Datasets:
Add EnvShip-Voyage: long-term ship trajectory imputation dataset + full build pipeline + docs
b61a1c7 verified | # EnvShip-Voyage — Data Card (voyage_v1) | |
| **Task.** Long-term vessel trajectory **imputation** (primary) and **prediction** (secondary) from AIS. | |
| **Region.** DMA (Danish waters), bbox {'lat_min': 53.5, 'lat_max': 59.0, 'lon_min': 7.5, 'lon_max': 14.0}. **Ship classes.** ['cargo', 'tanker']. | |
| **Sampling.** native 1 min; flagship view 5 min. | |
| **Windows.** [12, 6] h, stride 6 h. | |
| **Masks.** continuous curriculum + MCAR + real gaps (frozen bank, seed 1220). | |
| **Splits.** vessel-disjoint MMSI-hash [0.7, 0.1, 0.2] + temporal pretrain pool. | |
| **Provenance.** DMA AIS (['2026-01', '2026-02', '2026-03', '2026-04', '2026-05', '2026-06']); reuse of EnvShip stages 01-04; see PLAN + RESEARCH_NOTES. | |
| ## Summary statistics | |
| ```json | |
| { | |
| "n_samples": 179131, | |
| "splits": { | |
| "train": 118292, | |
| "test": 40903, | |
| "val": 19936 | |
| }, | |
| "window_len_h": { | |
| "6": 100278, | |
| "12": 78853 | |
| }, | |
| "difficulty": { | |
| "medium": 82255, | |
| "easy": 63205, | |
| "hard": 33671 | |
| }, | |
| "ship_class": { | |
| "cargo": 121340, | |
| "tanker": 57791 | |
| }, | |
| "n_vessels": 5804 | |
| } | |
| ``` | |
| ## Comparison | |
| | | KDD'24 imputation | EnvShip (short-term) | **EnvShip-Voyage** | | |
| |---|---|---|---| | |
| | horizon | 12 h | 10-60 min | 12 h / 6 h | | |
| | sampling | 5 min | 20 s | 1 min native / 5 min flagship | | |
| | task | imputation | prediction | imputation + prediction | | |
| | masks | cont 6/8/10 h | - | cont 1-10 h + MCAR + real gaps | | |
| | environment | none | anchor raster | streaming basemap + fairway network | | |
| | region prior | none | coastline | fairway / traffic network (first-class) | | |
| ## Intended use / limits | |
| Research benchmark for maritime trajectory imputation and long-horizon prediction. Not for navigation | |
| or vessel re-identification. MMSI is pseudonymised. Derived from public AIS + OSM + ETOPO 2022 bathymetry. | |