From 0b8fdfe5cc158dd5e91d08411b8957933fa29e8c Mon Sep 17 00:00:00 2001 From: Mikkeli Date: Thu, 10 Sep 2026 01:53:34 +0900 Subject: [PATCH] =?UTF-8?q?274-dev:=20drop=20=E3=83=87=E3=83=81=E3=83=B3?= =?UTF-8?q?=E6=B2=A2=E5=B7=9D;=20watercourse=20shortlist=20down=20to=2031?= MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit Too thin to carry a line. Three exclusions now recorded with reasons (名称不明, ベリベツ川, デチン沢川) so a later sweep does not reintroduce them. Co-Authored-By: Claude Opus 5 Claude-Session: https://claude.ai/code/session_01S6MpcBisZYhX45oDGRRJoz --- wip/274-dev.md | 7 ++----- 1 file changed, 2 insertions(+), 5 deletions(-) diff --git a/wip/274-dev.md b/wip/274-dev.md index 7ed0495..722c93c 100644 --- a/wip/274-dev.md +++ b/wip/274-dev.md @@ -103,7 +103,7 @@ size OSM splits into separate ways. 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. The sweep found -34 names; two were dropped by the author (below), leaving **32**. Of those, 31 appear in +34 names; three were dropped by the author (below), leaving **31**. Of those, 30 appear in both W05 and OpenStreetMap, and all but one agree on position to within 110 m. Offset is closest approach; under ~30 m means the road crosses it. @@ -135,7 +135,6 @@ Offset is closest approach; under ~30 m means the road crosses it. | 99.93 | 145 | 右の沢川 | 沙流川水系 | both | | 99.98 | 79 | ホロカワウシャップ川 | 沙流川水系 | both | | 100.66 | 21 | パンケウシャップ川 | 沙流川水系 | both | -| 102.90 | 32 | デチン沢川 | 沙流川水系 | W05 only | | 103.12 | 23 | 新川 | 沙流川水系 | both | | 104.39 | 15 | ペンケウシャップ川 | 沙流川水系 | both | | 105.99 | 181 | パンケユウケシュオマナイ川 | 沙流川水系 | both | @@ -148,9 +147,7 @@ Excluded by the author, 2026-09-10: - **名称不明** (63.02 km) — W05 carries it with no name; dropped. - **ベリベツ川** (37.38 km in OSM, never within 300 m in W05) — mostly converted to farm waterway, and it sits marginally west of 川端橋, outside the range. - -**デチン沢川**, 102.90 km, is 沙流川水系, 河川コード 8101070000 — the 「その他」 group rather -than a named river of its own. Pending the author's check against the NII database. +- **デチン沢川** (102.90 km, 沙流川水系, 河川コード 8101070000) — too thin to carry a line. **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