Author's calls: 名称不明 has no name to use, and ベリベツ川 is mostly farm
waterway now and sits west of 川端橋, outside the range.
デチン沢川 kept pending verification — 沙流川水系, 河川コード 8101070000
(the 「その他」 group), 42.87965 / 142.43823.
Notes that the list is a shortlist to pick from, not a set of things each
of which earns a line.
Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01S6MpcBisZYhX45oDGRRJoz
The previous cross-check fetched only the 「その他」 group and ten main
stems, so 549 of the 561 named rivers in the three systems were never
looked at. Named rivers each carry their own 河川コード and are served
separately. Full sweep now done.
Corrects the claim that ホルカクルキ川 has no W05 counterpart: it does,
河川コード 8101030169, and its position agrees with OSM to the metre
(58.26 km, 9 m off). The 北海道 name plate on the bank confirms the
spelling and gives the Ainu original ホロカ・クルヒ (horka・kurihi) —
'to turn back' and 'its shadow'; horka marks a stream running counter to
its parent river. route01's ホロカクルキ was a slip.
31 of 34 names now confirmed by both sources, all but one agreeing to
within 110 m. Remaining: 名称不明 and デチン沢川 (W05 only), ベリベツ川
(OSM only). サヌシュッペ川 parallels the road and is tangent at two
reaches; it was never a disagreement.
Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01S6MpcBisZYhX45oDGRRJoz
Adds the official river dataset (国土数値情報 河川データセット, via the
Geoshape repository at 国立情報学研究所) as a second source alongside
OpenStreetMap, covering the 石狩川, 鵡川 and 沙流川 systems.
Main stems sit under their own 河川コード rather than the 「その他」 group,
so 夕張川, 鵡川, 穂別川, サヌシュッペ川 and both ウシャップ rivers had to be
fetched separately.
30 of 34 names appear in both sources; 29 of those agree on position to
within 110 m, which validates the projection method. Adds a source column
and notes the four that need care: 名称不明 and デチン沢川 (official only),
ホルカクルキ川 (no W05 counterpart at all), and サヌシュッペ川, which
parallels the road so the two datasets are tangent 5 km apart.
Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01S6MpcBisZYhX45oDGRRJoz
Follows the pulse / pulse_dev split. 274.md keeps the frontmatter, the
intro and the lyrics workspace; everything below moves to 274-dev.md,
which will document how the PoI candidates were assembled and hold the
filtered charts.
Uses the new relative-Markdown-link convention rather than a siblings
macro, in both directions. Dev page carries publish: false to match
274.md while both are under wip/.
Contents moved verbatim; the dev page's own prose is still to be written.
Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01S6MpcBisZYhX45oDGRRJoz
Replace the 由仁-十勝清水 reference section with the narrowed
川端橋 - 右左府 scope.
- structures table gains a kilometre key, derived two ways: sequence
alignment of the 北海道開発局 register against OSM way geometry by
length, and watercourse crossings as anchors where a bridge is named
after the stream it crosses (草木橋, ポン久留喜橋, オロロップ橋,
モトツ橋, 福山大橋, 新川橋)
- watercourses deduplicated 176 -> 32; the inflation was single rivers
split across many OSM ways
- PoI and watercourse tables sorted on the same datum so all three
interleave by distance
- working language switched to English, Japanese kept for proper nouns
- gloss fixed: 川端 as 'riverside', not 'end of a river'
Distances are measured from a datum near 上野幌 and are not official
kiloposts (official KP is roughly this plus 14 km). Full-route data and
the source registers live in the KB at ~/infra/kb/inbox/surreal/.
Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01S6MpcBisZYhX45oDGRRJoz
mikkeli
wan
Mikkeli Matlock