spatial.addPointLayerGeohash

Procedure

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

Signature

spatial.addPointLayerGeohash(name :: STRING, crsName = wgs84 :: STRING, indexConfig =  :: STRING) :: (node :: NODE)

Input parameters

Name Type Default Description

name

STRING

null

The name of the layer

crsName

STRING

"wgs84"

The CRS to be used, valid values are: wgs84

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.addPointLayerGeohash('my-simple-geohash-layer')
Table 1. Result
node 
(:SpatialLayer {
    geomencoder: "org.neo4j.gis.spatial.encoders.SimplePointEncoder",
    index_class: "org.neo4j.gis.spatial.index.LayerGeohashPointIndex",
    layer: "my-simple-geohash-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-geohash-layer',n) YIELD node RETURN node
Table 2. Result
node 
(:SpatialIndex_geohash_my-simple-geohash-layer:Node {
    _spatialindex_geohash_my-simple-geohash-layer: "1110001001100110011110101101011110001011101011010001000100011101",
    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-geohash-layer',{lon:15.0,lat:60.0},100)
Table 3. Result
distance node 
15.713441434310283
 
(:SpatialIndex_geohash_my-simple-geohash-layer:Node {
    _spatialindex_geohash_my-simple-geohash-layer: "1110001001100110011110101101011110001011101011010001000100011101",
    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
})