# Features ## GET /collections/{collectionId}/items > Retrieve features in the feature collection ```json {"openapi":"3.0.1","info":{"title":"OS NGD API – Features","version":"v1.8.0"},"tags":[{"name":"Features","description":"Retrieve features"}],"servers":[{"url":"https://api.os.uk/features/ngd/ofa/v1"}],"security":[{"api-key":[],"api-key-header":[],"oauth2":[]}],"components":{"securitySchemes":{"api-key":{"type":"apiKey","name":"key","in":"query"}},"schemas":{"FeatureCollectionResponse":{"type":"object","properties":{"type":{"type":"string"},"links":{"type":"array","items":{"$ref":"#/components/schemas/Link"}},"timeStamp":{"type":"string","format":"date-time"},"features":{"type":"array","items":{"$ref":"#/components/schemas/Feature"}}}},"Link":{"type":"object","properties":{"href":{"type":"string","format":"url"},"rel":{"type":"string"},"type":{"type":"string"},"title":{"type":"string"}}},"Feature":{"type":"object","properties":{"id":{"type":"string"},"type":{"type":"string"},"geometry":{"$ref":"#/components/schemas/Geometry"},"properties":{"type":"object","additionalProperties":{"type":"object"}}}},"Geometry":{"type":"object","properties":{"type":{"type":"string"},"coordinates":{"type":"array","items":{"$ref":"#/components/schemas/Coordinate"}}}},"Coordinate":{"type":"object","properties":{"x":{"type":"number","format":"double"},"y":{"type":"number","format":"double"}}}}},"paths":{"/collections/{collectionId}/items":{"get":{"tags":["Features"],"summary":"Retrieve features in the feature collection","operationId":"getItems","parameters":[{"name":"collectionId","in":"path","description":"A known collection ID.","required":true,"schema":{"type":"string","enum":["asu-gbpcd-postcodeunitarea-1","asu-gbpcd-postcodeunitpoint-1","bld-fts-building-1","bld-fts-building-2","bld-fts-building-3","bld-fts-building-4","bld-fts-buildingaccesslocation-1","bld-fts-buildingline-1","bld-fts-buildingpart-1","bld-fts-buildingpart-2","gnm-fts-crowdsourcednamepoint-1","gnm-fts-namedarea-1","gnm-fts-namedpoint-1","gnm-fts-namedroadjunction-1","lnd-fts-land-1","lnd-fts-land-2","lnd-fts-land-3","lnd-fts-landform-1","lnd-fts-landformline-1","lnd-fts-landformpoint-1","lnd-fts-landpoint-1","lus-fts-site-1","lus-fts-site-2","lus-fts-siteaccesslocation-1","lus-fts-siteaccesslocation-2","lus-fts-siteroutingpoint-1","str-fts-compoundstructure-1","str-fts-compoundstructure-2","str-fts-compoundstructure-3","str-fts-fieldboundary-1","str-fts-structure-1","str-fts-structure-2","str-fts-structure-3","str-fts-structureline-1","str-fts-structurepoint-1","trn-fts-cartographicraildetail-1","trn-fts-rail-1","trn-fts-rail-2","trn-fts-rail-3","trn-fts-roadline-1","trn-fts-roadtrackorpath-1","trn-fts-roadtrackorpath-2","trn-fts-roadtrackorpath-3","trn-fts-streetlight-1","trn-ntwk-buslane-1","trn-ntwk-connectinglink-1","trn-ntwk-connectingnode-1","trn-ntwk-cyclelane-1","trn-ntwk-ferrylink-1","trn-ntwk-ferrynode-1","trn-ntwk-ferryterminal-1","trn-ntwk-path-1","trn-ntwk-pathlink-1","trn-ntwk-pathlink-2","trn-ntwk-pathlink-3","trn-ntwk-pathnode-1","trn-ntwk-pavementlink-1","trn-ntwk-railwaylink-1","trn-ntwk-railwaylinkset-1","trn-ntwk-railwaynode-1","trn-ntwk-road-1","trn-ntwk-roadjunction-1","trn-ntwk-roadlink-1","trn-ntwk-roadlink-2","trn-ntwk-roadlink-3","trn-ntwk-roadlink-4","trn-ntwk-roadlink-5","trn-ntwk-roadnode-1","trn-ntwk-street-1","trn-ntwk-tramonroad-1","trn-rami-averageandindicativespeed-1","trn-rami-highwaydedication-1","trn-rami-maintenancearea-1","trn-rami-maintenanceline-1","trn-rami-maintenancepoint-1","trn-rami-reinstatementarea-1","trn-rami-reinstatementline-1","trn-rami-reinstatementpoint-1","trn-rami-restriction-1","trn-rami-routinghazard-1","trn-rami-routingstructure-1","trn-rami-specialdesignationarea-1","trn-rami-specialdesignationline-1","trn-rami-specialdesignationpoint-1","wtr-fts-intertidalline-1","wtr-fts-tidalboundary-1","wtr-fts-water-1","wtr-fts-water-2","wtr-fts-water-3","wtr-fts-waterpoint-1","wtr-ntwk-waterlink-1","wtr-ntwk-waterlink-2","wtr-ntwk-waterlinkset-1","wtr-ntwk-waternode-1"]}},{"name":"bbox","in":"query","description":"The optional bbox parameter specifies a supported bounding box. Only features that have a geometry that intersects the bounding box are selected. The bounding box is provided as four comma-separated numbers: The default coordinate reference system of the values is WGS 84 longitude/latitude (http://www.opengis.net/def/crs/OGC/1.3/CRS84) unless a different coordinate reference system is specified in the parameter `bbox-crs`.","style":"form","explode":false,"schema":{"maxItems":6,"minItems":4,"type":"array","items":{"type":"number"}}},{"name":"bbox-crs","in":"query","description":"The coordinate reference system of the `bbox` parameter. It must be a 2D coordinate reference system supported by the collection. Default is WGS84 longitude/latitude (http://www.opengis.net/def/crs/OGC/1.3/CRS84).","schema":{"type":"string","enum":["http://www.opengis.net/def/crs/OGC/1.3/CRS84","http://www.opengis.net/def/crs/EPSG/0/27700","http://www.opengis.net/def/crs/EPSG/0/4326","http://www.opengis.net/def/crs/EPSG/0/3857"]}},{"name":"crs","in":"query","description":"The coordinate reference system of the response geometries. It must be a coordinate reference system supported by the collection. Default is WGS84 longitude/latitude (http://www.opengis.net/def/crs/OGC/1.3/CRS84).","schema":{"type":"string","enum":["http://www.opengis.net/def/crs/OGC/1.3/CRS84","http://www.opengis.net/def/crs/EPSG/0/27700","http://www.opengis.net/def/crs/EPSG/0/4326","http://www.opengis.net/def/crs/EPSG/0/3857","http://www.opengis.net/def/crs/EPSG/0/7405"]}},{"name":"datetime","in":"query","description":"Either a local date, a date-time with UTC time zone (Z) or an open or closed interval. Open ranges in time intervals at the start or end are supported using a double-dot (..) or an empty string for the start/end. Date and time expressions adhere to RFC 3339. Examples:Selects features that have a temporal property that intersects the value of the parameter.","style":"form","schema":{"type":"string"}},{"name":"limit","in":"query","description":"The optional limit parameter limits the number of items that are presented in the response document. Minimum = 1. Maximum = 100. Default = 100.","style":"form","schema":{"maximum":100,"minimum":1,"type":"integer"}},{"name":"offset","in":"query","description":"The optional offset parameter skips past the specified number of features in the collection. Minimum = 0. Default = 0.","schema":{"minimum":0,"type":"integer"}},{"name":"filter","in":"query","description":"The optional filter parameter is a filter expression in CQL format which is applied when retrieving resources to determine which resources are included in a result set.","schema":{"type":"string"}},{"name":"filter-crs","in":"query","description":"Specify which of the supported CRSs to use to encode geometric values in a filter expression. It must be a 2D coordinate reference system supported by the collection. Default is WGS84 longitude/latitude (http://www.opengis.net/def/crs/OGC/1.3/CRS84).","schema":{"type":"string","enum":["http://www.opengis.net/def/crs/OGC/1.3/CRS84","http://www.opengis.net/def/crs/EPSG/0/27700","http://www.opengis.net/def/crs/EPSG/0/4326","http://www.opengis.net/def/crs/EPSG/0/3857"]}},{"name":"filter-lang","in":"query","description":"The optional filter-lang parameter is the specific language used for the filter parameter. Default = cql-text","schema":{"type":"string","enum":["cql-text"]}}],"responses":{"200":{"description":"A list of features in a feature collection.","content":{"application/geo+json":{"schema":{"$ref":"#/components/schemas/FeatureCollectionResponse"}}}},"400":{"description":"The items request is not supported. Please refer to documentation for examples."},"404":{"description":"Collection '{collectionId}' is not a supported Collection. Please refer to the documentation for a list of supported Collections."},"405":{"description":"The HTTP method requested is not supported. This endpoint only supports 'GET' requests."},"406":{"description":"A request header value was not supported."},"504":{"description":"The request has timed out. Please check the service availability dashboard: https://osdatahub.os.uk/serviceStatus ."}}}}}} ```