Luxembourg

Benchmark chips for Luxembourg cut from the harmonized field boundary collection for Luxembourg (edition 2026).

Open this collection in the data browser, read the agent guide, or query items.parquet directly.

What is in this collection

This collection holds 775 chips and 87,997 field polygons. Each chip is a square STAC item carrying the label masks rasterized from the field boundaries that fall inside it.

Chips per benchmark split:

How much of a chip is mapped field, as a distribution over the chips (field_coverage_pct):

Every chip carries these label rasters as STAC assets: instance_mask, semantic_2class_mask, semantic_3class_mask, decode_boundary_mask, decode_distance_mask.

680 chips have Sentinel-2 scenes selected for them, one in the planting window and one in the harvest window of the crop calendar. Planting imagery was acquired between 2025-03-22T10:47:28.853000Z and 2025-05-11T10:47:38.751000Z, averaging 0.1% cloud cover (worst 1.9%). Harvest imagery was acquired between 2025-07-25T10:47:07.706000Z and 2025-09-30T10:47:21.386000Z, averaging 0.2% cloud cover (worst 2.0%).

Styles

Ready-made map styles ship with the collection:

• Chips by split (the default view): chips coloured by their train / val / test assignment.
• Field coverage: chips shaded light to dark by the share of their area covered by fields.
• Field outlines: every field in one colour, for reading the boundaries themselves.

Provenance

• Administration des services techniques de l'agriculture: producer, licensor
• Fields of the World: processor
• License: CC-BY-4.0
• Source data: Luxembourg FLIK Parcels (harmonized field boundaries; STAC collection.json)
• Splits assigned with the block3x3 strategy, random seed 42
• Masks rasterized at 10 m per pixel

Suggested uses

• Training and evaluating field boundary delineation models on the pre-assigned, reproducible split.
• Comparing model performance across regions by filtering chips on id, which carries the grid cell each chip was cut from.

Limitations

• Masks are derived from field boundaries declared for a given year; parcels that changed shape, were subdivided or merged after that declaration are not reflected.
• Imagery windows follow a crop calendar rather than a fixed date, so acquisition dates differ between chips and cloud-free scenes are not guaranteed.
• Chips on the border of the source dataset may be only partly covered by field boundaries, and empty area there means unmapped, not fieldless.

Access

items.parquet mirrors every chip item, so the whole collection can be queried without walking the catalog:

See AGENTS.md for the schema, field notes and more queries.

Compared with Fields of the World 1.0

Fields of the World 1.0 published luxembourg with 808 chips (643 train / 81 val / 84 test) cut from 29018 parcels declared for 2022, under CC0-1.0. This collection has 775 chips (601/79/95) cut from 87997 fields declared for 2026.