{"id":"d2fbda89-bdae-431c-94ac-80f445784109","type":"DATASET","name":"National Seagrass Layer (England)","slug":"national-seagrass-layer-england","description":"Overview Natural England and the Environment Agency have collaborated to produce a seagrass layer for English waters, which aims to provide a comprehensive geospatial dataset of surveys of both current and historical spatial seagrass. The layer also identifies a current seagrass extent, using the and most recent available evidence. The National Seagrass Layer is comprised of datasets collected or commissioned by Natural England and the Environment Agency, collected by Defra and associated bodies/agencies, or provided by third parties that have allowed their data to be republished under the Open Government Licence (OGL). Details of these third parties can be found in the accompanying metadata file. Caveats There are two genera of seagrass present in English waters: Ruppia sp. and Zostera sp. Commonly the use of ‘seagrass’ only refers to Zostera sp. (also known as Eelgrass). However, this dataset includes both Ruppia sp. and Zostera sp. If using the layer file, Ruppia sp. are identified by differing symbology. In the raw attribute data, Ruppia sp. and Zostera sp. can be distinguished using the EUNIS codes in the HAB_TYPE field. Seagrass data is only available where and when surveys have been carried out. Therefore, absence of seagrass in a specific year does not necessarily indicate that seagrass was not present, it may simply mean that no survey was completed that year. Similarly, there may be locations where seagrass is present, but has not been surveyed, and therefore is not represented in this dataset, such as the Medway Estuary. The seagrass layer only includes polygon data. There may be additional seagrass habitats which only have point data available, these are not included in the seagrass layer. Identified polygon extents may be affected by survey method. For example, a walking survey may not collect data below a certain depth, and a DDV survey from a boat may not collect data above a certain depth. A survey method field is included in the data, to.","free_access_class":"FREE_NO_AUTH","auth_type":"NONE","homepage_url":null,"docs_url":null,"repo_url":"https://environment.data.gov.uk/api/file/download?fileDataSetId=d5dd149b-7dad-4818-8d87-e61a58f210dd&fileName=National+Seagrass+Layer+%28England%29+-+All+Years+-+Subtidal+Seagrass.lyrx","status":"ACTIVE","verification_state":"VERIFIED","tags":["geospatial"],"logo_url":"https://www.google.com/s2/favicons?sz=64&domain=environment.data.gov.uk","primary_source_url":"https://environment.data.gov.uk/api/file/download?fileDataSetId=d5dd149b-7dad-4818-8d87-e61a58f210dd&fileName=National+Seagrass+Layer+%28England%29+-+All+Years+-+Subtidal+Seagrass.lyrx","extraction_confidence":"0.16","created_at":"2026-06-29T11:53:31.657Z","updated_at":"2026-08-16T04:26:29.316Z","last_verified_at":"2026-08-15T10:02:58.685Z","deprecated_at":null,"ranking_score":56,"last_ranked_at":"2026-08-08T06:54:57.842Z","last_seen_at":null,"last_validated_at":null,"last_uptime_at":null,"search_vector":"'a':452B,462B,479B,638B,726B,734B,738B,742B,749B,752B,762B,766B,849B 'above':748B 'absenc':198B,408B,426B 'absence':634B,845B,863B 'accompani':107B 'accompanying':543B 'addit':262B 'additional':698B 'affect':284B,432B 'affected':720B,869B 'agenc':11B,71B,349B,371B 'agency':447B,507B,786B,808B 'aim':23B 'aims':459B 'allow':85B 'allowed':521B 'also':41B,136B,477B,572B 'and':444B,471B,485B,504B,511B,559B,583B,605B,626B,675B,737B,771B,783B,810B,813B,829B,864B 'are':548B,593B,708B 'area':414B,851B 'as':574B,684B 'associ':76B,374B 'associated':512B,811B 'attribut':165B 'attribute':601B 'avail':52B,188B,270B,359B 'available':488B,624B,706B,796B 'be':525B,539B,609B,664B,697B,719B,868B 'been':630B,673B 'below':733B 'boat':307B,743B 'bodi':375B 'bodies':812B 'bodies/agencies':77B,513B 'both':469B,580B,825B 'but':670B 'by':501B,509B,516B,595B,721B,780B,803B,833B,870B 'can':538B,608B,867B 'carri':195B 'carried':631B 'caveat':110B 'caveats':546B 'certain':299B,314B,735B,750B 'code':178B,402B 'codes':614B,839B 'collabor':13B 'collaborated':449B 'collect':62B,72B,295B,310B,363B,731B,746B 'collected':498B,508B,800B 'commiss':64B,365B 'commissioned':500B,802B 'common':126B 'commonly':562B 'compil':361B 'compiling':798B 'complet':222B 'completed':658B 'comprehens':27B,330B 'comprehensive':463B,767B 'compris':59B 'comprised':495B 'contain':404B 'contains':841B 'cover':387B 'coverag':422B 'coverage':859B 'covers':824B 'current':34B,44B,333B,352B,470B,480B,770B,789B 'data':87B,166B,185B,258B,269B,296B,311B,324B,362B,407B,523B,602B,621B,694B,705B,732B,747B,760B,799B,844B 'dataset':29B,61B,142B,246B,327B,465B,578B,682B,764B 'datasets':497B 'ddv':303B,739B 'defra':74B,372B,510B,809B 'depth':300B,315B,736B,751B 'detail':97B 'details':533B 'differ':160B 'differing':596B 'distinguish':174B,395B 'distinguishable':832B 'distinguished':610B 'does':641B 'eelgrass':139B,391B,575B,828B 'england':4A,7B,67B,345B,368B,440A,443B,503B,782B,805B 'english':20B,119B,339B,456B,555B,776B 'environ':10B,70B,348B,370B 'environment':446B,506B,785B,807B 'estuari':251B 'estuary':687B 'euni':177B,399B 'eunis':613B,836B 'evid':53B,360B 'evidence':489B,797B 'exampl':289B 'example':725B 'extent':46B,281B,354B,429B,482B,791B 'extents':717B,866B 'field':183B,319B,619B,755B 'file':109B,154B,545B,590B 'for':455B,724B 'found':104B,540B 'from':741B 'genera':114B,550B 'geospati':28B,326B,436C 'geospatial':464B,763B 'given':413B,850B 'govern':94B,383B 'government':530B,820B 'hab':181B,400B,617B,837B 'habitat':264B 'habitats':700B 'has':671B 'have':448B,520B,629B,703B 'histor':36B,335B 'historical':472B,772B 'howev':140B 'however':576B 'identifi':42B,158B,279B,351B 'identified':594B,715B 'identifies':478B,788B 'if':586B 'in':541B,554B,598B,615B,637B,680B,711B,758B,775B,848B 'includ':143B,256B,274B,321B 'included':710B,757B 'includes':579B,692B 'indic':208B 'indicate':644B 'is':494B,622B,668B,677B,756B 'it':650B,787B,840B 'joint':342B 'jointly':779B 'known':137B,573B 'lack':419B,856B 'layer':3A,18B,40B,57B,153B,254B,278B,386B,439A,454B,476B,493B,589B,690B,714B,823B 'licenc':95B,384B 'licence':531B,821B 'locat':229B 'locations':665B 'map':428B 'mapped':865B 'may':215B,227B,260B,282B,293B,308B,417B,651B,663B,696B,718B,729B,744B,854B 'mean':217B,653B 'medway':250B,686B 'metadata':108B,544B 'method':287B,318B,435B,723B,754B,872B 'most':486B,794B 'nation':1A,55B 'national':437A,491B 'natur':6B,66B,344B,367B 'natural':442B,502B,781B,804B 'necessarili':207B 'necessarily':643B 'no':655B 'not':642B,648B,672B,678B,709B,730B,745B 'of':466B,468B,496B,534B,551B,565B,635B,769B,846B,857B 'ogl':96B,532B 'only':567B,623B,691B,702B,842B 'open':93B,382B,529B,819B 'or':499B,514B,801B,835B,852B 'out':632B 'overview':5B,441B 'parti':82B,101B,378B 'parties':518B,537B,815B 'point':268B,704B 'polygon':257B,280B,406B,693B,716B,843B 'present':117B,213B,233B,553B,649B,669B 'produc':15B,341B 'produce':451B 'produced':778B 'provid':25B,79B,328B 'provide':461B 'provided':515B 'providing':765B 'publish':379B 'publishing':816B 'rather':423B,860B 'raw':164B,600B 'recent':51B,358B,487B,795B 'record':331B,768B 'refer':132B 'refers':568B 'reflect':418B,855B 'repres':243B 'represented':679B 'republish':90B 'republished':526B 'ruppia':121B,145B,155B,167B,393B,557B,581B,591B,603B,830B 'seagrass':2A,17B,38B,45B,56B,116B,130B,184B,200B,210B,231B,253B,263B,277B,336B,353B,410B,438A,453B,474B,481B,492B,552B,566B,620B,636B,646B,667B,689B,699B,713B,773B,790B,847B 'similar':225B 'similarly':661B 'simpli':216B 'simply':652B 'sp':122B,125B,135B,146B,149B,156B,168B,171B,390B,394B,558B,561B,571B,582B,585B,592B,604B,607B,827B,831B 'spatial':37B,473B 'specif':203B 'specific':639B 'such':683B 'survey':31B,192B,220B,238B,286B,292B,304B,317B,337B,421B,434B,656B,722B,728B,740B,753B,858B,871B 'surveyed':674B 'surveys':467B,628B,774B 'symbolog':161B,397B 'symbology':597B,834B 'than':861B 'that':519B,645B,654B,659B 'the':445B,475B,484B,490B,505B,528B,542B,563B,588B,599B,612B,616B,685B,688B,712B,759B,784B,793B,806B,818B,822B 'their':522B 'there':547B,662B,695B 'therefor':197B,240B 'therefore':633B,676B 'these':535B,707B 'third':81B,100B,377B,517B,536B,814B 'this':577B,681B 'to':450B,460B,524B,569B,761B 'true':425B,862B 'two':113B,549B 'type':182B,401B,618B,838B 'under':527B,817B 'use':47B,128B,151B,175B,355B,564B 'using':483B,587B,611B,792B 'walk':291B 'walking':727B 'was':647B,657B 'water':21B,120B,340B 'waters':457B,556B,777B 'when':627B 'where':625B,666B 'which':458B,701B 'year':204B,224B,416B,640B,660B,853B 'zostera':124B,134B,148B,170B,389B,560B,570B,584B,606B,826B","popularity_score":"0.0000","maintenance_score":"0.7000","institution_id":"1f2ccc0c-101e-481a-9b9a-953589dc80ae","institution_type":"AGENCY","country_code":"GB","official_confidence":null,"proof_summary":null,"source_seed_url":null,"is_public_sector":true,"published_at":"2026-06-30T10:37:48.447Z","geographic_scope":"NATIONAL","name_en":null,"description_en":"A geospatial dataset providing a comprehensive record of current and historical seagrass surveys in English waters, produced jointly by Natural England and the Environment Agency. It identifies current seagrass extent using the most recent available evidence, compiling data collected or commissioned by Natural England, the Environment Agency, Defra and associated bodies, and third parties publishing under the Open Government Licence. The layer covers both Zostera sp. (eelgrass) and Ruppia sp., distinguishable by symbology or EUNIS HAB_TYPE codes. It contains only polygon data; absence of seagrass in a given area or year may reflect lack of survey coverage rather than true absence, and mapped extents can be affected by survey method.","native_lang":"en","access_level":"direct","formats":[],"capability_tier":"reference","trust_score":45.83333333333333,"access":{"level":"direct","primary":{"kind":"query","label":"Run verified request","method":"GET","url":"https://environment.data.gov.uk/api/file/download?fileDataSetId=d5dd149b-7dad-4818-8d87-e61a58f210dd&fileName=National+Seagrass+Layer+%28England%29+-+All+Years+-+Subtidal+Seagrass.lyrx","source":"probe","runnable":true},"actions":[{"kind":"query","label":"Run verified request","method":"GET","url":"https://environment.data.gov.uk/api/file/download?fileDataSetId=d5dd149b-7dad-4818-8d87-e61a58f210dd&fileName=National+Seagrass+Layer+%28England%29+-+All+Years+-+Subtidal+Seagrass.lyrx","source":"probe","runnable":true}],"formats":[]},"maturity":{"entry_id":"d2fbda89-bdae-431c-94ac-80f445784109","granularity":"entry","granularity_label":"One unit = one catalog entry. A PROXY for the SCOPE.md §4 ladder, which governs source families, not entries: a family with 400 entries moves this reading 400 times as much as a family with one. Never compare or combine with the source_family reading.","level":"verified","level_index":2,"level_label":"Verified","meaning":"Access tested successfully","counts_as_coverage":false,"blocked_by":null,"rungs":[{"level":"discovered","level_index":1,"label":"Discovered","meaning":"Source and metadata recorded","evidence":"membership of the named population the ladder is taken over","counts_as_coverage":false,"met":true,"reached":true,"criterion":"TRUE"},{"level":"verified","level_index":2,"label":"Verified","meaning":"Access tested successfully","evidence":"entries.verification_state = 'VERIFIED'","counts_as_coverage":false,"met":true,"reached":true,"criterion":"entries.verification_state = 'VERIFIED'"},{"level":"profiled","level_index":3,"label":"Profiled","meaning":"Schema, dimensions and licence understood","evidence":"a data profile with at least one field (entry_data_profiles.field_count > 0)","counts_as_coverage":false,"met":false,"reached":false,"criterion":"EXISTS (SELECT 1 FROM entry_data_profiles p WHERE p.entry_id = entries.id AND COALESCE(p.field_count, 0) > 0)"},{"level":"executable","level_index":4,"label":"Executable","meaning":"Queries run through Commodity","evidence":"entries.capability_tier = 'live' — today's proxy for \"queryable through us\"","counts_as_coverage":true,"met":false,"reached":false,"criterion":"entries.capability_tier = 'live'"},{"level":"joinable","level_index":5,"label":"Joinable","meaning":"Canonical identifiers and concepts mapped","evidence":"a field link to a canonical identifier whose sampled VALUES match its format","counts_as_coverage":true,"met":false,"reached":false,"criterion":"EXISTS (SELECT 1 FROM entry_field_links efl WHERE efl.entry_id = entries.id AND efl.identifier_id IS NOT NULL AND efl.value_status = 'match')"},{"level":"reproducible","level_index":6,"label":"Reproducible","meaning":"Snapshots and transformation evidence retained","evidence":"at least one retained evidence manifest (migration 078)","counts_as_coverage":true,"met":false,"reached":false,"criterion":"EXISTS (SELECT 1 FROM evidence_manifests em WHERE em.entry_id = entries.id)"},{"level":"guaranteed","level_index":7,"label":"Guaranteed","meaning":"Monitored against an operational reliability target","evidence":"an active reliability target with a named monitor (migration 096)","counts_as_coverage":true,"met":false,"reached":false,"criterion":"EXISTS (SELECT 1 FROM entry_reliability_targets rt WHERE rt.entry_id = entries.id AND rt.is_active = true)"}],"officialness":{"basis":"catalog_inherited","label":"Inherited from the upstream catalog: this item came from a trusted official government catalog, and that provenance — not per-item proof — is the warrant. Its own proof score is below 80 or it matched no registered institution (apps/worker/src/connectors/catalog/qualify-store.ts).","proof_confidence":null,"proven_threshold":80,"institution_id":"1f2ccc0c-101e-481a-9b9a-953589dc80ae","definition":"CASE WHEN COALESCE(entries.is_public_sector, false) IS NOT TRUE THEN 'not_official' WHEN COALESCE(entries.official_confidence, 0) >= 80 AND entries.institution_id IS NOT NULL THEN 'per_item_proven' ELSE 'catalog_inherited' END"},"source_family":{"key":"environment.data.gov.uk","label":"One unit = one source family, approximated by the serving host of the entry's primary source URL (e.g. bdl.stat.gov.pl). A COMPUTED stand-in for the curated families of SCOPE.md §5, which no table holds yet. A family sits at the highest level any of its entries has reached, because a family is integrated to the depth of its deepest working integration. Never compare or combine with the entry reading."},"generated_at":"2026-08-16T13:50:28.964Z"},"api_details":null,"dataset_details":null,"license":null,"reuse":{"license_id":null,"license_name":null,"license_url":null,"commercial_use":{"status":"unknown","value":null},"redistribution":{"status":"unknown","value":null},"attribution_required":{"status":"unknown","value":null},"share_alike":{"status":"unknown","value":null},"personal_data_warning":{"status":"unknown","value":null},"cache_and_mirror":{"status":"unknown","value":null},"undetermined":["commercial_use","redistribution","attribution_required","share_alike","personal_data_warning","cache_and_mirror"],"basis":"unverified","confidence":0.1,"confidence_tier":"low","source_text":null,"source_url":null,"reviewed_at":null},"license_raw":null,"latest_check":{"id":"f7ead584-d75b-4fc1-9010-8bf5f82881a0","entry_id":"d2fbda89-bdae-431c-94ac-80f445784109","status":"VERIFIED","last_checked_at":"2026-08-16T04:26:29.145Z","p50_latency_ms":5512,"p95_latency_ms":null,"last_error":"Distribution check failed (no response)","consecutive_failures":1,"created_at":"2026-06-29T11:53:36.516Z","updated_at":"2026-08-16T04:26:29.145Z","consecutive_successes":0,"probe_url":"https://environment.data.gov.uk/api/file/download?fileDataSetId=d5dd149b-7dad-4818-8d87-e61a58f210dd&fileName=National+Seagrass+Layer+%28England%29+-+All+Years+-+Subtidal+Seagrass.lyrx","probe_method":"GET","probe_http_status":200,"probe_content_type":"application/octet-stream","probe_succeeded_at":"2026-08-15T10:02:58.386Z"},"data_profile":{"id":"3c3668fc-29f3-4847-b20c-67611411e2fd","entry_id":"d2fbda89-bdae-431c-94ac-80f445784109","profile_source":"none","profile_kind":"dataset","dataset_id":null,"fields":null,"field_count":null,"sample_records":null,"record_count":null,"data_size_bytes":null,"dataset_count":null,"query_examples":null,"status":"unsupported","error_message":"No introspectable source detected (primary URL sniffed: not machine-readable data)","profiled_at":"2026-07-20T13:21:03.370Z","run_id":"6f5a8a6d-f804-44a5-9613-080bbc25a923","created_at":"2026-07-20T13:21:03.370Z","updated_at":"2026-07-20T13:21:03.370Z","license_raw":null,"license_id":null,"consecutive_failure_count":0,"last_error_at":null,"last_error_message":null,"previewable":false},"datasets":[],"limits":[]}