---
id: ship
type: element
name: Ship
task_types: [polygon_extraction, instance_segmentation, oriented_polygon]
preferred_heads: [validity, context, polygon, instance]
label_formats: [polygon, coco, dota]
positive_label: ship
negative_policy: unlabeled_is_ignore
typical_sensors: [PMS, PAN, SAR]
typical_resolutions_m: [0.5, 1, 2, 3, 10]
---

# Ship

Ships are object targets and should not be forced into a pure semantic
segmentation class. Use polygon or instance heads when annotations support it.

## Required Context

- Ports, aquaculture grids, bridges, and bright wave wakes are hard negatives.
- SAR and optical ship extraction should be sensor-aware.