Documentation
- Publisher
- Styrelsen for Grøn Arealomlægning og Vandmiljø (SGAV)
- Geographic coverage
- Denmark
- Temporal coverage
- 2020
- Coordinate reference system
- EPSG:25832
- Geometry
- Polygon and MultiPolygon
- Terms
- CC0 1.0 ↗
Edition overview
- Feature count
- 3,656
- Last documented
- 2026-09-15
Technical detailsFor developers and reproducibility
The release ID precisely identifies this published edition. The SHA-256 fingerprint changes when the normalized dataset content changes and can be used for troubleshooting and verification.
- Internal release ID
nitrogen-effort-2020:d3ebdce42d4f379b701d4797ab2462b94045da44d6654bc00f138a22e16b1d2c:a9b16c8e758bb0f12f971bcc4fb8ab9302b82d0112c4fcb5096aa667519379ff- Content fingerprint (SHA-256)
d3ebdce42d4f379b701d4797ab2462b94045da44d6654bc00f138a22e16b1d2c
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 · nitrogen-effort-2020
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.Access to data
Original ZIP with source geometry in EPSG:25832. Older DBF files contain unusual decimal tokens that ordinary readers can lose. Use municipality search in the map to open the annual area composition.
Source fields and processing (TXT)
Technical access with PMTilesURL for software that supports HTTP Range
The map archive requires HTTP Range. Use HEAD for file information and bounded GET requests of at most 2 MiB, for example Range: bytes=0-16383. This URL does not support whole-file browser downloads.
Select and copy the URL into your mapping software.
- Map representation release ID
nitrogen-effort-2020:d3ebdce42d4f379b701d4797ab2462b94045da44d6654bc00f138a22e16b1d2c:a9b16c8e758bb0f12f971bcc4fb8ab9302b82d0112c4fcb5096aa667519379ff
PMTiles is a map representation with geometry that depends on zoom level. Use the export tool or authority source for analysis with source geometry. The source identity is listed under Technical details.
Dataset fields
id15IdID15 area
Source administrative ID15 identifier. Repeated on separate polygon fragments; it is not a cross-year identifier.
catchmentIdCoastal catchment
Coastal catchment for this edition. Unassigned polygons retain a missing catchment identifier.
effortRatioIndicative 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.
retentionRatioNitrogen retention
Modelled nitrogen retention, stored as a ratio. Unavailable throughout 2019.
retentionClassRelative retention class
Classes 1–5 relative within the catchment, not fixed national percentage intervals.
catchmentEffortHaIndicative catchment effort
Indicative hectare total for the whole catchment in 2020–2026. Do not sum across polygons. Omitted in 2019.
applicationIndicatedApplication indicated in this edition
Historical application indication in the annual source, not current eligibility advice.
mappedAreaHaSource 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.