Indsatsbehov i målrettet kvælstofregulering / Targeted nitrogen regulation effort need
2019–2026 · OpenLandData · Processing note, 2026-09-15

DA
Den originale årlige ZIP indeholder et shapefile i EPSG:25832. Kildepolygonerne
er administrative områder, ikke marker eller bedrifter. ID15 gentages på
separate polygonfragmenter og er ikke en entydig polygonidentifikator.

Kildens felter:
IndsatsPCT: vejledende indsatsbehov i procent. ID15-niveau i 2019; oplandsniveau
i 2020–2026. Den verificerede 2020-vejledning bruger efterafgrødegrundarealet
fra 2019. En tilsvarende referenceårgang er ikke verificeret for de øvrige år.
IndsatsHA: vejledende hektartotal for oplandet i 2020–2026. Må ikke summeres
over polygonerne. Betydningen i 2019 er uafklaret; værdien vises ikke på kortet.
ID15: administrativ identifikator; tal til og med 2023, tekst fra 2024.
Kystopland: årgangens oplandsidentifikator. Manglende tildeling bevares.
Retention: modelleret kvælstofretention i procent; mangler i hele 2019.
Ret_klasse: klasse 1–5 relativt inden for oplandet; lavest til højest retention.
Kan_soges: Ja/ja/Nej er en historisk kildeangivelse, ikke aktuel støttevejledning.

Ældre DBF-tal kræver særlig afkodning. Eksempler: 66,2.0000000000 betyder 66,2;
63157,7.0000000000 betyder 63157,7; ,42.0000000000 betyder 0,42. Almindelige
shapefile-læsere kan returnere manglende værdier for disse tokens. OpenLandData
afkoder kun dette kontrollerede mønster i IndsatsHA (2019–2021 og 2023) og
Retention (2020–2022). Ukendte mønstre afvises. Tomme/stjernefyldte felter
forbliver manglende. UTF-8 gælder til 2023; ISO 88591 fra 2024.

Kortets procenttal lagres som forholdstal: 34,5% er 0,345. Polygonareal beregnes
separat i EPSG:25832. Oplandets hektartotal fordeles ikke på polygonerne.
Kommunernes CSV er en beregnet arealfordeling efter faste indsatsintervaller,
inklusive manglende, modstridende og udækkede arealer. Hele DAGI-kommunegrænsen
er nævner, inklusive eventuelt vand. Det er ikke et kommunalt reguleringskrav.
Overlap i samme interval tælles én gang. Overlap mellem forskellige intervaller
vises som modstridende. Beregninger sker før geometriforenkling i EPSG:25832.

EN
The original annual ZIP contains a shapefile in EPSG:25832. Polygons are
administrative areas, not agricultural fields or farms. Repeated ID15 values
identify separate polygon fragments, so ID15 is not a unique polygon ID.

Source fields:
IndsatsPCT: indicative effort percentage. ID15-level in 2019; catchment-level
in 2020–2026. The verified 2020 guide uses the 2019 catch-crop base area.
An equivalent denominator reference year has not been verified for other years.
IndsatsHA: indicative catchment hectare total in 2020–2026. Do not sum across
polygons. The 2019 meaning remains unresolved; that value is omitted publicly.
ID15: administrative identifier; numeric through 2023, text from 2024.
Kystopland: catchment identifier for that edition. Missing assignments remain missing.
Retention: modelled nitrogen retention percentage; absent throughout 2019.
Ret_klasse: classes 1–5, relative within the catchment, from lowest to highest retention.
Kan_soges: Ja/ja/Nej means Yes/Yes/No in the historical source, not current eligibility.

Older DBF numbers require explicit decoding. Examples: 66,2.0000000000 -> 66.2;
63157,7.0000000000 -> 63157.7; ,42.0000000000 -> 0.42. Standard shapefile readers
can return null for these tokens. OpenLandData decodes only this reviewed pattern
in IndsatsHA (2019–2021 and 2023) and Retention (2020–2022). Unknown patterns fail.
Blank/star-filled fields stay null. Encoding is UTF-8 through 2023, ISO 88591 from 2024.

Map percentages are stored as ratios: 34.5% is 0.345. Polygon area is calculated
separately in EPSG:25832. Catchment hectare totals are not apportioned to polygons.
The municipality CSV contains derived area composition by fixed effort band,
including missing, conflicting and uncovered areas. Its denominator is the full
DAGI municipality boundary, including water. It is not a municipal regulatory
requirement. Same-band overlap counts once; different-band overlap is reported
as conflict. Calculations use EPSG:25832 before display simplification.

Sources / Kilder
Effort: Landbrugsstyrelsen / SGAV, CC0 1.0.
https://landbrugsgeodata.fvm.dk/
https://creativecommons.org/publicdomain/zero/1.0/
Exact-series CC0 evidence, also used for older editions without separate annual records:
https://geodata-info.dk/srv/dan/catalog.search#/metadata/64daa751-400a-4eec-92a9-4ba42ac1578a
Municipality boundaries: DAGI, Klimadatastyrelsen / Agency for Climate Data, CC BY 4.0.
https://www.klimadatastyrelsen.dk/
https://creativecommons.org/licenses/by/4.0/
Reference: dagi-2026-07-15-bdc1dd8348863fff.
Boundary SHA-256: bdc1dd8348863fff1c65d9366e6e2a1335c9e8c4f445fcfc0679e0eee0c274cb.
Calculations / Beregning: OpenLandData. Annual CSV rows identify edition and release.

The map does not show measured nitrogen pollution, actual catch-crop establishment
or farm compliance. Boundaries and rules can change between years. No annual
differences or automatic cross-year identities are calculated. Consult the annual
official guidance for rules and calculations.