{ "name": "Topo-Feature", "abstract": "Features with 2 or 3D geometry defined via generalised topology between identified objects (Features).", "description": "Defines Feature (object) topology using a _topology_ property containing an ordered list of references to other features. \\n\\nOther features may be either features with topology properties or GeoJSON (or FG-JSON) geometry properties.\\n\\nTopo-Feature defined objects can be solids, swept volumes or any other concept. \\n\\nTopo-Feature allows for general topology to be described between independent features (objects) with any geometry dimensions. \\n\\nTopo-Feature-Collections define a self-contained set of such objects with referential integrity (all elements are present to fully define geometry coordinates.\\n\\nNote: This is a generalisation of the TopoJSON concept using inline, nested arrays of coordinates - but not limited to self-contained geometries per feature, duplicated between topologically related features..\n\nUsing JSON-FG allows for explicit CRS.\n\nSupports transformation \"smoke tests\" from 2 and 3D topology to simple geojson views.\n\nIf desired coordinate compaction transformations could be defined as per TopoJSON functionality, using specialised CRS definition._\n", "modified": "2026-08-11T07:24:17.134947", "tooling": { "bblocks-postprocess": { "commitId": "\"989dc6251d43604afdfd4b503bdbd417e88a5876", "shortCommitId": "\"989dc6", "date": "2026-08-06T10:55:48+00:00\"" } }, "gitRepository": "https://github.com/ogcincubator/topo-feature", "gitHubRepository": "https://github.com/ogcincubator/topo-feature/blob/master/", "baseURL": "https://ogcincubator.github.io/topo-feature/", "viewerURL": "https://ogcincubator.github.io/topo-feature/", "validationReport": "https://ogcincubator.github.io/topo-feature/build/tests/report.html", "validationReportJson": "https://ogcincubator.github.io/topo-feature/build/tests/report.json", "imports": [ "https://opengeospatial.github.io/bblocks/register.json" ], "bblocks": [ { "itemIdentifier": "ogc.geo.topo.alignments.cityjson-transform", "name": "CityJSON to TopoFeature transform", "highlighted": true, "abstract": "Demonstration of a transform from CityJSON to TopoFeature", "status": "under-development", "dateTimeAddition": "2024-10-18T08:31:00Z", "itemClass": "schema", "register": "ogc", "version": "0.1", "dateOfLastChange": "2024-10-18", "tags": [ "3D", "geometry", "topology", "cityjson" ], "shaclShapes": {}, "sourceFiles": "https://ogcincubator.github.io/topo-feature/_sources/alignments/cityjson-transform/", "validationPassed": true, "testOutputs": "https://github.com/ogcincubator/topo-feature/blob/master/build/tests/geo/topo/alignments/cityjson-transform/", "transforms": [ { "id": "topo-feature", "description": "Transforms CityJSON geometries and vertices to GeoJSON / TopoFeature features.", "type": "jq", "ref": "https://ogcincubator.github.io/topo-feature/_sources/alignments/cityjson-transform/transforms/topo-feature.jq", "code": "# CityJSON -> topoFeature type mapping\n# (note: Surface is used as an auxiliary type)\ndef toTopoGeometry: {\n \"MultiSurface\": \"MultiPolygon\",\n \"CompositeSurface\": \"MultiPolygon\",\n \"Solid\": \"Polyhedron\",\n \"MultiSolid\": \"MultiPolyhedron\",\n \"CompositeSolid\": \"MultiPolyhedron\",\n} as $MAP | ($MAP[.] // .);\n\n# CityJSON geometry array contents mapping\n# (note: Surface is used as an auxiliary type)\ndef nextGeometry: {\n \"MultiPolyhedron\": \"Polyhedron\",\n \"Polyhedron\": \"MultiPolygon\",\n \"MultiPolygon\": \"Polygon\",\n \"Polygon\": \"LineString\"\n} as $MAP | $MAP[.];\n\n# Accepts object with \"references\" (to inner geometries or vertices), \"type\", and optional \"id\"\ndef processBoundaries: .type as $TYPE | .id as $ID | (.type | toTopoGeometry) as $TOPO_TYPE | ($TOPO_TYPE | nextGeometry) as $NEXT_TYPE | {\n \"@type\": \"Feature\",\n \"@id\": ($ID // empty),\n \"geometry\": null,\n \"topology\": {\n \"type\": $TOPO_TYPE,\n \"references\": (if (.type == \"MultiPoint\" or .type == \"LineString\") then (.references | map(\"#vertices-\\(.)\")) else (.references | to_entries | map({\n \"type\": $NEXT_TYPE,\n \"id\": (if $ID then \"\\($ID)_\\(.key + 1)\" else empty end),\n \"references\": .value\n } | processBoundaries)) end)\n },\n \"properties\": null\n};\n\n.CityObjects |= [\n to_entries | .[]\n | .value.parents |= if . then map(\"#:city-objects-\\(.)\") else empty end\n | { \"@id\": \"#city-objects-\\(.key | @uri)\", \"dct:identifier\": .key } + .value\n | .\"@id\" as $OBJECT_ID\n | .geometry |= if . then ([ .[] |\n .type as $GEOM_TYPE | .boundaries as $BOUNDARIES | (try (.semantics.values | to_entries) catch []) as $INDEXES\n | {\n \"surfaces\": (if .semantics.surfaces\n then [.semantics.surfaces | to_entries | .[] | .key as $IDX\n | .value + {\n \"@type\": (if .type then [$GEOM_TYPE, .type] else $GEOM_TYPE end),\n \"boundaries\": ({\"type\": $GEOM_TYPE, \"id\": \"\\($OBJECT_ID)_geom_\\($IDX)\", \"references\": [$BOUNDARIES | .[$INDEXES | map(if .value == $IDX then .key else empty end) | .[]]]} | processBoundaries)\n }]\n else [{\"@type\": $GEOM_TYPE, \"boundaries\": ({\"type\": $GEOM_TYPE, \"id\": \"\\($OBJECT_ID)_geom_0\", \"references\": $BOUNDARIES} | processBoundaries)}]\n end),\n \"lod\": \"\\(.lod)\"\n }\n ]) else empty end\n]\n| . + {\n \"@id\": \"#city\"\n}\n|\ndef to_coords: if . then { \"city:x\": .[0], \"city:y\": .[1], \"city:z\": .[2] } else empty end ;\n(.transform.scale |= to_coords) | (.transform.translate |= to_coords)\n | .metadata.geographicalExtent |= if . then {\n \"city:min\": .[0:3] | to_coords,\n \"city:max\": .[3:6] | to_coords\n } else empty end\n | .vertices |= [to_entries | .[] | {\n \"@id\": \"#vertices-\\(.key | @uri)\",\n \"type\": \"Feature\",\n \"geometry\": {\n \"@type\": \"Point\",\n \"geojson:coordinates\": .value\n },\n \"properties\": (.value | to_coords),\n }]", "inputs": { "mediaTypes": [ { "id": "json", "defaultExtension": "json", "label": "JSON", "mimeType": "application/json", "extensions": [ "json" ] } ] }, "outputs": { "mediaTypes": [ { "id": "json", "defaultExtension": "json", "label": "JSON", "mimeType": "application/json", "extensions": [ "json" ] } ] } }, { "id": "topo-feature-semantic-uplift", "description": "Transforms CityJSON geometries and vertices to GeoJSON / TopoFeature features, and then to a custom RDF model.", "type": "semantic-uplift", "ref": "https://ogcincubator.github.io/topo-feature/_sources/alignments/cityjson-transform/transforms/topo-feature-uplift.yml", "code": "transform:\n # Assign fragment ids to City Objects and format geometries (semantics surfaces/values)\n - |\n \n # CityJSON -> topoFeature type mapping\n # (note: Surface is used as an auxiliary type)\n def toTopoGeometry: {\n \"MultiSurface\": \"MultiPolygon\",\n \"CompositeSurface\": \"MultiPolygon\",\n \"Solid\": \"Polyhedron\",\n \"MultiSolid\": \"MultiPolyhedron\",\n \"CompositeSolid\": \"MultiPolyhedron\",\n } as $MAP | ($MAP[.] // .);\n\n # CityJSON geometry array contents mapping\n # (note: Surface is used as an auxiliary type)\n def nextGeometry: {\n \"MultiPolyhedron\": \"Polyhedron\",\n \"Polyhedron\": \"MultiPolygon\",\n \"MultiPolygon\": \"Polygon\",\n \"Polygon\": \"LineString\"\n } as $MAP | $MAP[.];\n\n # Accepts object with \"references\" (to inner geometries or vertices), \"type\", and optional \"id\"\n def processBoundaries: .type as $TYPE | .id as $ID | (.type | toTopoGeometry) as $TOPO_TYPE | ($TOPO_TYPE | nextGeometry) as $NEXT_TYPE | {\n \"@type\": \"Feature\",\n \"@id\": ($ID // empty),\n \"geometry\": null,\n \"topology\": {\n \"type\": $TOPO_TYPE,\n \"references\": (if (.type == \"MultiPoint\" or .type == \"LineString\") then (.references | map(\"#vertices-\\(.)\")) else (.references | to_entries | map({\n \"type\": $NEXT_TYPE,\n \"id\": (if $ID then \"\\($ID)_\\(.key + 1)\" else empty end),\n \"references\": .value\n } | processBoundaries)) end)\n },\n \"properties\": null\n };\n\n .CityObjects |= [\n to_entries | .[]\n | .value.parents |= if . then map(\"#:city-objects-\\(.)\") else empty end\n | { \"@id\": \"#city-objects-\\(.key | @uri)\", \"dct:identifier\": .key } + .value\n | .\"@id\" as $OBJECT_ID\n | .geometry |= if . then ([ .[] |\n .type as $GEOM_TYPE | .boundaries as $BOUNDARIES | (try (.semantics.values | to_entries) catch []) as $INDEXES\n | {\n \"surfaces\": (if .semantics.surfaces\n then [.semantics.surfaces | to_entries | .[] | .key as $IDX\n | .value + {\n \"@type\": (if .type then [$GEOM_TYPE, .type] else $GEOM_TYPE end),\n \"boundaries\": ({\"type\": $GEOM_TYPE, \"id\": \"\\($OBJECT_ID)_geom_\\($IDX)\", \"references\": [$BOUNDARIES | .[$INDEXES | map(if .value == $IDX then .key else empty end) | .[]]]} | processBoundaries)\n }]\n else [{\"@type\": $GEOM_TYPE, \"boundaries\": ({\"type\": $GEOM_TYPE, \"id\": \"\\($OBJECT_ID)_geom_0\", \"references\": $BOUNDARIES} | processBoundaries)}]\n end),\n \"lod\": \"\\(.lod)\"\n }\n ]) else empty end\n ]\n | . + {\n \"@id\": \"#city\"\n }\n # Format coordinates and assign fragment ids to vertices\n - |\n def to_coords: if . then { \"city:x\": .[0], \"city:y\": .[1], \"city:z\": .[2] } else empty end ;\n (.transform.scale |= to_coords) | (.transform.translate |= to_coords)\n | .metadata.geographicalExtent |= if . then { \n \"city:min\": .[0:3] | to_coords,\n \"city:max\": .[3:6] | to_coords\n } else empty end\n | .vertices |= [to_entries | .[] | { \n \"@id\": \"#vertices-\\(.key | @uri)\",\n \"type\": \"Feature\",\n \"geometry\": {\n \"@type\": \"Point\",\n \"geojson:coordinates\": .value\n },\n \"properties\": (.value | to_coords), \n }]\n\ncontext:\n $:\n '@version': 1.1\n '@base': https://example.com/city-topo-feature\n c: https://example.com/city-topo-feature#\n\n city: http://example.com/vocab/city/\n attr: http://example.com/vocab/city/attr#\n dct: http://purl.org/dc/terms/\n xsd: http://www.w3.org/2001/XMLSchema#\n gml: http://www.opengis.net/ont/gml#\n geojson: https://purl.org/geojson/vocab#\n\n CityJSON: city:City\n\n type: '@type'\n id: dct:identifier\n version: city:version\n\n attributes: '@nest'\n\n CityObjects:\n '@id': city:hasObject\n '@context':\n # City Objects\n Bridge: city:Bridge\n BridgeConstructiveElement: city:BridgeConstructiveElement\n BridgeFurniture: city:BridgeFurniture\n BridgeInstallation: city:BridgeInstallation\n BridgePart: city:BridgePart\n BridgeRoom: city:BridgeRoom\n Building: city:Building\n BuildingConstructiveElement: city:BuildingConstructiveElement\n BuildingFurniture: city:BuildingFurniture\n BuildingInstallation: city:BuildingInstallation\n BuildingPart: city:BuildingPart\n BuildingRoom: city:BuildingRoom\n BuildingStorey: city:BuildingStorey\n BuildingUnit: city:BuildingUnit\n CityFurniture: city:CityFurniture\n CityObjectGroup: city:CityObjectGroup\n ExtensionObject: city:ExtensionObject\n LandUse: city:LandUse\n OtherConstruction: city:OtherConstruction\n PlantCover: city:PlantCover\n Railway: city:Railway\n Road: city:Road\n SolitaryVegetationObject: city:SolitaryVegetationObject\n TINRelief: city:TINRelief\n TransportSquare: city:TransportSquare\n Tunnel: city:Tunnel\n TunnelConstructiveElement: city:TunnelConstructiveElement\n TunnelFurniture: city:TunnelFurniture\n TunnelHollowSpace: city:TunnelHollowSpace\n TunnelInstallation: city:TunnelInstallation\n TunnelPart: city:TunnelPart\n WaterBody: city:WaterBody\n Waterway: city:Waterway\n _AbstractBuilding: city:_AbstractBuilding\n _AbstractCityObject: city:_AbstractCityObject\n _AbstractTransportationComplex: city:_AbstractTransportationComplex\n '+GenericCityObject': https://www.cityjson.org/extensions/download/generic.ext.json#GenericCityObject\n\n function: city:hasFunction\n usage: city:hasUsage\n\n Feature: geojson:Feature\n \n geometry:\n '@id': city:hasGeometry\n '@context':\n # Geometry Objects\n GeometryInstance: city:GeometryInstance\n Semantics: city:Semantics\n\n CompositeSolid: gml:CompositeSolid\n CompositeSurface: gml:CompositeSurface\n MultiLineString: gml:MultiLineString\n MultiPoint: gml:MultiPoint\n MultiSolid: gml:MultiSolid\n MultiSurface: gml:MultiSurface\n Solid: gml:Solid\n\n # Geometric primitives\n RoofSurface: city:RoofSurface\n GroundSurface: city:GroundSurface\n WallSurface: city:WallSurface\n ClosureSurface: city:ClosureSurface\n OuterCeilingSurface: city:OuterCeilingSurface\n OuterFloorSurface: city:OuterFloorSurface\n Window: city:Window\n Door: city:Door\n InteriorWallSurface: city:InteriorWallSurface\n CeilingSurface: city:CeilingSurface\n FloorSurface: city:FloorSurface\n WaterSurface: city:WaterSurface\n WaterGroundSurface: city:WaterGroundSurface\n WaterClosureSurface: city:WaterClosureSurface\n TrafficArea: city:TrafficArea\n AuxiliaryTrafficArea: city:AuxiliaryTrafficArea\n TransportationHole: city:TransportationHole\n TransportationMarking: city:TransportationMarking\n\n # Appearance Objects\n Material: city:Material\n Texture: city:Texture\n\n lod:\n '@id': city:lod\n surfaces:\n '@id': city:hasSurface\n '@context':\n '@vocab': http://example.com/vocab/city/attr#\n boundaries:\n '@id': city:boundaries\n '@container': '@list'\n '@type': '@id'\n\n # Topo-feature\n topology:\n '@type': '@id'\n '@id': geojson:topology\n '@context':\n references:\n '@id': geojson:relatedFeatures\n '@type': '@id'\n '@container': '@list'\n GeometryCollection: geojson:GeometryCollection\n LineString: geojson:LineString\n MultiLineString: geojson:MultiLineString\n MultiPoint: geojson:MultiPoint\n MultiPolygon: geojson:MultiPolygon\n Point: geojson:Point\n Polygon: geojson:Polygon\n Polyhedron: geojson:Polyhedron\n MultiPolyhedron: geojson:MultiPolyhedron\n Prism:\n '@id': geojson:Prism\n '@context':\n base: geojson:prismBase\n lower: geojson:prismLower\n upper: geojson:prismUpper\n MultiPrism:\n '@id': geojson:MultiPrism\n '@context':\n prisms: geojson:prisms\n parents:\n '@id': city:hasParent\n '@type': '@id'\n children:\n '@id': city:hasChild\n '@type': '@id'\n\n 'city:x':\n '@id': city:x\n '@type': xsd:decimal\n 'city:y':\n '@id': city:y\n '@type': xsd:decimal\n 'city:z':\n '@id': city:z\n '@type': xsd:decimal\n\n transform:\n '@id': city:hasTransform\n '@context':\n scale: city:scale\n translate: city:translate\n\n metadata:\n '@id': '@nest'\n '@context':\n identifier: dct:identifier\n geographicalExtent: city:geographicalExtent\n\n vertices:\n '@id': city:hasVertex\n '@context':\n properties: '@nest'\n geometry: city:hasGeometry\n Point: geojson:Point\n\n extensions:\n '@id': city:hasExtension\n '@container': '@index'\n '@index': dct:identifier\n '@context':\n url: '@id'\n version: dct:version", "inputs": { "mediaTypes": [ { "id": "json", "defaultExtension": "json", "label": "JSON", "mimeType": "application/json", "extensions": [ "json" ] } ] }, "outputs": { "mediaTypes": [ { "id": "ttl", "defaultExtension": "ttl", 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