Add v3: 16 regions × (nodes + edges), 8 time slots × weekday/weekend

README.md

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+---
+license: cc-by-nc-4.0
+language:
+  - ko
+  - en
+tags:
+  - transportation
+  - road-network
+  - routing
+  - eta
+  - korea
+  - osm
+  - ktdb
+size_categories:
+  - 100K<n<1M
+pretty_name: Korea Road Network ETA (v3)
+---
+
+# Korea Road Network ETA (v3)
+
+16개 광역지자체 도로망 그래프. 시간대별 평균 통행속도(p50)가 부착되어 있어
+ETA(예상소요시간) 산정·라우팅·배차 시뮬레이션에 바로 사용 가능합니다.
+
+## Contents
+
+각 region 마다 self-contained 파일 두 개:
+
+- `{region}_osm_v3_nodes.parquet` — 노드 (`node_id`, `lat`, `lon`)
+- `{region}_osm_v3_edges.parquet` — 엣지 (`source`, `target`, `length_m`,
+  `highway`, `oneway`, `ktdb_matched`, …, **시간대별 속도 컬럼**)
+
+### Regions (16)
+
+`seoul`, `busan`, `daegu`, `incheon`, `gwangju`, `daejeon`, `ulsan`, `sejong`,
+`gyeonggi`, `gangwon`, `chungbuk`, `chungnam`, `jeonbuk`, `jeonnam`,
+`gyeongbuk`, `gyeongnam`
+
+### Speed columns (8 slots × weekday/weekend)
+
+스키마: `{day_type}_{slot}_p50` (단위: km/h)
+
+- `day_type` ∈ {`weekday`, `weekend`}
+- `slot` ∈
+  - **observed** (KTDB 직접 관측): `am_peak`, `midday`, `pm_peak`, `offpeak`
+  - **derived** (관측 4슬롯에서 도출): `am_shoulder`, `afternoon`,
+    `pm_shoulder`, `night`
+
+도출 규칙은 도로 위계 그룹별로 다른 가중치/계수를 사용 — 자세한 내용은
+프로젝트 코드(`phase_d_attach.py`) 참조.
+
+## Quick start
+
+```python
+import pandas as pd
+
+nodes = pd.read_parquet("seoul_osm_v3_nodes.parquet")
+edges = pd.read_parquet("seoul_osm_v3_edges.parquet")
+
+# Edge travel time (sec) at AM peak
+speed_kmh = edges["weekday_am_peak_p50"].clip(lower=5.0)
+edges["tt_sec"] = edges["length_m"] / (speed_kmh * 1000 / 3600)
+```
+
+scipy 또는 networkx 등 일반 라우팅 라이브러리에 그대로 투입 가능합니다.
+
+## Provenance
+
+- **Topology**: OpenStreetMap (ODbL) — 2026년 추출
+- **Speeds**: 한국교통DB (KTDB) 링크별 시간대 통행속도 (2024년 관측)
+- **Pipeline**: `phase_a` (6시간 프로파일) → `phase_b` (regional fallback) →
+  `phase_c` (위계 클립) → `phase_d` (attach + derived slots)
+
+## License
+
+Code & derivative speed values: CC BY-NC 4.0
+원본 출처(OSM, KTDB)의 라이선스를 함께 준수해 주세요.
+
+## Citation
+
+학술 인용 시:
+
+```
+CAMUS Lab, "Korea Road Network ETA dataset (v3)",
+HuggingFace, 2026. https://huggingface.co/datasets/CAMUS-LAB/data-road_network_eta
+```

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