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274-dev: cross-check watercourses against 国土数値情報 W05

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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
This commit is contained in:
Mikkeli Matlock
2026-09-09 23:24:37 +09:00
parent 713594399c
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@@ -100,43 +100,62 @@ size OSM splits into separate ways.
### Watercourses the road meets
Deduplicated to one row per name — the earlier count of 176 was the same rivers split
across many OSM ways. Offset is closest approach: under ~30 m means the road crosses it.
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.
| km | Offset (m) | Watercourse |
|--:|--:|---|
| 37.38 | 171 | ベリベツ川 |
| 40.90 | 49 | 砂金川 |
| 43.64 | 15 | 草木川 |
| 44.00 | 21 | 草木舞沢川 |
| 45.19 | 7 | カミの沢川 |
| 48.18 | 63 | チョポツナイ川 |
| 50.28 | 132 | カライケの沢川 |
| 52.11 | 16 | 夕張川 |
| 53.69 | 16 | ポンクルキ川 |
| 55.14 | 143 | シイタルキ川 |
| 58.26 | 9 | ホルカクルキ川 |
| 58.56 | 52 | 滝沢川 |
| 59.54 | 58 | 松竹沢川 |
| 62.46 | 6 | サヌシュッペ川 |
| 66.86 | 157 | 石山の沢川 |
| 70.22 | 32 | 穂別川 |
| 72.93 | 9 | 高西の沢川 |
| 77.05 | 15 | オロロップ沢川 |
| 80.24 | 53 | 鵡川 |
| 86.16 | 3 | パンケモトツ沢川 |
| 88.04 | 26 | ペンケモトツ沢川 |
| 93.73 | 30 | ニセイパオマナイ川 |
| 95.37 | 44 | 一の沢川 |
| 99.93 | 145 | 右の沢川 |
| 99.98 | 79 | ホロカワウシャップ川 |
| 100.66 | 21 | パンケウシャップ川 |
| 103.12 | 26 | 新川 |
| 104.39 | 15 | ペンケウシャップ川 |
| 105.99 | 181 | パンケユウケシュオマナイ川 |
| 106.47 | 52 | オワイタカ沢川 |
| 107.29 | 13 | 滝の沢川 |
| 107.95 | 153 | ルウケシオマナイ川 |
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).
| km | Offset (m) | Watercourse | Water system | Source |
|--:|--:|---|---|---|
| 37.38 | 171 | ベリベツ川 | — | OSM only |
| 41.02 | 58 | 砂金川 | 石狩川水系 | both |
| 43.64 | 84 | 草木川 | 石狩川水系 | both |
| 44.00 | 21 | 草木舞沢川 | 石狩川水系 | both |
| 45.21 | 40 | カミの沢川 | 石狩川水系 | both |
| 48.18 | 63 | チョポツナイ川 | 石狩川水系 | both |
| 50.28 | 132 | カライケの沢川 | 石狩川水系 | both |
| 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 |
| 58.56 | 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 |
| 66.86 | 161 | 石山の沢川 | 鵡川水系 | both |
| 67.62 | 5 | サヌシュッペ川 | 鵡川水系 | both |
| 70.22 | 32 | 穂別川 | 鵡川水系 | both |
| 72.93 | 9 | 高西の沢川 | 鵡川水系 | both |
| 77.05 | 15 | オロロップ沢川 | 鵡川水系 | both |
| 80.24 | 68 | 鵡川 | 鵡川水系 | both |
| 86.16 | 10 | パンケモトツ沢川 | 鵡川水系 | both |
| 88.04 | 26 | ペンケモトツ沢川 | 鵡川水系 | both |
| 93.73 | 30 | ニセイパオマナイ川 | 鵡川水系 | both |
| 95.37 | 44 | 一の沢川 | 鵡川水系 | 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 |
| 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 |
| 106.47 | 52 | オワイタカ沢川 | 沙流川水系 | both |
| 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:
- **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.
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.
### PoI, in road order