the PBF for the target region.
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2. `valhalla_build_admins` — driving side and border data.
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3. `valhalla_build_tiles` — the routing graph, output as a directory.
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4. `go-pmtiles extract` against the Protomaps planet for the same bounding box.
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5. Record source dates and output sizes in a report under `docs/impl/reports/`.
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## Delivery
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Out of scope for now — the artifacts are moved by hand. When it stops being
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tolerable, `rsync` over the LAN only, never over LTE, with `--partial-dir` so a
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transfer survives being cut off. Swap atomically: build beside the live copy,
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symlink-swap, restart. Never overwrite tiles the server is reading.
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