What you can explore

Explore annual catchments and ID15 areas. Search for a municipality to open its area composition by fixed effort band, including missing, conflicting and uncovered areas.

Documentation

Publisher: Styrelsen for Grøn Arealomlægning og Vandmiljø (SGAV)
Geographic coverage: Denmark
Temporal coverage: 2019–2026
Coordinate reference system: EPSG:25832
Geometry: Polygon and MultiPolygon
Terms: CC0 1.0 ↗

Original annual ZIP archives from Landbrugsstyrelsen and SGAV. Unusual numeric DBF tokens are decoded using a narrow, versioned rule. Original files are preserved.

Use the data yourself

CC0 1.0 · You may copy, adapt and share the data, including commercially. Credit is good practice, but is not required by CC0.

Suggested credit: Landbrugsstyrelsen / SGAV · Indsatsbehov i målrettet kvælstofregulering · CC0

The official metadata for this exact series states CC0 and explicitly links the download catalogue. Older editions rely on the series grant; 2024–2026 also have annual catalogue records. Original polygons are normalised and reprojected for display.

Terms reviewed: 2026-09-15. Processing and calculations: openlanddata.

Available editions

Dataset fields

id15Id

ID15 area

Source administrative ID15 identifier. Repeated on separate polygon fragments; it is not a cross-year identifier.

catchmentId

Coastal catchment

Coastal catchment for this edition. Unassigned polygons retain a missing catchment identifier.

effortRatio

Indicative effort need

Source-reported indicative effort percentage, stored as a ratio. Applies to ID15 in 2019 and catchments in 2020–2026. Only 2020 has a verified reference here to the 2019 catch-crop base area.

retentionRatio

Nitrogen retention

Modelled nitrogen retention, stored as a ratio. Unavailable throughout 2019.

retentionClass

Relative retention class

Classes 1–5 relative within the catchment, not fixed national percentage intervals.

catchmentEffortHa

Indicative catchment effort

Indicative hectare total for the whole catchment in 2020–2026. Do not sum across polygons. Omitted in 2019.

applicationIndicated

Application indicated in this edition

Historical application indication in the annual source, not current eligibility advice.

mappedAreaHa

Source polygon area

Source polygon area calculated in EPSG:25832. Separate from catchment effort hectares.

Limitations and responsibility

The calculation area is the land included in that year’s catch-crop calculation. The percentage applies to this area, not the whole mapped area. The map does not show measured pollution, established catch crops or individual farm requirements or compliance. Boundaries and rules can change between years; consult the annual official guidance. No changes between years are calculated. Ordinary readers can lose values in original DBF files.

Targeted nitrogen regulation effort need