From f54cfdbc506625a88fe38dbf5e31ddbbe70db784 Mon Sep 17 00:00:00 2001 From: Mikkeli Date: Wed, 9 Sep 2026 23:36:46 +0900 Subject: [PATCH] =?UTF-8?q?274-dev:=20complete=20the=20W05=20river=20sweep?= =?UTF-8?q?,=20correct=20=E3=83=9B=E3=83=AB=E3=82=AB=E3=82=AF=E3=83=AB?= =?UTF-8?q?=E3=82=AD=E5=B7=9D?= MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit 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 Claude-Session: https://claude.ai/code/session_01S6MpcBisZYhX45oDGRRJoz --- wip/274-dev.md | 40 ++++++++++++++++++++++++---------------- 1 file changed, 24 insertions(+), 16 deletions(-) diff --git a/wip/274-dev.md b/wip/274-dev.md index 1cd2464..a6e8611 100644 --- a/wip/274-dev.md +++ b/wip/274-dev.md @@ -100,13 +100,13 @@ size OSM splits into separate ways. ### Watercourses the road meets -Cross-checked against the 国土数値情報 河川データセット (W05) via the Geoshape repository -at 国立情報学研究所, covering the 石狩川, 鵡川 and 沙流川 systems. 30 of 34 names appear in -both that dataset and OpenStreetMap, and 29 of those agree on position to within 110 m. +Cross-checked against the 国土数値情報 河川データセット (W05) via the Geoshape repository at +国立情報学研究所 — all 561 named rivers of the 石狩川, 鵡川 and 沙流川 systems, since named +rivers each carry their own 河川コード and are not in the 「その他」 group. 34 distinct +names; 31 appear in both W05 and OpenStreetMap, and of those all but one agree on +position to within 110 m. -Offset is closest approach; under ~30 m means the road crosses it. Source column: `both`, -`W05 only` (official but missing from OSM), `OSM only` (in OSM with no official -counterpart at that position). +Offset is closest approach; under ~30 m means the road crosses it. | km | Offset (m) | Watercourse | Water system | Source | |--:|--:|---|---|---| @@ -120,7 +120,7 @@ counterpart at that position). | 52.11 | 16 | 夕張川 | 石狩川水系 | both | | 53.69 | 16 | ポンクルキ川 | 石狩川水系 | both | | 55.14 | 143 | シイタルキ川 | 石狩川水系 | both | -| 58.26 | 9 | ホルカクルキ川 | — | OSM only | +| 58.26 | 9 | ホルカクルキ川 | 石狩川水系 | both | | 58.56 | 52 | 滝沢川 | 石狩川水系 | both | | 59.54 | 58 | 松竹沢川 | 石狩川水系 | both | | 63.02 | 8 | 名称不明 | 鵡川水系 | W05 only | @@ -145,17 +145,25 @@ counterpart at that position). | 107.29 | 18 | 滝の沢川 | 沙流川水系 | both | | 107.83 | 134 | ルウケシオマナイ川 | 沙流川水系 | both | -Four to treat with care: +Three to treat with care: -- **名称不明**, 63.02 km, 8 m off. Carried by W05 with no name at all. -- **デチン沢川**, 102.90 km, in 日高 town. In W05, absent from OSM. -- **ホルカクルキ川**, 58.26 km in OSM, and route01 calls the valley ホロカクルキ川 — - but no such name exists anywhere in W05, whose only クルキ name is ポンクルキ川. -- **サヌシュッペ川** runs beside the road rather than crossing it once, so the two - datasets are tangent 5 km apart (62.46 / 67.62). The crossing is at 大和橋, ~64.4 km. +- **名称不明**, 63.02 km, 8 m off. W05 carries it with no name at all — the register has + a name-shaped hole. Absent from OSM. +- **デチン沢川**, 102.90 km, in 日高 town. In W05, missing from OSM. +- **ベリベツ川** is named in both datasets, but the W05 geometry never comes within 300 m + of the road while OSM puts it 171 m away at 37.38 km, right at 川端橋. -W05 also carries **ホロカユウパロ川** in the 石狩川 system — the Ainu form behind 夕張, -as a river name. Not near R274. +**サヌシュッペ川** is not a disagreement: it runs beside the road rather than crossing it, +so each dataset is tangent at a different reach (62.46 / 67.62). The crossing is at +大和橋, around 64.4 km. Any parallel watercourse behaves this way. + +**ホルカクルキ川** at 58.26 km is confirmed three ways and agrees to the metre: OSM, W05 +(河川コード 8101030169), and the 北海道 name plate on the bank, which reads 一級河川石狩川水系 +ホルカクルキ川 and gives the Ainu original as **ホロカ・クルヒ (horka・kurihi)** — *horka* +"to turn back", *kurihi* "its shadow". In Ainu river naming *horka* marks a stream running +counter to its parent river, so the name records a hydrological fact. The same element +appears on **ホロカユウパロ川** elsewhere in the 石狩川 system — the Ainu form behind 夕張. +route01's ホロカクルキ川 is a slip: the writer applied the Ainu form to the Japanese name. ### PoI, in road order