spatial.addPointLayerHilbert

Procedure

Adds a new simple point layer with hilbert curve based index, returns the layer root node

Signature

spatial.addPointLayerHilbert(name :: STRING, indexConfig =  :: STRING) :: (node :: NODE)

Input parameters

Name Type Default Description

name

STRING

null

The name of the layer

indexConfig

STRING

""

The configuration of the newly created index

Output parameters

Name Type Description

node

NODE

Examples

Create a layer to index a node

CALL spatial.addPointLayerHilbert('my-simple-hilbert-layer')
Table 1. Result
node 
(:SpatialLayer {
    geomencoder: "org.neo4j.gis.spatial.encoders.SimplePointEncoder",
    index_class: "org.neo4j.gis.spatial.index.LayerHilbertPointIndex",
    layer: "my-simple-hilbert-layer",
    layer_class: "org.neo4j.gis.spatial.SimplePointLayer",
    layercrs: "GEOGCS[\"WGS84(DD)\", \n  DATUM[\"WGS84\", \n    SPHEROID[\"WGS84\", 6378137.0, 298.257223563]], \n  PRIMEM[\"Greenwich\", 0.0], \n  UNIT[\"degree\", 0.017453292519943295], \n  AXIS[\"Geodetic longitude\", EAST], \n  AXIS[\"Geodetic latitude\", NORTH], \n  AUTHORITY[\"EPSG\",\"4326\"]]"
})

Create a node to index

CREATE (n:Node {id: 42, latitude:60.1,longitude:15.2}) SET n.location=point(n) RETURN n

Index node

MATCH (n:Node) WITH n CALL spatial.addNode('my-simple-hilbert-layer',n) YIELD node RETURN node
Table 2. Result
node 
(:SpatialIndex_hilbert_my-simple-hilbert-layer:Node {
    _spatialindex_hilbert_my-simple-hilbert-layer: 9664325,
    bbox: [ 15.2, 60.1, 15.2, 60.1 ],
    gtype: 1,
    id: 42,
    latitude: 60.1,
    location: point({x: 15.2, y: 60.1, crs: 'wgs-84'}),
    longitude: 15.2
})

Find node within distance

CALL spatial.withinDistance('my-simple-hilbert-layer',{lon:15.0,lat:60.0},100)
Table 3. Result
distance node 
15.713441434310283
 
(:SpatialIndex_hilbert_my-simple-hilbert-layer:Node {
    _spatialindex_hilbert_my-simple-hilbert-layer: 9664325,
    bbox: [ 15.2, 60.1, 15.2, 60.1 ],
    gtype: 1,
    id: 42,
    latitude: 60.1,
    location: point({x: 15.2, y: 60.1, crs: 'wgs-84'}),
    longitude: 15.2
})