@prefix dcat: . @prefix dct: . @prefix foaf: . @prefix prov: . @prefix rdfs: . @prefix skos: . @prefix spdx: . @prefix vcard: . @prefix xsd: . a dct:Location . a skos:Concept ; skos:prefLabel "Environment"@en . a skos:Concept ; skos:prefLabel "Transport"@en . a dct:MediaTypeOrExtent . a dct:MediaTypeOrExtent . a dct:MediaTypeOrExtent . a dct:MediaTypeOrExtent . a dct:MediaTypeOrExtent . a dct:Frequency . a dct:MediaType . a dct:MediaType . a dct:MediaType . a dct:MediaType . a dct:MediaType . a dct:Standard . a dcat:Dataset ; dct:description "The WFS layers Meluselvitys_2022_Helsinki_*_LAeq_7-22_NPM and _22-7_NPM of the city map service (streets and roads, railway, metro, tram), as GeoJSON. Read weekly (pipelines noise-roads-day-0…2, noise-roads-night-0…2 and noise-rail)." ; dct:title "City of Helsinki noise survey" . a dct:Standard . a dcat:Distribution ; dct:description """OGC API - Features, read-only: Part 1 (Core: collections and items), Part 2 (coordinate reference systems by reference) and Part 3 (Filtering with CQL2). https://api.dev.joinedcontext.com/api/endpoint/dh54wtluwvyhzmdsaosg3xpmgdadyoxg/ogc/features/conformance lists the classes this endpoint serves. In QGIS: Layer, Add Layer, Add WFS / OGC API - Features Layer, a new connection with the URL https://api.dev.joinedcontext.com/api/endpoint/dh54wtluwvyhzmdsaosg3xpmgdadyoxg/ogc/features/. With curl: curl 'https://api.dev.joinedcontext.com/api/endpoint/dh54wtluwvyhzmdsaosg3xpmgdadyoxg/ogc/features/collections' Always live: the catalogue holds this link, never a copy. Open to anyone, with no sign-in. The fields it filters on and example queries that answered with this dataset's data: https://api.dev.joinedcontext.com/d/dh54wtluwvyhzmdsaosg3xpmgdadyoxg""" ; dct:format ; dct:issued "2026-10-27T01:33:51.565594"^^xsd:dateTime ; dct:license ; dct:modified "2026-10-27T13:39:34.899157"^^xsd:dateTime ; dct:rights [ a dct:RightsStatement ; rdfs:label "Source: City of Helsinki, CC BY 4.0" ] ; dct:title "OGC API - Features" ; dcat:accessService [ a dcat:DataService ; dct:conformsTo ; dct:title "OGC API - Features" ; dcat:endpointURL ; dcat:servesDataset ] ; dcat:accessURL ; dcat:mediaType . a dcat:Distribution ; dct:description "The data model as OWL; sha256 63c76b64b5832141ab79400aa00d7a83028db0b764f39cf098cb0bf8e2010c7d." ; dct:format ; dct:issued "2026-10-27T01:33:51.565594"^^xsd:dateTime ; dct:license ; dct:modified "2026-10-27T13:39:34.899611"^^xsd:dateTime ; dct:rights [ a dct:RightsStatement ; rdfs:label "Source: City of Helsinki, CC BY 4.0" ] ; dct:title "helsinki model.owl.ttl" ; spdx:checksum [ a spdx:Checksum ; spdx:algorithm spdx:checksumAlgorithm_sha256 ; spdx:checksumValue "63c76b64b5832141ab79400aa00d7a83028db0b764f39cf098cb0bf8e2010c7d"^^xsd:hexBinary ] ; dcat:accessURL ; dcat:byteSize "2785"^^xsd:nonNegativeInteger ; dcat:mediaType . a dcat:Distribution ; dct:description """Live updates: open one WebSocket, subscribe to the entities you want, and each change arrives as a message, with no server of your own. With websocat, then type the subscription: websocat --protocol ngsi-ld-ws 'wss://api.dev.joinedcontext.com/api/endpoint/dh54wtluwvyhzmdsaosg3xpmgdadyoxg/ws' {"metadata":{"x-op":"x-subscribe","x-id":"s1"},"body":{"type":"Subscription","entities":[{"type":"NoiseZone"}]}} Always live: the catalogue holds this link, never a copy. Open to anyone, with no sign-in. The message format, the limits and examples in JavaScript and Python: https://dev.joinedcontext.com/docs/API/07-websocket""" ; dct:issued "2026-10-27T01:33:51.565594"^^xsd:dateTime ; dct:license ; dct:modified "2026-10-27T13:39:34.899097"^^xsd:dateTime ; dct:rights [ a dct:RightsStatement ; rdfs:label "Source: City of Helsinki, CC BY 4.0" ] ; dct:title "Live updates over WebSocket" ; dcat:accessURL ; dcat:mediaType . a dcat:Distribution ; dct:description """The NGSI-LD API (ETSI GS CIM 009) of this dataset: query, filter and page its entities. The first ten NoiseZone entities: curl -H 'Accept: application/ld+json' 'https://api.dev.joinedcontext.com/api/endpoint/dh54wtluwvyhzmdsaosg3xpmgdadyoxg/ngsi-ld/v1/entities?type=NoiseZone&limit=10' Always live: the catalogue holds this link, never a copy. Open to anyone, with no sign-in. The fields it filters on and example queries that answered with this dataset's data: https://api.dev.joinedcontext.com/d/dh54wtluwvyhzmdsaosg3xpmgdadyoxg""" ; dct:format ; dct:issued "2026-10-27T01:33:51.565594"^^xsd:dateTime ; dct:license ; dct:modified "2026-10-27T13:39:34.898943"^^xsd:dateTime ; dct:rights [ a dct:RightsStatement ; rdfs:label "Source: City of Helsinki, CC BY 4.0" ] ; dct:title "NGSI-LD API" ; dcat:accessService [ a dcat:DataService ; dct:conformsTo ; dct:title "NGSI-LD API" ; dcat:endpointURL ; dcat:servesDataset ] ; dcat:accessURL ; dcat:mediaType . a dcat:Distribution ; dct:description "The data model as LinkML; sha256 35ae890ee156d3008e9b7b1bb053b59d943b056129f8075fcaac46da405511f1." ; dct:format ; dct:issued "2026-10-27T01:33:51.565594"^^xsd:dateTime ; dct:license ; dct:modified "2026-10-27T13:39:34.899503"^^xsd:dateTime ; dct:rights [ a dct:RightsStatement ; rdfs:label "Source: City of Helsinki, CC BY 4.0" ] ; dct:title "helsinki model.linkml.yaml" ; spdx:checksum [ a spdx:Checksum ; spdx:algorithm spdx:checksumAlgorithm_sha256 ; spdx:checksumValue "35ae890ee156d3008e9b7b1bb053b59d943b056129f8075fcaac46da405511f1"^^xsd:hexBinary ] ; dcat:accessURL ; dcat:byteSize "7696"^^xsd:nonNegativeInteger ; dcat:mediaType . a dcat:Distribution ; dct:description """A CSV table, generated on each download from the endpoint's live data. curl -o file.csv 'https://api.dev.joinedcontext.com/api/endpoint/dh54wtluwvyhzmdsaosg3xpmgdadyoxg/file.csv' Open to anyone, with no sign-in.""" ; dct:format ; dct:issued "2026-10-27T01:33:51.565594"^^xsd:dateTime ; dct:license ; dct:modified "2026-10-27T13:39:34.899033"^^xsd:dateTime ; dct:rights [ a dct:RightsStatement ; rdfs:label "Source: City of Helsinki, CC BY 4.0" ] ; dct:title "CSV" ; dcat:accessURL ; dcat:mediaType . a dcat:Distribution ; dct:description """OData v4, read-only: each entity type is an entity set, with $filter, $select, $orderby and $top. In Excel: Data, Get Data, From Other Sources, From OData Feed, then the URL https://api.dev.joinedcontext.com/api/endpoint/dh54wtluwvyhzmdsaosg3xpmgdadyoxg/odata/v4/. In Power BI: Get data, OData feed, the same URL. With curl: curl 'https://api.dev.joinedcontext.com/api/endpoint/dh54wtluwvyhzmdsaosg3xpmgdadyoxg/odata/v4/' Its entity sets: https://api.dev.joinedcontext.com/api/endpoint/dh54wtluwvyhzmdsaosg3xpmgdadyoxg/odata/v4/NoiseZone. Always live: the catalogue holds this link, never a copy. Open to anyone, with no sign-in. The fields it filters on and example queries that answered with this dataset's data: https://api.dev.joinedcontext.com/d/dh54wtluwvyhzmdsaosg3xpmgdadyoxg""" ; dct:issued "2026-10-27T01:33:51.565594"^^xsd:dateTime ; dct:license ; dct:modified "2026-10-27T13:39:34.899214"^^xsd:dateTime ; dct:rights [ a dct:RightsStatement ; rdfs:label "Source: City of Helsinki, CC BY 4.0" ] ; dct:title "OData v4" ; dcat:accessURL ; dcat:mediaType . a dcat:Distribution ; dct:description "The data model as Markdown; sha256 2067800efb2a6e667dec6a4544c93529d4cd9a6fff91183dd611f4554cfcaf43." ; dct:format ; dct:issued "2026-10-27T01:33:51.565594"^^xsd:dateTime ; dct:license ; dct:modified "2026-10-27T13:39:34.899557"^^xsd:dateTime ; dct:rights [ a dct:RightsStatement ; rdfs:label "Source: City of Helsinki, CC BY 4.0" ] ; dct:title "helsinki model.md" ; spdx:checksum [ a spdx:Checksum ; spdx:algorithm spdx:checksumAlgorithm_sha256 ; spdx:checksumValue "2067800efb2a6e667dec6a4544c93529d4cd9a6fff91183dd611f4554cfcaf43"^^xsd:hexBinary ] ; dcat:accessURL ; dcat:byteSize "2081"^^xsd:nonNegativeInteger ; dcat:mediaType . a dcat:Distribution ; dct:description "The data model as JSON-LD; sha256 5adfbaeb54f835e4653cc3bbaedaa576589d2146bf746a285c33d4d4a4288b8f." ; dct:format ; dct:issued "2026-10-27T01:33:51.565594"^^xsd:dateTime ; dct:license ; dct:modified "2026-10-27T13:39:34.899449"^^xsd:dateTime ; dct:rights [ a dct:RightsStatement ; rdfs:label "Source: City of Helsinki, CC BY 4.0" ] ; dct:title "helsinki context.jsonld" ; spdx:checksum [ a spdx:Checksum ; spdx:algorithm spdx:checksumAlgorithm_sha256 ; spdx:checksumValue "5adfbaeb54f835e4653cc3bbaedaa576589d2146bf746a285c33d4d4a4288b8f"^^xsd:hexBinary ] ; dcat:accessURL ; dcat:byteSize "995"^^xsd:nonNegativeInteger ; dcat:mediaType . a dcat:Distribution ; dct:description "The data model as JSON Schema; sha256 1557055e038c0bf3130c5f5f9592330f3dfe554be00330757d4f5bccaa1d61a4." ; dct:format ; dct:issued "2026-10-27T01:33:51.565594"^^xsd:dateTime ; dct:license ; dct:modified "2026-10-27T13:39:34.899728"^^xsd:dateTime ; dct:rights [ a dct:RightsStatement ; rdfs:label "Source: City of Helsinki, CC BY 4.0" ] ; dct:title "helsinki model.schema.json" ; spdx:checksum [ a spdx:Checksum ; spdx:algorithm spdx:checksumAlgorithm_sha256 ; spdx:checksumValue "1557055e038c0bf3130c5f5f9592330f3dfe554be00330757d4f5bccaa1d61a4"^^xsd:hexBinary ] ; dcat:accessURL ; dcat:byteSize "2765"^^xsd:nonNegativeInteger ; dcat:mediaType . a dcat:Distribution ; dct:description """For AI assistants: a Model Context Protocol server over this dataset's endpoint https://api.dev.joinedcontext.com/api/endpoint/dh54wtluwvyhzmdsaosg3xpmgdadyoxg. It answers anyone, with no sign-in, what the endpoint serves the public. Tools: `query_entities` (the rows of an entity type, with an NGSI-LD `q` filter, `attrs`, `count` and paging), `get_entity` (one entity by its URN), `describe_schema` (the data model: read it first) and `describe_access` (what you may read). Licence: Creative Commons Attribution 4.0; the data is reused under it. An MCP client reaches it with this configuration: {"mcpServers":{"helsinki-noise":{"type":"http","url":"https://api.dev.joinedcontext.com/api/endpoint/dh54wtluwvyhzmdsaosg3xpmgdadyoxg/mcp"}}} """ ; dct:format ; dct:issued "2026-10-27T01:33:51.565594"^^xsd:dateTime ; dct:license ; dct:modified "2026-10-27T13:39:34.899289"^^xsd:dateTime ; dct:rights [ a dct:RightsStatement ; rdfs:label "Source: City of Helsinki, CC BY 4.0" ] ; dct:title "Model Context Protocol" ; dcat:accessService [ a dcat:DataService ; dct:conformsTo ; dct:title "Model Context Protocol" ; dcat:endpointURL ; dcat:servesDataset ] ; dcat:accessURL ; dcat:mediaType . a dcat:Distribution ; dct:description "The data model as RDF; sha256 048d2447531e62dc1c5e4c06e7e04d1999291545659a83a537d8d85cda408019." ; dct:format ; dct:issued "2026-10-27T01:33:51.565594"^^xsd:dateTime ; dct:license ; dct:modified "2026-10-27T13:39:34.899673"^^xsd:dateTime ; dct:rights [ a dct:RightsStatement ; rdfs:label "Source: City of Helsinki, CC BY 4.0" ] ; dct:title "helsinki model.rdf.ttl" ; spdx:checksum [ a spdx:Checksum ; spdx:algorithm spdx:checksumAlgorithm_sha256 ; spdx:checksumValue "048d2447531e62dc1c5e4c06e7e04d1999291545659a83a537d8d85cda408019"^^xsd:hexBinary ] ; dcat:accessURL ; dcat:byteSize "1344"^^xsd:nonNegativeInteger ; dcat:mediaType . a dcat:Distribution ; dct:description "The data model in every formalism, for every model version, each artifact with its sha256 (EP-68)." ; dct:format ; dct:issued "2026-10-27T01:33:51.565594"^^xsd:dateTime ; dct:license ; dct:modified "2026-10-27T13:39:34.899343"^^xsd:dateTime ; dct:rights [ a dct:RightsStatement ; rdfs:label "Source: City of Helsinki, CC BY 4.0" ] ; dct:title "Schema artifacts" ; dcat:accessURL ; dcat:mediaType . a dcat:Distribution ; dct:description "The Endpoint's own DCAT-AP 3.0 description, which this dataset is published from (EP-63)." ; dct:format ; dct:issued "2026-10-27T01:33:51.565594"^^xsd:dateTime ; dct:license ; dct:modified "2026-10-27T13:39:34.899394"^^xsd:dateTime ; dct:rights [ a dct:RightsStatement ; rdfs:label "Source: City of Helsinki, CC BY 4.0" ] ; dct:title "DCAT-AP record" ; dcat:accessURL ; dcat:mediaType . a dcat:Distribution ; dct:description "The data model as SHACL; sha256 6cd50263b6218d008d9c57c4dd750dd670a74822ef6437a918b2a53632503b37." ; dct:format ; dct:issued "2026-10-27T01:33:51.565594"^^xsd:dateTime ; dct:license ; dct:modified "2026-10-27T13:39:34.899782"^^xsd:dateTime ; dct:rights [ a dct:RightsStatement ; rdfs:label "Source: City of Helsinki, CC BY 4.0" ] ; dct:title "helsinki model.shacl.ttl" ; spdx:checksum [ a spdx:Checksum ; spdx:algorithm spdx:checksumAlgorithm_sha256 ; spdx:checksumValue "6cd50263b6218d008d9c57c4dd750dd670a74822ef6437a918b2a53632503b37"^^xsd:hexBinary ] ; dcat:accessURL ; dcat:byteSize "4177"^^xsd:nonNegativeInteger ; dcat:mediaType . a dct:Standard . a foaf:Agent ; foaf:name "City of Helsinki" . a dct:Standard . a dct:MediaTypeOrExtent . a dct:MediaType . a foaf:Document . a rdfs:Resource . a rdfs:Resource . a rdfs:Resource . a dct:MediaTypeOrExtent . a dct:MediaTypeOrExtent . a dct:MediaType . a dcat:Dataset ; dct:accrualPeriodicity ; dct:conformsTo ; dct:description "The computed noise areas of Helsinki's 2022 noise survey as 5 dB bands: streets and roads, the railway, the metro and the tram (noiseSource), for the day 07-22 and the night 22-07 (assessmentPeriod, LAeq). The band's lower and upper bound in decibels are noiseLevelLow and noiseLevelHigh; the loudest band has no upper bound. noiseSource is a custom property beside the Smart Data Model extension NoiseZone. Source: City of Helsinki, CC BY 4.0." ; dct:identifier "dh54wtluwvyhzmdsaosg3xpmgdadyoxg" ; dct:issued "2026-10-27T01:33:51.565594"^^xsd:dateTime ; dct:modified "2026-10-27T13:39:34.891860"^^xsd:dateTime ; dct:publisher ; dct:source ; dct:spatial ; dct:title "Traffic noise zones of the 2022 noise survey — Helsinki" ; dcat:contactPoint [ a vcard:Kind, vcard:Organization ; vcard:fn "joinedcontext" ; vcard:hasEmail ] ; dcat:distribution , , , , , , , , , , , , , , ; dcat:keyword "buller", "bullerområden", "bullerutredning", "environment", "liikennemelu", "melu", "melualueet", "meluselvitys", "miljö", "noise", "noise survey", "noise zones", "traffic noise", "trafikbuller", "ympäristö" ; dcat:landingPage ; dcat:theme , ; prov:wasGeneratedBy [ a prov:Activity ; rdfs:label "pipeline noise-rail" ] . a dct:MediaType . spdx:checksumAlgorithm_sha256 a spdx:ChecksumAlgorithm . a dct:LicenseDocument .