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274-dev: drop デチン沢川; watercourse shortlist down to 31

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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 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01S6MpcBisZYhX45oDGRRJoz
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Mikkeli Matlock
2026-09-10 01:53:34 +09:00
parent 616e4ee988
commit 0b8fdfe5cc
1 changed files with 2 additions and 5 deletions
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@@ -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 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 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 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. 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. 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 | | 99.93 | 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 | | 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 | | 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 | | 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 | | 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 | | 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. - **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 - **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. waterway, and it sits marginally west of 川端橋, outside the range.
- **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.
**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.
**サヌシュッペ川** is not a disagreement: it runs beside the road rather than crossing it, **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 so each dataset is tangent at a different reach (62.46 / 67.62). The crossing is at